The Ultimate Quick Reference Guide 2nd Edition components for home constructors in 1923, shortly followed by complete receivers in 1924. He also claimed that Strattons was one of the first firms associated with the original British Broadcasting Company. My own personal view is that these claims are slightly premature. Strattons first radio-related patent was filed in February 1925, as was the Trademark Eddystone and the Lighthouse device. The companys single 1 BBC share certificate (which escaped the blitz) is dated September 1925. By the end of 1925 there were 1716 members of the BBC. The first written reference to an Eddystone receiver (that I can find) is in the Wireless World listings for spring 1926. (Eddystone Twin). It is my own belief that Stratton Laughton and his friends were involved in Wireless Mania, (as were most bright young men at the time) during 1923/4 and that towards the end of 1924 decided to produce simple components. I dont really think the first complete receivers were constructed until the end of 1925 and marketed in 1926. A fruitful area for ongoing research, I think. All contemporary evidence gratefully received by the writer! In the meantime we do know that Strattons took on board Harold Cox and Arthur Edwards (G)6XJ during this period and that these two were to provide a driving force for the next forty years. Their names crop up again and again in Eddystone history. Harold became Technical Director and Arthur became Sales Director, continuing with the firm until the late 1960s. THE SHORTWAVE REVOLUTION By 1927 short waves were well established across the world, due to the pioneering work of early radioamateurs. One of these was Gerald Marcuse, George Brown G5BJ works on a VHF Lecher Line transmitter (G6SL) in the roof-top laboratory at Strattons Balmoral Works, 1935. Signals were received in New York. 11 G2NM, who obtained a permit from the British Postmaster General to transmit speech and music to the British Empire. Power was to be 1 kW input, wavelengths 23 and 33 metres and the first transmission was on September 11th 1927. The experiment continued for almost a year. The BBC also started experimental broadcasting on 20 metres from G5SW, Chelmsford (Marconi) in November 1927. The result was a demand for shortwave receivers from expat Brits. Stratton & Co were ready to fill that need and c.1927 produced what is believed to be their first short wave set, the Atlantic Two. By 1930 the company had ceased making medium wave only sets and from then on everything was focused on the higher frequencies.

The Ultimate Quick Reference Guide 2nd Edition RAPID EXPANSION Sets were produced by the company in bewildering variety. Eddystone receivers were used by many scientific expeditions of the 1930s, such as the British Arctic Air Route Expedition and the Hudson Strait Settlement Expedition. In 1935 work started on VHF experiments and portable Eddystone five-metre equipment was used by the Hugh Ruttledge 1936 Mount Everest expedition; a world first. Strattons were to serve a purpose of national importance in this field. WAR CLOUDS FORM The London Metropolitan Police Authority covering some 95 police stations and Scotland Yard, sent an urgent request to Stratton & Co to tender for an automatic wireless telephone network. This was accepted, and work commenced day & night to complete the system for July 1939.
AFTER THE 1940 BLITZ The installation worked perfectly throughout the war. Similar equipment was supplied to many prominent police forces including Birmingham, Glasgow and Edinburgh. We are dependent on salvaged ephemera for all our information of the twenties and thirties. Virtually nothing survived the bombing of October and November 1940. J.R. & L., in conjunction with the Air Ministry (for whom they were manufacturing radar I.F.F. components) took over a disused Lido known as The Bath Tub at West Heath (sometimes referred to as Kings Norton) on the southern outskirts of the city. All that remained were two signal generators, a beat frequency audio oscillator and a Q meter! Benches and fixtures were made from timber taken from the dressing cubicles; tools were purchased from local ironmongers and within three months production had outstripped pre-
EDDYSTONE TYPE 215 VHF 100 Watt AM Tx Over 250 were supplied to the police and Admiralty during the war During the years 1935-8 much effort was made demonstrating to the police and military to gain acceptance of VHF equipment for use in cars and tanks, but without success. It was not until after 1938, when war was looming, that 12
The Ultimate Quick Reference Guide 2nd Edition blitz figures. Type 358 receivers were back in full production. All this improvisation was done under the direction of Harold Cox; Arthur Edwards had joined the Fleet Air Arm. During the rest of the war no further damage was caused and over 4.5 million components for use by H.M.Forces were manufactured. Just over 4,500 transmitters, 7,264 receivers and 45,000 other supplementary pieces of equipment were supplied, for Police, Army, Royal Air Force, but mainly Admiralty requirements. After the war ended times were difficult in the radio business. War surplus depressed world markets. A major decision, perhaps an error, was made not to re-enter the VHF two-way radio field. It was decided to concentrate on specialised communication equipment, well constructed for performance and stability and selling on these points rather than price; a policy which brought success for many years. TIMES CHANGE In 1964 the death of George Abe Laughton brought the company to a crossroads. Eddystone Radio was the odd man out in a family company that produced goods for the cosmetic market and the Woolworths trade. The family felt that the communication business had grown in complexity beyond their understanding. A decision was made to sell the radio business to one of their largest customers, Marconi, in 1965. Solid state was just starting. It was to overlap valve production by about a decade and the last valve set was manufactured in 1973. At about this time Marconi made a policy decision that their subsidiary, Eddystone Radio, should pull out of the High Street and concentrate purely on professional receivers. The H.F. receiver market was starting to shrink as competition from the Far East started to bite. The size of ships grew, requiring fewer radios. The ocean liner cabin set market vanished in the new air travel for all regime. Satellite communication became a practical reality. Around 1980 the company entered the broadcast transmitter field in partnership with the BBC. This was very successful and took things into the 90s when Eddystone and the BBC pioneered the new Digital Audio Broadcasting (DAB). END OF AN ERA In 1995 the lease on the premises at the Bath Tub expired and the company relocated on a small industrial estate in Selly Oak, within the City of Birmingham, ready to take up the digital challenge. Unfortunately the expected expansion didnt materialise (nor has it yet done so in 2002). (It finally came in 2004) The end of the cold war had seen a big drop in government orders and the increase in satellite communication further reduced the demand for professional HF receivers. Combined with an economic crash in Malaysia, where a large VHF/FM broadcast transmitter order was cancelled, this spelled the end of Eddystones ownership by Marconi, itself in a parlous state. In 1999 the firm was bought by Megahertz Communications. After three years in the doldrums Megahertz went into receivership and, as we write, the future of Eddystone Radio is very much in the balance. I have tried to date the sets as closely as I can and I have given a clue as to the current availability of many sets. This is purely a cockshy and the rather varied style of reference has no significance other than my own state of mind at the time. There is no rank difference between quite rare and rather rare! 13

BEFORE THE WAR

As has already been explained the records of Stratton & Co were destroyed in the 1940 blitz. We are therefore dependent upon collected ephemera and magazines for most of our information.
From 1932 to 1938 Stratton published five constructors manuals, four of which were entitled Eddystone Short Wave Manual and one of which was Eddystone Ultra Short Wave Guide. Copies of these are available from Dave Simmons, EUG Archivist, telephone/fax 01869 347504. Some of the products described therein were marketed as ready-made sets, some as kits, and some as pure D.I.Y. We start this section with the Indices of each of these Manuals.
Eddystone S.W. Manual Eddystone S.W. Manual No.1 1932. Contents. No.2 1935. Contents. Kilodyne Four. Kilodyne All Electric Four. Atlantic Three. The Short Wave Variable Condenser. Amateur Bands Two. Empire Two. Super Het S.W. Converter. Short Wave Adaptor. Heterodyne Wavemeter. Dynatron Frequency Meter. Seven Metre Converter. T.P.T.G. Transmitter. Crystal Controlled Transmitter. Etc. 1935 Kilodyne Four. 1935 Kilodyne All-Electric. Mains Eliminator circuits. Eddystone Crossfeed Aerial Heptode SuperHeterodyne Converter. All Wave Buzzer Excited Wavemeter. Ultra Short Wave Receiver. Ultra Short Wave Trans. Six Valve Short Wave Super-heterodyne. One Valve SW Converter. 100 Watt C.W. and Telephony Transmitter. Etc. Eddystone S.W. Manual No.3 1936. Contents. The All World Two. The Everyman Short Waver. Short Wave Aerials. 5 Valve A.C. Short Wave Superheterodyne. Self modulating Oscillator. Four Band Transmitter. 5 Valve Short Wave Battery Superhet. Ultra Short Wave Radio Telephone A Modulated Oscillator. One Valve H.F. Amplifier. Two Valve Transceiver Etc
Eddystone S.W. Manual No.4 1938. Contents. Amateurs Shortwave Two. Improved Everyman S.W. Receiver. Miniature Amateur Station. Short Wave Preselector. Absorption Wavemeter. 25 Watt Transmitter. Field Strength Indicator. Cathode Ray Oscilloscope. Key Click Eliminator. Ultra Short Wave Two. Resonance Indicator. Amateur Communication Receiver. Power Supply Unit. Etc. Eddystone Ultra Short Wave Guide 1937. Contents. The Ultra Short Wavelengths. Two Valve Transceiver. Two Valve Quench Receiver. Absorption Wavemeter. Electron Coupled Oscillator. Lecher Wires. Ultra H.F. Transmitter. Super-Regenerative Three. Six Valve SuperHeterodyne. Modulated Oscillator. Push-Pull Unity Coupled Tx. Etc.

Eddystone E.C.R. 1939 So far as I am aware, the E.C.R. was the last pre-war introduction (March 1939). The rest of that year was spent working overtime on defence orders. All pre-war Eddystone sets may be considered as extremely rare. Two or three a year come to the surface.
WARTIME MODELS S.358 series
A private venture receiver designed in 1940. Built throughout the war and supplied only to priority customers. Quantity of all types produced = c.5,000. 358/358X common, others rare. S.358: General coverage communications receiver. 7 valves, RF/FC/2IF/DET/ BFO/OP. IF 450kcs; external PSU. Ten plug-in coil-packs, 40kc/s31mc/s. Valve-check meter. Modulebased construction. Navy Type B34 (Main user).
External psus were common to all the above and could be 200-250v AC or 6 volt dynamotor or 6v battery and 175v dry battery (for S.358/1). S.214: VHF fixed station receiver, 1939. Part of wartime police duplex radio network in London (and others). Used with the high power S.215 (100W) transmitter, c.70-100mc/s. General specification and shape similar to S.450B (below).
S.450B S.450B: 1942-45. Single channel V.H.F. A.M. duplex radio-telephone receiver derived from the S.214 (above). Crystal controlled within the range 50100mc/s. I.F = 2.9mc/s. Matching receiver for the S.440B transmitter. 10 valves. Separate psu (AC or 12 volt versions). Originally used in Admiralty service (part of Type S.S147). Used as part of British Army Wireless Station No 57, of which this set was the R408. About 2,000 are believed to have been produced. As with most Eddystone sets, never be surprised to find a one off variant of any model. The Stratton assembly line was very hand-built and special requirements were easy to incorporate. No other wartime receivers are known. The 7 watt transmitter which formed part of the WS 57 station (the S.440B) was a 23
S358 Series S.358/1: As above but with lowconsumption output valve (6J5 instead of EL32, for battery operation). S.358X: As 358 but with dual-gate crystal filter. S.400: Same appearance as 358 and same line-up, but coverage 130kc/s2.2Mc/s with four coilpacks. I.F. 110kc/s. Triode output stage. S.400X: as 440 but with dual gate crystal filter. S.400B: 1943. As S440X but with product detector; and tuned audio filter (1kc/s) on AF stage (6V6G) CW only. 6 valves. Air Ministry type R1448.
The Ultimate Quick Reference Guide 2nd Edition favourite target for conversion to Two Metres in the 1950s and few will have survived in the original state. The S.450B receiver was useless to the amateur and was stripped for parts. SIXTY MEGACYCLE 15 WATT TRANSMITTER FIVE-TEN METRE 3-VALVE CONVERTER TWO VALVE PRESELECTOR 28 MEGACYCLE C.W. AND TELEPHONY TRANSMITTER COMPONENT LIST AND PRICES

POST-WAR EDDYSTONE SHORT WAVE MANUALS
There were two of these published immediately after the war; No 5 in 1946 and No 6 in 1947. The format is exactly the same as the thirties but there is one big difference. None of the sets was offered either as a kit nor ready-made. Harold Cox (Technical Director) considered them to be a waste of time and the proposed ESWM No 7 never appeared! They are both available from EUG Archives (see latest Lighthouse page 2 for current details).
Eddystone Short Wave Manual No 6 1947
Eddystone Short Wave Manual No 5 - 1946.
V.H.F. CIRCUITRY SHORT WAVE TWO BATTERY RECEIVER SINGLE VALVE V.H.F. PRESELECTOR THREE VALVE V.H.F. STRAIGHT RECEIVER 60 Mc/s CRYSTAL CONTROLLED TRANSMITTER
BAND-SPREAD ALL DRY FOUR RECEIVER V.H.FREQUENCY METER 24
VALVE BASE DATA HETERODYNE FREQUENCY METER AERIAL SYSTEMS Etc.

POST- WAR MODELS

irst of all a word about prices. In 1940 the British government introduced a new indirect tax to help pay for the War. It was called Purchase Tax and was levied on the trade price of items deemed to be consumer goods, not clothes, food, or Eddystone components. The actual rate was determined by the Chancellor of the Exchequer and varied according to the needs of the economy. After the war it was continued until 1973, and was used as an economic regulator which varied according to the luxury rating of the goods. In 1946 Strattons claimed that their Eddystone receivers were not consumer goods. The Revenue authorities begged to differ and rated them as domestic receivers. Strattons then claimed that communication receivers were not domestic receivers and left out the loudspeakers (which their first post-war cabinet had been designed to take). The tax-man ignored them. After two years of debate the Revenue finally gave in, but determined that the criterion would be the presence or absence of a BFO! The tax varied between 30% and 60% of trade price until VAT replaced PT (which started at 8% of retail price across the board, but is currently 17.5%). Secondly, a word about nomenclature. At some time in the very late thirties all Strattons radio products were given an S number. This stood for Specification (not Stratton, as has been suggested). The actual sequence of these numbers is very erratic. In general terms the numbers get greater with the passage of
time, but not always so. The allocation of these numbers is usually credited to Harold Cox, who by this time was the Technical Director of the Eddystone Radio section of Strattons, which, it must always be remembered, manufactured more powder compacts and fancy goods than radios! In the early 1960s a new system of numbering started, to run in parallel with this traditional nomenclature. It was the two-letter prefix of which the first was always E (for Eddystone) and the second was a type designator, viz: EA Amateur EB Broadcast EC Communication EM Marine EP Panadaptor (not strictly a receiver) EY Yachtsman In the late thirties a traditional dating system was incorporated into the serial numbers of Eddystone receivers. Starting from 1923, it was a simple letter per year which repeated every 26 years plus a letter per month which utilised the first twelve letters of the alphabet. The earliest sets extant, c.1926-7, to wit four Eddystone Twins and three Atlantic Twos, have no serials whatever, so I think this starting date of 1923 is wishful thinking. Serials of the 1930s dont fit this rule until 1939. In theory there was a special order to this code; up to 1948 the month came first and from 1949 the year came first. This was fine, but in practice it seems the job of punching out the serial plates was given to the newest apprentice who was never quite sure which way round he should be doing it and didnt like to ask! So there seem to be as many errors as correct codes. But with a bit of luck, using the date spread of production given within as a guide, you will probably be able to get the right answer. The exceptions seem to be these of the Type 25

Type S659 / 659B EDDYSTONE TYPE S.659: 1947-8. Tea planters set. 8 octal valves; AC mains, 1 RF; 1 IF (450kc/s) 4 bands, 520kc/s30mc/s; magic eye, noise limiter (switch at rear); built-in speaker but offered with huge baffle speaker. Very rare. S.659B: as S.659 but with built-in 6-volt vibropack instead of AC. Very rare. NOTA BENE: TUNING DIALS MADE FOR THE S.659 WERE LATER USED FOR THE MUCH MORE COMMON TYPE S.670. THIS OFTEN LEADS TO CONFUSION. SEE UNDER S.670. EDDYSTONE TYPE S.640: 1947. HF communications receiver; 1.7 31mc/s; 9 octal valves; electrical bandspread. AC mains; 1 RF; 2 IF (1,600kc/s); BFO, xtal filter, 4,000 manufactured from
Prototype Model S.Unfortunately it ran a little too warm (it was using the cabinet and mains transformer of the 640, which itself only just managed to keep cool enough). So it went back to the drawing board for a couple of years and re-appeared in 1949 as the New 680. This has caused a little confusion as factory references called this the 680/2, but it was never marketed as such. EDDYSTONE S.680 (aka S.680/2): 1949-1951. Noticeable differences from the previous photo show a deeper 27
The Ultimate Quick Reference Guide 2nd Edition cabinet and cooling louvres, together with phone jack at LHS of case. Strattons most serious post-war product yet.
Type S.670 (The Seafarers Radio) 1948-54 New Type S.680 (aka S.680/2) 15 valves (all miniatures except PSU). AC mains; 30mc/s to 480kc/s. Two RF, two IF (450kc/s), BFO, Xtal filter, pushpull output, variable selectivity, external speaker (option), noise limiter, S-meter. Available for rack mounting. Auxiliary bandspread dial gives 7 ft. 6 ins. per range. Price 85. Rare. S.680/2A: special model for NZBC with different connectors at rear. EDDYSTONE TYPE S.670; This was the first of a very successful series of broadcast receivers targeted at ships officers and first-class passengers; they became known as cabin sets. In fact, the first batches were reserved for Export Only (in common with many other luxury goods) at this time of postwar shortage of hard currency. (See also S.670A and S.670C). Strattons north-eastern agent, Alf Willings of West Hartlepool had suggested that such a market existed. Most ships power supplies were 110v DC and the only sets available for such voltages were American midgets. These had no hash filter nor did they have short-waves or arrangements for a lowinterference aerial. There would be a market for a decent general coverage set, he said, and there was. 7 miniature B8A valves + metal rectifier; AC/DC mains 110-250v. 1 RF; 1 IF (450kc/s) Push-pull output, built-in 6 speaker. 4 bands, 520kc/s-30mc/s. 1948-54. Price 37 10s. (plus P. Tax if sold inland) Common. NOTA BENE: Most S.670 sets were built using calibrated dial glasses originally made for the rare model S.659 and were so labelled. To compound the confusion the top left of the dial back-plate carried the legend MARINE RECEIVER 659/670 in the same place that the S.659 had a magic eye. Beware! They are normal S.670 sets.

Type S.680X 1951-61 EDDYSTONE TYPE S.680X: a direct successor to the Type 680/2 (above). Commonly incorrectly reported as being a Xtal filter version of the Type S.680 (almost certainly inspired by the S.358/S.358X, where it IS the difference but both S.680 & S.680X have Xtal filters, and neither have a product detector as has been previously reported). The obvious difference is the front panel, which follows the 750 with 32 ft of band-spread in place of the 7 ft 6 inches on the 680/2. The only circuit difference is in the frequency changer valve. Price ranged from 106 to 125. Production run 1,562. Common. 28
The Ultimate Quick Reference Guide 2nd Edition EDDYSTONE TYPE S.670A (1954-62), direct successor to the marine cabin receiver type 670 (above) but with several changes. New slide-rule cabinet. 6 valves plus metal rectifier. Single-ended output stage. Magic eye tuning indicator. 110-250 volts AC/DC. 1 R.F., 1 I.F. (450kc/s) Four bands: 150380kc/s; 540-1500kc/s; 5.8-30mc/s. It is also listed in company records as the Type S.883. I can find no reason for this so far! Also it is believed that the TYPE 881/1/2/3 cabin tuner was a version of this set; 750 produced. The main differences were the new-style cabinet, a built-in brute-force mains filter and two extra wavebands, now covering 150-350kc/s and 500kc/s 30mc/s. 1962-64. 400-plus manufactured. Rare Eddystone 670C/1, as above but badged as Marconi Elettra alias MIMCO 2232B 400 known to have been manufactured 1963-67. Very rare.
Eddystone S.670C/1 Badged as Marconi Elettra Eddystone Type S.670A 3,275 models were produced. It is remarkably rare for such a production run. Price 49. NB: versions of this model exist under the Marconi (MIMCO 2232A) badge. This may include some of the above production. Most examples are likely to have ended up in the shipbreakers yards. EDDYSTONE TYPE 670C The final version of this successful line of marine cabin sets. Slight circuit alterations but otherwise very similar to the 670A (above). Other versions of the 670A & 670C have been badged as MIMCO models, but details are hazy as the service information has not been found in Eddystone Archives. EDDYSTONE EM34 was also a member of the marine cabin 670C family but using the new nomenclature. Audio output was 10 watts and it is believed to have been used as a Public Address driver (i.e. ships Tannoy). It was badged as the MIMCO 3873A, (also named Elettra). 100 were known to have been manufactured in 1965. The whole 670-series was eminent over a twenty-year period and was probably the worlds most successful universal AC/DC 110-250v general coverage broadcast receiver. It is, however, probably responsible for getting the marque a poor name among those who believed these were the only sets the company built! But they were just as well constructed as the professional models costing three or four times the price and looking very similar. 29

Type S.840A 1954-61 EDDYSTONE TYPE S.840A Successor the 840 (above), built into the new type slide-rule case with 32 feet of logging scale. Exactly the same circuit and specification. Price 49. 2,000 manufactured. Quite rare (considering its production run.)
Type S.840 1953-4 EDDYSTONE TYPE S.840: Economy communications receiver suggested by Strattons agent in the British Type S.840C 1961-68 EDDYSTONE TYPE S.840C Successor to the 840A (above) built into the new31
The Ultimate Quick Reference Guide 2nd Edition 60s style cabinet. Virtually the same circuit but with the addition of a magic eye tuning indicator and linear scale device. This involved extra padding capacitors (among other things) and it was necessary to have five bands to cover the same waverange. 1961-68 Price 58 increasing to 68. 3,500 known to have been manufactured by 1965. Common. EDDYSTONE TYPE S.730 Series: A large family of professional communications receivers, based on the 680X. 15 valves; 2 R.F.; 2 I.F. (450kc/s), BFO, IF cathode follower output, variable I.F. selectivity, xtal filter, xtal calibrator, adjustable scale, noise limiter, S-meter, audio filter (for CW), fully tropicalised. Started with 730 in 1953 (prototype only made); followed by a run of 25 730/1. Then the 730/1a (1954-8; production runs of 317) for the Diplomatic Wireless Service (some of which could be dismantled for the diplomatic bag). 730/2 in 1955 (Strattons version of /1a 40 built). 730/3 in 1956 (Strattons version with switched xtal channels). 730/6; 50 built in 1959. 730/7; 1959; nothing known. 730/8; 50 built in 1959. 730/10; 1962; nothing known. THE EDDYSTONE 770 Family of VHF and UHF receivers This famous family was originally proposed after the start of the Korean War (1950-53) when the Ministry of Defence required wide coverage VHF surveillance receivers. The original specification was for a set covering 20-250Mc/s. Stratton proposed this as the S.770M, which got as far as the 1951 Radiolympia, where it is described as a double superhet. It failed to work when the tuning-gang went into self-resonance at around 200Mc/s. After much further research the following models appeared: EDDYSTONE TYPE S.770R VHF Communications receiver. 1953-63.

Eddystone Type 820 FM Tuner Supplied without case for custom mounting in HiFi console. Production run 1,000. Price 38. Medium rare. The tuning drive of all these small Eddystones is based on the famous catalogue No. 898 dial sold as a DIY item for serious constructors. ALSO badged as Mimco Type 2294A 9 produced. Four produced with xtal control for Rediffusion. EDDYSTONE TYPE S.870 Broadcast general coverage, 1956-59. Marketed for ocean liner passenger cabins and cult domestic. Universal AC/DC 110250v. 5 valves (FC-IF-DET-LF-RECT) four bands: 150-380kc/s and 540kc/s18mc/s. IF 465kc/s. Built-in speaker; brute force mains filter. Production run 3,010. Price 34 16s. Medium rare (considering the production run)
THE SMALL VALVED EDDYSTONES
In 1955 Strattons brought out their first post-war small set. In fact it was not a short-wave set but a VHF FM tuner. The BBC had decided upon using Band II wide-band FM for the new hi-fi service (after extensive tests of FM versus AM on 3 metres.) It was based on a small (11 inch wide) diecast front panel, in family style with the normal slide-rule sets of the period (which were 17 ins wide). This was followed by a variety of other sets using the same format. They were actually smaller than the famous transistor family (12 ins wide) of the 60s and 70s the EC10 and its derivatives. EDDYSTONE TYPE S.820 1955-58. Broadcast HiFi FM mono tuner. 8 valves. 87.5-100mc/s plus one pre-set LW channel (for BBC Droitwich Light Programme Tx on 1500 metres 200 34
Eddystone Type S.870 EDDYSTONE TYPE 870A 1960-66. Identical with the above model but with 5
The Ultimate Quick Reference Guide 2nd Edition wavebands, extending the short-wave coverage to 24mc/s Production run 4,050. Price 32 2s. Again, medium rare considering the production run. It is recorded that by February 1958 a total of 100 models of all varieties had been produced. (No individual records) All extremely rare. Most production for Military Intelligence.
Eddystone Type S.870A EDDYSTONE Type S.890. 1956/7 VHF radio microphone receiver for the BBC. Single band; AM/FM with wide-range Automatic Frequency Control (AFC) to cope with drift in radio mic. 70-90 Mc/s. 10 valves; RF-FC-IF-IF-LIM-DIS-AFCAF-OP-RECT. AC mains. Production run: 39 S.890/1 as above but 100-120Mc/s. Production run: 12 Both the above are extremely rare. EDDYSTONE Type S.930-Series. Very similar to the S.890 (above), used for radio-microphones and intelligencegathering (bugging).
Eddystone Type S.901 EDDYSTONE TYPE S.Radiosonde AM receiver; single band 27-28.8Mc/s. For receiving signals from high-altitude meteorological radiosonde balloons. AC mains; six valves: RF-FCIF-DET-OP-RECT. Did not proceed past the prototype stage. END OF EDDYSTONE SMALL VALVE RECEIVERS EDDYSTONE Type S.909, 1958, marine communications receiver. Designed for the Swedish Merchant Marine. Two band (1.6-4.7Mc/s) plus fixed switched crystal controlled channel on maritime distress frequency of 2182kc/s. AC/DC 110-250v. AM and MCW only. Single conversion superhet with switchable crystal gate (IF-465kc/s, bandwidth 10kc/s or 5kc/s at 20dB down). 7valves plus metal rectifier. 1 RF; 2 IF. Built-in speaker. Production run: 100.

Eddystone S.960 39

The Ultimate Quick Reference Guide 2nd Edition Twelve transistors and seven diodes. One RF stage, three IFs (465kc/s, bandbass xtal filter). The performance was inferior to its parent S.940 and after two years production it was dropped. By this time the EC10 (ibid.) had entered production and overtaken it. Production run: 150. Price c.150. Very rare. Ten transistors. Five bands: 550kc/s30Mc/s. BFO, CW audio filter, speaker, (IF = 465kc/s). 53. Production run: 6,020. Common. EDDYSTONE Type EC10 Mk II, 1967/77. As above plus S-meter, RIT (fine tuning knob) and standby switch. Production run not listed, but known to have reached 100 a week for long periods; say 10,000. Common.
THE COMPACT TRANSISTOR EDDYSTONES
After the false start (but invaluable experience) with the above two models Eddystone launched into their most successful-ever sets (in terms of sales), the EC10-series. They continued the style of the valved slide rule receivers but only 12 inches wide, with built-in 9-volt battery pack (optional mains PSU available) and speaker. They were an instant success, being very dinky and attractive. The performance was not up to that of the valved sets but they received rave notices in the radio press. The early germanium transistors depreciate in performance after the 30 or 40 years which have now passed and this has given them a worse reputation than they deserve. They DO need to be considered in this context, but are still perfectly good for AM broadcast Dxing. EDDYSTONE Type EC10, 1963/69. General coverage communications receiver. AM/CW. Battery pack or optional AC power supply.
Eddystone Type EC10 Mk II EDDYSTONE Type EC10A2-series; (previously known as Type EC10A/2). A series of marine receivers based on the EC10 but with the following differences: 13 transistors; 5 bands: 300-550kc/s; 1.5-30Mc/s, plus a fixed crystal-controlled 2182 kc/s call and distress channel. IF = 720kc/s. 12 or 24 volt operation. 600 output.
Eddystone Type EC10A2/1 Eddystone Type ECThree versions were available: EC10A2/1, bench mounting; EC10A2/2, 19 rack mounting with forward-facing speaker. EC10A2/3, 19 rack mounting
The Ultimate Quick Reference Guide 2nd Edition with extra speaker for ships intercom. 1966-77. All very rare.
Eddystone Type EC10A2/3 EDDYSTONE Type EB35, 1965/70. Broadcast general coverage AM/FM. Battery pack or optional AC mains power supply. 13 transistors, 6 bands: 150-350kc/s, 550kc/s 22mc/s, 88108Mc/s. (IFs 465 & 10.7), speaker. Later models had extra FM IF stage (making 14 transistors). Very fashionable in the Swinging Sixties: H.R.H The Prince of Wales had one fitted in his car by Webbs Radio (Strattons retail outlet). Production run 2,100 by January 1967. Price 55. Fairly common. EDDYSTONE Type EB35A. As EB35 but VHF band is 155-175Mc/s marine inshore Narrow Band FM (NBFM). Very rare.

Eddystone Type EB35 Mk II & II/S EDDYSTONE Type EB35 Mk II/S, 1970 As Mk II but with FM stereo decoder for feeding HiFi amplifier. 20 transistors. Rare. EDDYSTONE Type EB35 MK III Statesman 1976/80. AM/FM broadcast set. Same general spec as EB35 but completely new circuit using silicon transistors, FETs and ICs. Switchable Automatic Frequency Control (AFC). Rare.
Eddystone Type EB35 Mk III EDDYSTONE Type EB36, 1966/69. Broadcast receiver, 9 transistors; as EB35 but without VHF/FM band. Price 54 5s 7d. Rare. EDDYSTONE Type EB36A, 1969. Special version of EB36 intended for professional monitoring purposes primarily in world-wide news collection agencies. (Press news broadcast monitors). 41
Eddystone EB35 EDDYSTONE EB35 Mk II, 1970. Broadcast AM/FM, same as later model EB35 but re-styled case. NATO Stock Number 5820-99-523-7337 Fairly common.
Eddystone type EB36 EB36A continued; Narrow IF bandwidth with piezo-electric ceramic filter. 600 line output. Supplied with AC power unit with the option of 12 or 24 volt units or battery-pack. Very rare. EDDYSTONE Type EB36 Mk II 1970. As EB36 but new case and circuit. Very rare. EDDYSTONE Type EB37, 1971/2. As EB36. Marketed for ships cabin use and as a short wave tuner for HiFi setups (becoming fashionable round about this time.) Price 97. Rare, Eddystone EY11 later version The rally version is much more akin to the EC10 Mk II and has the look of a production model, but it has no serial plate. Facilities are similar but the frequency coverage is 150-550kc/s and 1.5-18mc/s in five bands. Probably unique (until. ) All these small transistors are fitted with the same slab battery pack which takes 6 x D cells (large; we used to call them HP2). The optional AC psu replaced this. It was the S.924, a simple zenner regulated unit with positive earth. NB The EB35 Mk III has negative earth and uses the S.924A psu. Both these units are rare. Eddystone Type EY11 prototype The early model (above) was, incredibly, an inch narrower than the rest of the small solid-staters. Its frequency coverage is 150kc/s 6Mc/s in 4 bands, with facility for Consol navigation (a form of MF hyperbolic global positioning using a stopwatch and counting the pips). It also had DF loop facilities.
Eddystone Type EB37 EDDYSTONE Type EY11, c. 1968 Yachtsmans navigational receiver. This set is a bit of an enigma, because it was originally thought that it never proceeded beyond the prototype stage, but then one appeared at a rally! 42
The Ultimate Quick Reference Guide 2nd Edition Two unusual Eddystone radios are the Noise Measuring sets made to MPT and Home Office designs and marketed under licence from the Post Office. EDDYSTONE Noise Measuring Set No 31A. 1971. Solid state VHF portable interference tracer and measurer. A PAUSE FOR THOUGHT. Although the sequence of descriptions is by no means in strict date order it does follow the years to a degree. I think we have reached a point where a review of events is appropriate. The change from thermionics to solid state took place over a decade (196273). During this period both valve techniques as well as transistor practice advanced with haste. In 1965 the parent company Stratton, itself owned by the Laughton family, sold the Eddystone part of the business to Marconi, itself part of English Electric, soon to be acquired by GEC. The most immediate effect was a review of the business side of things, culminating in a general 20% rise in prices! Apart from a new Logo there was very little obvious change in outlook except for the closure of the famous Webbs Radio, wholly owned by Stratton and not wanted by Marconi. Messrs Imhof of Oxford Street, were appointed the main London retail outlet. By the early 70s competition from the Far East was looming and the decision was made to withdraw from the High Street market and concentrate on purely professional equipment. This, again, was not an overnight change. The EB35 Mk III was still in the 1980 catalogue. So was the EC958/12, 75-transistor, 70-IC Independent Sideband supermodel in the thousands plus price range. In the 1971 catalogue the 830 valve series was next to the 1830 transistorised replacement, of virtually identical (but slightly better!) performance. Noise Measuring Set 40A Generally similar to the 31A (above) in principal but covering the frequency range 130kHz to 33MHz. Rare. As the seventies progressed through to the eighties Britain (and much of the rest of the world) was plagued with inflation, the like of which had never been experienced within these shores. This was reflected in the price of 43

PANORAMIC DISPLAY UNITS

Panoramic display units are specialised oscilloscopes intended to be used with certain Eddystone receivers (and some others) to examine the signals present within the bandwidth of the sets intermediate frequency and hence to analyse the sideband content whilst also listening to the transmission. They are more of a laboratory instrument than an aid to reception, but brief details are given for those members wishing to play with them! They were first introduced into the range c.1963 with two models; one for use with the MF/HF receiver type 830 (it would also work with the EA12), and the other for the 770R Mk II for VHF.
Panoramic receiver EPR26 Similar to the EPR 27 (above) but using the S.770R MkII receiver (later versions also used the S.770U Mk II UHF receiver with a suitable IF Converter Type 939) together with the EP17R Panoramic Display Unit. In this case the wobbulator facility was used at 5.2 and 10.7 Mc/s.
Panoramic Display Unit EP14 Frequency coverage (intermediate frequencies) 5.2 Mc/s (1 Mc/s bandwidth) and tunable 6.2-60 Mc/s. Panoramic Receiver EPR27 This consisted of the model S.830 type receiver together with a plinth Loudspeaker Unit Type S.906. Above is mounted an EP20 Panoramic Display Unit. This unit serves a dual purpose in that it can also be used as a wobbulator for visual alignment of standard IF channels of 100kc/s, 470kc/s etc. The whole equipment will provide a useful display on signals of less than 0.5V.
Panoramic Display Unit EP15 Coverage 100 kc/s (30 kc/s bandwidth) and tunable 400 to 800 kc/s. (c.1965) 53
The Ultimate Quick Reference Guide 2nd Edition frequency variable from 1.5kHz 15kHz. Price (c.1980) c.1.6k. to
MODEL EP1061B/1. Input frequency 21.4MHz. Sweep frequency variable from 20kHz to 10MHz. Price same. MODEL EP1061B/2. Input frequency 21.4MHz. Sweep frequency 20kHz to 2MHz. Also features a switch-selectable fast sweep range from 0.5 secs to 0.01 secs. Price (c.1980) c.1.8k
Panoramic Display Unit Series EP961 Introduced in the early seventies the EP961 range was the first to use solid state circuitry. Although primarily intended as ancillaries for use with standard receivers, their sensitivity is sufficiently high to allow use with direct aerial connection in many applications. Provision is made for connecting a pen recorder. Screen size 10 x 6cm with log or linear scaling. Power supply 100250V AC or 12V DC. EP961A Frequency coverage 50kHz to 800kHz. Sensitivity for 1cm deflection 10V. Resolution 200Hz. EP961B Frequency coverage 500kHz to 36.5MHz. Sensitivity for 1cm deflection 25V. Resolution 6kHz. price (1972) 1049.

As EC10 (ibid.) but with MF coverage 300-550 kc/s (to cover non-directional beacons, etc.) I.F. 720 kc/s. Produced for the Swedish Mercantile Marine. Extremely rare. Eddystone Model EC10M is another marine version badged and marketed by Marconi as the Seaguide. Very little is known of this model but it is probably much like the above. LOUDSPEAKER UNIT Cat No 935
A versatile general-purpose loudspeaker unit styled to match the later Eddystone valve sets. 3 eliptical speaker. Size 4.5 x 8.25 x 2.5. Weight 1.75 lb. c.1965-75.
Published by Graeme Wormald, G3GGL, on behalf of the Eddystone User Group. Copyright, January 2005
Printed by Stargold Ltd., Kidderminster.