KRELL INDUSTRIES,
KRS-IA PREAMPLIFIER OWNERS MANUAL

February

i, 1987
45 Connair Road Orange, CT 06477-0533, USA

KRS-IA

PREAMPLIFIER/SUPPLY

ASSIGNMENT

KRS-IA should KRSP
Preamplifier be connected Supply

Serial to: Serial

Number
Also, KRS~IA should KRSP Preamplifier be connected Power Supply Serial to: Serial Number Number

PREAMPLIFIER

Thank you for purchasing is the latest evolution and represents advances sonic quality not found cost. Two notable design phonic operation and the signal path. Please read before using the KRS-IA. very easy to understand trouble-free performance. closed warranty card.
the KRS-IA Preamplifier. The KRS-IA in KRELLs preamplifier technology is circuitry sophistication and in any other preamplifier at any features are its completely monoabsence of any capacitors in the this instruction manual completely Its installation and operation are and it will provide many years of Please be sure to return the en-
UNPACKING While unpacking the KRS-IA please inspect the units for shipping damage. If any damage is evident contact your dealer or the factory immediately. If the unit is in proper condition proceed with installation. In addition to the two preamplifier chassis and two power supply chassis you will find two short DC cables for connection between the supplies and preamps, and one allen driver to be used for removing the top cover and phono board. The purpose of these operations will be detailed below.
INSTALLATION The KRS-IA is designed to be set up with the two preamp chassis sitting on top of the two power supplies. Before proceeding with the final installation please read the Phono Section Set Up and C.D. Section Set Up portions of the manual as they involve removal of the preamp top covers. This is much easier to accomplish before the entire preamp is in place. After completing set up of the Phono and C.D. sections place the four chassis where they will be permanently. Connect the two DC cables between the eight pin connectors on the supplies and the preamps. The AC cables can now be connected between the supplies and the AC mains. You can now proceed with connection of the various source components in your system. The rear panel inputs follow, from left to right as viewed from the front, the assignment on the "Select" switch from phono to tuner, etc. Typically the top chassis is used for the left channel, the bottom one for the right channel. After the inputs are the Record Outputs. These operate in unison for routing to two inde-
Last are two sets of Main Outputs. and are provided as a convenience pendant systems.

ON INSTALLATION

Be sure the volume controls are fully counterclockwise before making connections to the KRS-IA; also, the power amplifier(s) should be off while making connections. Place all power amps, C.D. players or other power supplies a reasonable distance from the KRS-IA as they might induce hum into the phono section. Our custom RCA connectors are made to very exact standards. Connectors of lesser quality can damage them or function improperly. Please check with your dealer or the factory as you could cause damage to your system or jeopardize your warranty.

SECTION

The KRS-IA is shipped with the phono section set up for a moving coil cartridge and loaded to 100 ohms. The loading can be changed with a set of internal switches. To access these switches the top cover of the preamps must be removed with the supplied allen driver. The phono section is located on the left side of the unit, as viewed from the front. In the middle rear of the phono PC board, which is mounted on standoffs, there is an 8 position switch. The various load possibilities are detailed below: ohms ohms ohms ohms ohms ohms ohms ohms ohms ohms
all switches all switches all switches all switches all switches all switches all switches all switches all switches all switches
in the open position = open except switch 8 on open except switch 7 on open except switch 6 on open except switch 5 on open except switch 4 on open except switch 3 on open except switch 2 on open except switch 1 on on
47,000 = 1,000 = 800 = 470 = 250 = 100 = 47 = 25 = 10 5

SECTION SET UP

The Compact Disc input of the KRS-IA is routed through an adjustable three pole phase correcting filter, a feature unique to KRELL preamps. The switches to adjust the filter are located underneath the phono section PC board. To access them, remove the phono section board by taking out the two screws holding the board in place with the allen driver. then simply slide the board forward out of its connector and out of the preamp. The 8 position switch, identical to the phono loading switch, will now be visible.Below is a listing of settings for various C.D. players. Kyocera 901 Kyocera, other models Magnavox 650 Meridian MCD & Pro NAD Nakamichi OMS 5 & 7 Pioneer SCD 909 PS Audio CD 1 Sony 101 & 701 ES Sony CD 302 i, i, 4, i, i, i, 2, 3, i, 3, 2 open, 3, 4, 5, 6, 3, 5, 6, 7 open, 2, 5, 8 open, i, 2, 3, 6, 7 open, 2, 3, 4, 3, 4, 5, 6, 7 open, 3, 4, 6, 7 open, 2, 3 open, i, 4, 5, 6, 6, 7, 8 open, i, 2, 2, 3 open, 4, 5, 6, 4, 5, 6, 8 open, i, 7, 4, 6, 5, 2, 5, 7, 4, 7, 2, on on on on on on on on on on

If you do not find your player listed you can contact your dealer or the factory for settings. In general, if you have a Sony type unit adjust I, 2, 3, 8 open, 4, 5, 6, 7 on; if you have a Phillips type unit adjust to 3, 4, 5, 6, 7 open, i, 2, 8 on. These are average settings for the two systems. After board adjusting the C.D. filter replace by reversing the removal procedure the phono described section above.

ADDITIONAL

SETTINGS

CDI OMS-7

3-6-7-8 I-3-4-6-7 4-5-8 3-4-8

i-2-4-5 2-5-8

on on on on on on on on on on on on
Nakamishi Magnavox Stax Q

open open

I-2-3-6-7 I-2-5-6-7

Mission Yamaha Adcom

2-8 2-8
i-3-4-5-6-7 i-3-4-5-6-7 open open 2-5-6-8 I-2-6-7 open I-2

GCD-300 CDC 20A

i-3-4-7 3-4-5-8
Kinergetics McIntoch Onkyo Sony Denon DX 330
3-4-5-6-7-8 4-5-6-7 4-5-6-7-8 3-4-5-6-8 open

i-2-3-8 i-2-3 i-2-7

CDP-620ES DCD-1700

6 z o , 5 4. 1 S-5

1 S-2 o

z 4 ~ , 2. 1 S-4

PREAMP