The Trek II
®
SSP-1C is designed to replace the AO-15331 two tube (#56-#57) pre-amp used in Hammond
®
A, AB, B, BC,
C, D and G consoles. The unit features a built in power supply and tremolo control circuitry for Leslie
®
speakers in the 122
family (models 21H, 22H, 22R, 31H above serial #5200, 122, 122A, 122RV, 122V, 142, 222, 222RV, and 242).
NOTE: The SSP-1C does NOT replace the AO-16875 five tube pre-amp which was used in BV, CV, and RT consoles as
well as in earlier organs which had vibrato kits installed.
1. Remove all wires from the left hand AC terminal of the old pre-amp. Remove all lugs and strip 3/8" insulation from
each wire. Temporarily group the wires together with a twist tie.
2. Remove all wires from the right hand AC terminal. Remove all lugs and strip 3/8" insulation from each wire.
Temporarily group the wires together with a twist tie.
3. Remove the wire going to the B+ lug. This wire brings high B+ voltage back from the tone cabinet and is no longer
used. Insulate this wire with tape or heatshrink.
4. Remove the remaining ground and GG leads from the pre-amp. Remove all lugs.
5. Remove cover from rheostat box and note the location of the black and red wires of the pre-amp signal cable. Unsolder
these wires.
6. Remove old pre-amp and mounting pan (model A only) from console.
NOTE: Because of their narrow case, model A consoles used a different pre-amp mounting method than other consoles.
Therefore SSP-1C mounting will be slightly different in those organs. Separate instructions are given where necessary.
SSP-1C SOLID STATE PRE-AMP
GENERAL INFORMATION
WARNING! INSTALLATION OF THIS UNIT REQUIRES DIRECT CONNECTION TO THE AC POWER WIRING AND MUST
BE PERFORMED BY QUALIFIED PERSONNEL ONLY.
NOTE: PLEASE LEAVE THIS INSTRUCTION / SCHEMATIC SET IN ORGAN
INSTALLATION
WARNING! BEFORE PROCEEDING WITH INSTALLATION, DISCONNECT AC POWER FROM THE ORGAN AND
INSPECT THE CONSOLE POWER WIRING FOR BRITTLE OR ROTTING INSULATION.
TREK II PRODUCTS
570
JERSEY AVENUE NEW BRUNSWICK, NJ 08901 USA
TEL: 732-214-9200 FAX: 732-214-9257
www.TrekII.com
Rev. 11/14/05 © 2005 Trek II Products
