Let me introduce you all ...

[jaymanaa]

Hi all, I was wondering if any of you guys would happen to have a service manual (or schematic) on these Fisher Hybrids. I just finished a much needed recap on mine, and I think I need to set the bias on the transistor outputs. One heat sink is running considerably warmer than the other. Post 17 above shows a good picture of the layout and I'm guessing that the pots labeled P1-P4 are the adjustments, but I'm not sure of the procedure. Thanks, Jay

 

[Micropassatman]

Here are the pics:

I have the service manual for mine. It is the 69T receiver. It seems to be made up of the following:

P1368 AM-FM Front End
1285 Preamplifier
1381 IF Amplifier
1242 Multiplex Decoder
1282 Control Amplifier

 

[jaymanaa]

Here are the pics:

I have the service manual for mine. It is the 69T receiver. It seems to be made up of the following:

P1368 AM-FM Front End
1285 Preamplifier
1381 IF Amplifier
1242 Multiplex Decoder
1282 Control Amplifier

That looks like the pre in mine also. Is the amplifier in yours a hybrid that uses 6HU8s (ELL80s)? If so, does the service manual give instructions for biasing? Thanks, Jay