I have been dealing with some noise with my 800rb and so I have done some research. I found some schematics on this site, but I also found a service memo that got me a bit confused as the pots didn't seem to match what was inside my amp.
So, after a bit more looking I found that there have been a few redesigns for this amp. I have attached schematics from 1982, 1991 and 1992. I haven't looked at the differences between 91 and 92, but 82 is notable as it uses a single pot for the hi/low crossover whereas the 91 and 92 use 2 pots ganged together.
Hope this helps someone. It sure helped me.
So, after a bit more looking I found that there have been a few redesigns for this amp. I have attached schematics from 1982, 1991 and 1992. I haven't looked at the differences between 91 and 92, but 82 is notable as it uses a single pot for the hi/low crossover whereas the 91 and 92 use 2 pots ganged together.
Hope this helps someone. It sure helped me.
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82 - power amps.jpg303.4 KB · Views: 169
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82 - power supply.jpg260.6 KB · Views: 141
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82 - preamp.jpg337.9 KB · Views: 168
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91 - power amps.jpg333.5 KB · Views: 131
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91 - power supply.jpg192.2 KB · Views: 124
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91 - preamp.jpg288.1 KB · Views: 93
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92 - power amps.jpg343.5 KB · Views: 97
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92 - power supply.jpg193.6 KB · Views: 77
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95 - preamp.jpg356.1 KB · Views: 99