For the most part, for the old amps, you have to make them yourself or get them from someone who has taken the time to make them. Very few were distributed by the manufacturer at the time. If they were, they were faxed and some of the copies are multi-generation fax copies.
Taken a step backwards. Pulled the muting transistors to see if the amp achieved full output. Not sure if it was at full output ( didn't have it powered on long enough to be sure) but it had significantly increased. Almost immediately the 6491 that was shorted before heated up and blew out.
Replaced it and then checked the emitter resisters they were all reading between 0.007v and 0.009v. I pulled all the output transistors on that side and checked them, they all tested good.
Replaced it and then checked the emitter resisters they were all reading between 0.007v and 0.009v. I pulled all the output transistors on that side and checked them, they all tested good.
Do you have essentially the same DC voltage across all of the emitter resistors in that channel? The voltage across these resistors tells you where the current is flowing. That's why the higher voltage for one of the emitter resistors for one of the output transistors pointed to a problem.
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- Orion HCCA 2100 no rail voltage.