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Re: Transistor replacements anno 2023 [message #28905 is a reply to message #28901] Mon, 23 January 2023 17:13 Go to previous messageGo to previous message
stevem is currently offline  stevem
Messages: 4772
Registered: June 2004
Location: NY
Senior Member
Hi.
With what you have gone thru so far I want to say that the low level 100hz hum that you have is due to unmatched 2n3055 output transistors.
If the pairs on each leg of the power supply are not matched close enough the. They can not phase cancel out that low mv of ripple voltage.
If you measure the ripple voltage you have on the speaker output with a volt meter you can tell which of the two pairs of outputs unmatched.

If the DC voltage you read is positive then that's the pair of outputs it coming from, if it's negative then it's the other pair that is at fault.

This is my best guess at this point for what's going on with your amp.

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