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Home » VintageKustom.com » Repairing Kustom Amps » 250-4 (got it burnt up to repair on my bech)
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Re: 250-4 [message #28664 is a reply to message #28618] Wed, 13 July 2022 17:17 Go to previous messageGo to previous message
stevem is currently offline  stevem
Messages: 4775
Registered: June 2004
Location: NY
Senior Member
If you input like 150mv into either preamp you should be able to have close to 3 volts rms show up at the power amp booster jack on the rear of the amp.

I would check that you have 12 volts + and - feeding the preamps from the two Zener diodes.
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