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Re: Troubleshooting a 250 model 1 Bass amp [message #27394 is a reply to message #27393] Tue, 25 June 2019 06:08 Go to previous messageGo to previous message
stevem is currently offline  stevem
Messages: 4733
Registered: June 2004
Location: NY
Senior Member
Hello and welcome!

You should have come here first before doing anything trouble shooting wise to the to the amp, as these are not like tube amps with just a positive power supply , they run on a + and - supply.

1) the two main filters that you replaced rarely go bad and even if they do the amp still works but with 120 HZ hum coming out of the speaker (s).

2) you shot yourself in the foot by unplugging that 3 wire connector on the 5065 output driver board and then turning the amp on!
That board gets its needed ground connection from that plug and without the ground you blew up some Transistors , hence the 38 volt power supply reading you now have on the speaker jack!

Do you know how to test Transistors, as that's the point your at now?

I am going to be on vacation for a few days so I can really help you with this repair but Bill who is a great member on this site can help you out for sure !

[Updated on: Tue, 25 June 2019 06:13]

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