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Troubleshooting a 250 model 1 Bass amp [message #27393] Mon, 24 June 2019 20:00 Go to previous message
Byteviolator is currently offline  Byteviolator
Messages: 13
Registered: June 2019
Junior Member
Power amp PC5065
Selectone pre-amp PC5067
Pre-amp PC5066

Hello all,
I gigged alot with this amp in the 80s and I vaguely remember using it around 95/96, since then its been collecting dust. Last week I hooked it up and and would hear a kind of rapid ticking sound from the Selectone with the volume on max. Extremely low output if I used the bottom pre-amp maxed out. (I used a drum machine on the input and I got a very low brap/brap type of sound)
I started by replacing the 4500uf filter caps with 4700uf 80V. After jiggling the P5 connector on PC5065 I now have no output on the selectone and the same low output on the lower pre-amp.
If I remove the P5 connector from the power amp I measure 38V at the output jack. Is this normal since there is no input? Should I connect an external signal to the power amp board ORN/BLK wire (J1)to test it?
I also tried to connect the output of PC5066 to an external amp and got nothing out of it.
What would be the best way to start troubleshooting this amp now?

Thanks for reading and any ideas would be greatly appreciated.

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