Peavey 5150 Combo Problem

[cepinner]

Hi all,

Please help.

I just replaced the original (1995) chinese pre-amp and power-amp tubes as I had lost power and the volume controls for both channels were ineffective. I replaced with JJ Electronics (these were old too as I bought these back in 1999). As soon as I powered up the new tubes I noticed a soft crackling in both channels and now have to turn it up 20% higher to achieve the same volume. I then tried swapping out pre & pow tubes in attempt to isolate a faulty new tube and now I get very loud popping with a constant very loud rumble and have to turn the amp off immediately.

All the new tubes seem to look fine. The only thing that I have noticed is the left power tube fits a little loose in it's socket. Also, (not sure if relevent) this amp has gone for long periods of not being used.

Any input would be appreciated - Thanks in advance.

CP

[paulh]

I wouldn't trust the JJ's. Buy youself new pre amp tubes. I have had good luck with 12AX7EH Electro Harmonix's.

[chris78]

im not sure but i have a 5150 combo and the power light will not turn on but the tubes light up and makes a humming sound if anyone might no this problem please send a reply

[Enzo]

Ho CHris, welcome to the place. Why don't you start a new thread for your amp instead of adding on here. This thread had been dormant for seven months now. Youo'll get better response.

On yours the tubes may light up, but there are several fuses inside the unit for the various voltages it operate on. I'd suspect one or more are blown, and an operating voltage is now missing inside.

The voltages these amps run on inside can KILL YOU, so always work inside with th power cord unplugged and wait at least 10 minutes before going inside so things can discharge.


And fuses usually blow for a reason...