Bass amp troubles

[lol]

Hello,

I have a Trace Elliot v type 5001. It is a hybrid amp, 2 preamp tubes and solid state power amp. The issue I am having is there is a buzzy sound that seems to follow when playing certain notes. I know its not my basses as the issue happens with all of them. I've tried different preamp tubes and that did not solve the issue. I also used deoxit on the pots and all inputs and the issue persists.

Any idea what the problem could be?

Thanks!

 

[Massarea Whippins]

That amp has a Mosfet based power section. From your description of "buzzy sound that seems to follow when playing certain notes" My guess that the Mosfets need to be re-biased. I have no experience with a V-Type 5001, but the Ampeg SVT 3-PRO is also Mosfet output, and is rather notorious for the same problem with the same symptoms. I also note that many/most "amp techs" seem to be clueless about to diagnose and fix this, so I researched and learned how to bias my own 3 PROs (I have three). It just takes a good multimeter and a steady hand. I'm not saying I'm right about your V-Type 5001, but it's worth looking in to. Good luck!

 

[lol]

That amp has a Mosfet based power section. From your description of "buzzy sound that seems to follow when playing certain notes" My guess that the Mosfets need to be re-biased. I have no experience with a V-Type 5001, but the Ampeg SVT 3-PRO is also Mosfet output, and is rather notorious for the same problem with the same symptoms. I also note that many/most "amp techs" seem to be clueless about to diagnose and fix this, so I researched and learned how to bias my own 3 PROs (I have three). It just takes a good multimeter and a steady hand. I'm not saying I'm right about your V-Type 5001, but it's worth looking in to. Good luck!

Thanks so much! I do believe this amp does have adjustable bias for the power section. I'll pop it open and do some research to see how to tackle this.

Thanks again!