Valve amp problems

[i_got_a_mohawk]

Its with my Peavey Classic 30, i know its a guitar amp, please just give me a chance to ask this one tho

When i turn it on and play through it there is a low drone-ing sound in the background that gets louder and louder, only way to stop it is switching off the amp

Alot of stuff got moved about yesterday but i was careful as always with it, ill check and see if any of the tubes arent properly seated later on, but am sure they all are

Any suggestions as to what this would be? hopefully a tube problem, pre or power you recon?

Cheers guys

- Will

 

[i_got_a_mohawk]

Anyone?

 

[Psycho Bass Guy]

That's called motorboating and it's usually caused by bad caps or bad cap connections. You may have knocked one of your coupling capacitors loose moving the amp around.

 

[i_got_a_mohawk]

That's called motorboating and it's usually caused by bad caps or bad cap connections. You may have knocked one of your coupling capacitors loose moving the amp around.

feck

 

[i_got_a_mohawk]

On quickly checking the amp out again, it seems to only happen when the reverb is on, if it happens and you turn the reverb off the hum goes, meh! good thing i dont really use reverb

 

[eots]

Does this amp use a tube to drive the reverb?
Maybe just check to see that all tubes are fully inserted into their sockets. A cap wouldn't normally come loose as it's soldered in place.

 

[i_got_a_mohawk]

The V2 pre tube was out of place a little, but pushing it in properly made no difference, im not sure if a tube drives it or not, the question is on the peavey forum atm anyways, cheers

I dont think theres a tube specifically for driving it, with the clean channel its the V1 pre tube, V3 pre tube is the driver tube for the power section i think, and changing onto the distortion channel just adds the V2 pre tube into the circuit, i think

 

[i_got_a_mohawk]

Right, this was a very simple fix, got a reply from the guys at peavey, apparently it happens sometimes, was apparently the reverb pan feeding back, and they suggested moving its position, and, well it seems to have worked

- Will