Peavey Stereo Chorus 400 - No Vibrato

[lowell]

Your Classic 50 has an FX loop?! Working on one now with a loud 60hz hum. No FX loop.

[lowell]

Yeah I shoulda looked at the circuit, that’d make sense. My bad. Thanks for the detailed reply!

[lowell]

Thanks JPB. So it seems both effects are working as twiddling with the controls for tremolo works, and same for chorus. However, and please let me know...

[lowell]

I'm an authorized tech for Mesa and there's no schematic on their tech page. They have a pdf that says these amps need to be sent to the factory to be updated...

[lowell]

Thanks! That worked. And now the posts are in order too! I had been frustrated as the entire forum seemed to change months ago and was difficult to navigate....

[lowell]

...

[lowell]

This is all I see...

[lowell]

Links don't seem to work for some reason... The Dude your link just opens a new tab/window to the ampage.org site.

Nosaj the ic link...

[lowell]

Hey folks,

Hope everyone is doing well! I have this amp in and the chorus works, but the vibrato does not work. I cannot find a schematic to...

[lowell]

Just discovered this thread, as I am in search of one as well. Here is a link to a supplier. It doesn't LOOK the same, but says it'll work in this application....

[lowell]

Update: Replaced Q2 and it's fixed. If anyone gets one of these in with farty tone, and a low reading from Emitter to Ground on Q2 then I'd try replacing...

[lowell]

I don't have my tracer at this time unfortunately. I got one from PV, here ya go hope it's of use for someone else.

I am only getting 1.2k from...

[lowell]

Did you ever get a schematic for this? I have one with a horrible farty sound. Not the speaker and voltages are good. There isn't an fx driver transistor...

[lowell]

On Dirty channel, the reverb pot adds hum when turned up... but it's a different hum... higher. Probably 60hz, sounds like when you have an unterminated...

[lowell]

Okay no bites so I assume everyone is as stumped as me. I went ahead and recapped the filters for the high and low supplies. Didn't help. Here's a recording...

[lowell]

I tried grounding U4 Pin2 and I get a super loud hum. I then tried this with a BFC, super loud hum. Is this normal? I would think if anything, it might kill...

[lowell]

Wakculloch, did you ever fix this issue? I have one in with the exact same issue. Everything you posted is exactly the same.

I've noticed however,...

[lowell]

Thanks I'll try it....

[lowell]

Ya know, I had already read your other thread on this. That unfortunately isn't the issue here. Thanks for the input though....

[lowell]

I will look into it... so I am noticing now, that the reverb sounds wonky. The reverb isn't super strong, and the decay is "wobbly." It may just...

[lowell]

Right on, will do