2ch Dual - Channel switching problem

[streetwise]

My Rev G Dual Rectifier drops volume for a fraction of a second when switching channels. Is this normal, or is it a faulty LDR/relay? This is pretty annoying because I'm using orange channel for a boosted lead tone for soloing.

The orange channel sounds very dark too, current settings: bass noon, mid noon, treble and presence cranked almost to the max. On red channel all the knobs are pretty much at noon.

Both channels are using the same tubes so I don't think it's a tube related problem, because red channel sounds great.

The amp is an early Rev G with series loop. Serial number is somewhere around 3000, I don't currently have the amp at home.

 

[AudioMonk]

Hello. Yes, this sounds exactly like an LDR problem. There are 5 or so LDR's and a 5 or 6v DPDT relay associated with this channel. Test signal needs to be put into the amp and then traced to LDR's linked to the orange channel. A sine wave traced with a signal tracer or scope will reveal the faulty LDR....that is, it will show where signal drops off. Depending on which LDR it is, the tech should be certain not to simply snip the LDR out to replace it. It should be de-soldered and the new component inserted back into the board.

 

[streetwise]

Oh, that sucks... I'll just have to buy a scope then...

 

[streetwise]

Okay. So orange channel indicator led stopped working. I built a JYETech LCD-scope. Maybe I'll tinker with the amp next week on vacation.

Any clues would be helpful, I'm not very familiar with this complex switching matrixes.