ICBM you're good at amps AND have a Tremoverb...

[Cirrusband]

If my tremoverb is kinda on the verge of oscillating motorboat type sounds (they kinda start for a few seconds at a time) when in solid state rectifier mode but is fine and awesome sounding when on tube rectifier mode, what might be up?

[Sir Axeman]

the valve rectifier valve is past its use by date?

[Cirrusband]

the valve rectifier valve is past its use by date?

But it works fine in valve rectified mode? Or are you doing a funny?

[ICBM]

In solid-state rectifier mode, all the valve voltages are higher, which might mean something.

Try changing V3 and/or V4 (the two furthest from the input jacks in the front row of preamp valves), both of which are cathode-followers that can be affected by high voltages. Do not use Russian-made valves in these positions if you can avoid it, they're prone to failure in this configuration.

If that doesn't do anything, I'll have another think .

[Cirrusband]

Cheers will try swapping them out. I think it's mostly tung sol and a couple of jjs at the mo.

[ICBM]

Cheers will try swapping them out. I think it's mostly tung sol and a couple of jjs at the mo.

If the Tung-Sols are in V3 or V4 that could be it - Vox don't use them in the middle slot in the AC30CCs for exactly that reason, even though they do in the other two - and it's also why Mesa have switched from Russian to JJ across the board. I personally don't like the sound of JJs much in 'gain' positions, but they do hold up better as cathode-followers. If they aren't already, I'd put the JJs in V3 and V4 and the Tung-Sols in the others.

If you're interested, replacing V5 and V6 - the two in the back row, the reverb drive and phase inverter - with 12AT7s opens up the tone quite a bit and makes the reverb deeper.

[Sir Axeman]

But it works fine in valve rectified mode? Or are you doing a funny?

No...simply misread your OP as it was noisy in valve rectifier mode...sowwie.

[Cirrusband]

If the Tung-Sols are in V3 or V4 that could be it

Well, they were indeed in V3 and V4. I changed them out last night and now it works fine in both rectifier modes. Cheers ICBM!

[ICBM]

Well, they were indeed in V3 and V4. I changed them out last night and now it works fine in both rectifier modes. Cheers ICBM!

Just out of curiosity, do you notice any difference in tone? I like the Tung-Sols in positions where they don't cause trouble (which is anywhere apart from cathode followers), they sound nice and clear - one of the closest new-production valves to a 'NOS type tone'.

[Cirrusband]

Just out of curiosity, do you notice any difference in tone? I like the Tung-Sols in positions where they don't cause trouble (which is anywhere apart from cathode followers), they sound nice and clear - one of the closest new-production valves to a 'NOS type tone'.

It couldn't really say for sure because I wasn't being very scientific about it! I switched the rectifier setting straight away, then once I'd determined the amp was working fine I switched from EL35s to 6L6s.

I do like the Tung Sols too though - I've got three of them in my slowly shifting mix of preamp tubes. Do you think the ones I took out of the Tremoverb will be ruined now, or are they likely to still be ok once they're put in a less demanding position?