EBS Valvedrive volume drop

[MDWagstaff]

I've got an EBS Valvedrive (original version) that I've been using fairly regularly for the last 3 years with no issues. Recently however after half an hour it's start dramatically dropping in output volume. Does anyone know what might cause this?

[MDWagstaff]

Bump

[ahpook]

Have you tried taking the cover off and making sure the valve's seated correctly ? Might be worth trying another valve....

[Trueno]

I'm no expert, but I understand that messing with valves can be rather injurious to your health, even when unplugged from the mains sometimes. I'd take it to a pro.

[dannybuoy]

Swapping a preamp valve should be safe enough. Amps can store a lot of charge in their capacitors which you have to be careful of, but you can switch out a valve pretty easily, just pull it out and shove the new one in!

[ahpook]

[quote name='Trueno' timestamp='1469873884' post='3101620']
I'm no expert, but I understand that messing with valves can be rather injurious to your health, even when unplugged from the mains sometimes. I'd take it to a pro.
[/quote]

You're wise to advise caution, but in this case there's no real danger, the valves are a user-serviceable part !

IIRC the Valvedrive is a starved plate design anyway, there's not the hundreds of volts you've see in valve amp.