Any Love For The Digitech Valve FX?

[DrDckhol3]

I've just acquired one of these, seems to be some love out there for them, but not from me....at least not yet. I can't get a good signal out of it. It's very , and I mean very, faint. Any suggestions? I hope it doesn't turn out to be a  :poop:

[Sparker]

I've had a couple of these. I liked the all in one convenience of preamp and effects all in a shiny 1U case. The preamp tube gain was fairly mild though and you really had to wind the compressor right up to get any sort of lead tone, but then noise also increased lots. It was good as a clean / rhythm unit, but the single 12AX7 just did not seem to give enough 'ooomph' on its own. It's like it needed a 2 Tube mod! Never used the SS tones, which seemed to be based on the popular Digi stomp stuff and didn't appeal to me. That said, it was not a faint or weak sounding unit, so maybe you have something else going on in there with yours. Could try a factory reset, see if that improves things.

[DrDckhol3]

Did the factory reset when I got it. There is definitely something wrong with it. Checked the inputs and they are not suffering from any disconection from the board sooo..... :poop:

[rnolan]

What are you running it into, could be inst/line level miss match?

[DrDckhol3]

Headphones as well as left and right outs all have only a faint hint of the signal coming through. :dunno:

[Sparker]

Any signal coming through in bypass mode?

[DrDckhol3]

Any signal coming through in bypass mode?

.

Negative

[Sparker]

And the front panel control stuff works as normal - buttons, LCD screen, LED display, selector knob?

[DrDckhol3]

Yes, everything works, I just hear a very faint top end hiss on distorted settings and that's it.

[Sparker]

Ok, you will have to open the top of the case and check some low DC voltages, first either side of the +/- 12V regulators U6 and U7 with a multimeter. If you can post some high res pics of the board inside the case, I can tell you where to probe. Are you able to do this?

[DrDckhol3]

I will post them when I get off work tonight. I am somewhat of a newb although I did convert my Marshall from 6L6 to EL34 with no problem so I'm confident that I can change some components out if I need to. I appreciate your help.

[MarshallJMP]

Do you have a schematic,maybe i can help too?

[DrDckhol3]

Ok, you will have to open the top of the case and check some low DC voltages, first either side of the +/- 12V regulators U6 and U7 with a multimeter. If you can post some high res pics of the board inside the case, I can tell you where to probe. Are you able to do this?

Here are some pics http://s34.photobucket.com/user/drdckhol3/library/Digitech%20Valve%20FX

[DrDckhol3]

Do you have a schematic,maybe i can help too?

I don't have scematics :facepalm:

[Sparker]

Schematics and manual attached