Vox V-830 Distortion Booster...Help !

[bluedreamin]

Have any of you guys messed with one of these ? The tone control is worthless and basically does nothing , does anybody know a way to open the tone range on this thing and possibly add some bass ?
Thanks in advance for any help !! 

[petemoore]

  If there's a schematic, who's gonna' fetch it?

[AL]

There is a schematic somewhere - although I can't remember where and I can't find it at the moment - sorry.

But, I agree with you bluedreamin - the tone control is useless. I HATE that pedal. Maybe it would be better with a tone knob that actually works. I don't know. Personally, I think the best approach would be to gut it and use the box for something else. The box is great. This way it will look AND sound good.

AL

[petemoore]

The tone control is worthless and basically does nothing , does anybody know a way to open the tone range on this thing
  AMZ Labs notebook, ...just messing with the values...looking at the schematic would tell tales, try google search for it?
   and possibly add some bass ? larger value capacitors used in series with the signal path [input/output/between stages].

[bluedreamin]

Ya know what , now that I think about it I believe I did find a schematic and it's either somewhere deep in my pc or possibly printed out , I'll do some diggin but yeah this is a cool pedal , damn good lookin but c'mon , a tone control that basically does nothing ! I'll see what I can find and thanks to all you guys for your consideration in this matter !!

[bluedreamin]

No luck on the schems but I'll keep searching . This pedal has been sitting around awhile and sure would love to get it sounding better and more usable ! If anybody comes up with something , let me know .

[petemoore]

  Trace out the tone control circuit?
  It could be a simple pot/cap to ground affair, [useless' tone controls often are just a ^touch of adjustable LP Filter] IWCase you could try simply upping the value of the cap.

[bluedreamin]

Hey guys ...I found a schem , someone in another forum sent it to me but don't know how to post it ! If you are interested I can email it !!

[MartyMart]

Hey guys ...I found a schem , someone in another forum sent it to me but don't know how to post it ! If you are interested I can email it !!

Thanks for the schem, the tone control looks very odd, seems to be a 20k pot, circuit in at lug3 with a 39k r over 3&1
.033uf to lug3 a 39k from vref to lug 3 and a .01uf from vref to lug 1& the parallel 39kr output to vol recovery at lug 2
via a 4u7.
Why have a 39k across a 20k pot ? doesn't that make about a 7k pot ? ... then just use a 10k !
( perhaps the schem is bogus ! )
Perhaps playing with C20 (.033) and C17 (.01) would help, but this wireup has me a bit stumped.
In use, the tone pot does nothing with the unit just "clean boosting" but does work once the gain
pot is up around 3/4 and distortion is present, perhaps this was the idea ie: unaltered clean gtr
with tone roll off ONLY when it's distorting ?
Even then, only the shrill high stuff is rolled out, there's no "muted" tones available.
All the tone components are buried under the second board, so it's a total pig to get to .....

MM.