Valvette Custom Drive  [traced]

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.

Valvette Custom Drive

Postby Ice-9 » 04 Oct 2010, 12:28

Here are some gut shots of the Valvette custom drive taken during dissasembly.

Image
Image

Ahh ! all gooped up
Image

newly de-gooped

Image

diodes have no markings, they look like germaniums

Image

The opamp is a OPA2107AP
the fets are N channel 2N7000 used as part of the clipping circuit along with the diodes.

quite a nice sounding low gain overdrive that cleans up very nicely at minimum gain.
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !

No silicon heaven ? preposterous ! Where would all the calculators go ?
User avatar
Ice-9
Transistor Tuner
 
Posts: 1005
Joined: 31 Mar 2009, 16:29
Has thanked: 131 times
Have thanks: 338 times

Re: Valvette Custom Drive - Degooped guts and Re'd

Postby culturejam » 04 Oct 2010, 14:05

Thanks for posting!

But, uh, where is the part where the pedal is "Re'd"?

I'm assuming that means "reverse engineered". :D
User avatar
culturejam
Old Solderhand
 
Posts: 4264
Joined: 24 Feb 2008, 06:59
Has thanked: 458 times
Have thanks: 567 times

Re: Valvette Custom Drive - Degooped guts and Re'd

Postby Ice-9 » 04 Oct 2010, 14:24

culturejam wrote:Thanks for posting!

But, uh, where is the part where the pedal is "Re'd"?

I'm assuming that means "reverse engineered". :D


Yes thats exactly what it means, I am just drawing up the schematic now to post having just double checked it. I only got this pedal delivered this morning, So this is quite fast work to take some pics and de goop and trace it, then get it all posted in a matter of a few hours. :)

You asked for it so here it is, next post
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !

No silicon heaven ? preposterous ! Where would all the calculators go ?
User avatar
Ice-9
Transistor Tuner
 
Posts: 1005
Joined: 31 Mar 2009, 16:29
Has thanked: 131 times
Have thanks: 338 times

Re: Valvette Custom Drive - Degooped guts and Re'd  [traced]

Postby Ice-9 » 04 Oct 2010, 14:27

Schematic

Image

VR1A and B is a dual gang pot to control the gain.
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !

No silicon heaven ? preposterous ! Where would all the calculators go ?
User avatar
Ice-9
Transistor Tuner
 
Posts: 1005
Joined: 31 Mar 2009, 16:29
Has thanked: 131 times
Have thanks: 338 times

Re: Valvette Custom Drive - Degooped guts and Re'd

Postby culturejam » 04 Oct 2010, 14:35

Ice-9 wrote: So this is quite fast work to take some pics and de goop and trace it, then get it all posted in a matter of a few hours. :)

Whoops! :oops: :lol:

Nice work!
User avatar
culturejam
Old Solderhand
 
Posts: 4264
Joined: 24 Feb 2008, 06:59
Has thanked: 458 times
Have thanks: 567 times

Re: Valvette Custom Drive - Degooped guts and Re'd

Postby Hides-His-Eyes » 04 Oct 2010, 14:39

So is the second part of the dual ganger to reduce the effect of the diodes to ground at low gain values?
Testing, testing, won too fwee
User avatar
Hides-His-Eyes
Tube Twister
 
Posts: 2015
Joined: 02 Feb 2010, 13:34
Has thanked: 53 times
Have thanks: 84 times

Re: Valvette Custom Drive - Degooped guts and Re'd

Postby IvIark » 04 Oct 2010, 14:41

Nice work! And yet another Zendrive added to the list.
"If anyone is a 'genius' for putting jacks in such a pedal in the only spot where they could physically fit, then I assume I too am a genius for correctly inserting my legs into my pants this morning." - candletears7 - TGP
User avatar
IvIark
Tube Twister
 
Posts: 2298
Joined: 02 Jan 2008, 00:59
Location: Manchester UK
Has thanked: 662 times
Have thanks: 667 times

Re: Valvette Custom Drive - Degooped guts and Re'd

Postby Ice-9 » 04 Oct 2010, 14:47

Hides-His-Eyes wrote:So is the second part of the dual ganger to reduce the effect of the diodes to ground at low gain values?


When the gain is at max the the pot VR1A is at max resistance (IC1a feedback loop) and VR1B is at minimum resistance (Hard clipping ) So yes you are correct.
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !

No silicon heaven ? preposterous ! Where would all the calculators go ?
User avatar
Ice-9
Transistor Tuner
 
Posts: 1005
Joined: 31 Mar 2009, 16:29
Has thanked: 131 times
Have thanks: 338 times

Re: Valvette Custom Drive - Degooped guts and Re'd

Postby DimebuGG » 04 Oct 2010, 14:55

Hmmmm clipping section in both feedback loop and to ground sounds like the pedal is being choked!
Finch: A witty saying proves nothing - Voltaire
Stifler: Suck my dick - Ron Jeremy
User avatar
DimebuGG
Solder Soldier
 
Posts: 210
Joined: 02 Sep 2008, 12:37
Location: Doha, Qatar
Has thanked: 8 times
Have thanks: 159 times

Re: Valvette Custom Drive - Degooped guts and Re'd

Postby okgb » 04 Oct 2010, 14:58

Nice work
I don't feel bad about seeing degooped circuits when it turns out
to not be their own circuits , dual pot , anything use these in a
simular manor ?
okgb
Diode Debunker
 
Posts: 748
Joined: 16 Mar 2010, 04:58
Has thanked: 181 times
Have thanks: 39 times

Re: Valvette Custom Drive - Degooped guts and Re'd

Postby DougH » 04 Oct 2010, 15:09

IvIark wrote:Nice work! And yet another Zendrive added to the list.


Not exactly... Shunt diode clipping with variable resistance adj by gain control. Hammer's SWTC too.
"You have just tubescreamered or fuzzfaced yourself " -polarbearfx
DougH
Transistor Tuner
 
Posts: 1106
Joined: 18 Aug 2007, 05:53
Has thanked: 4 times
Have thanks: 21 times

Re: Valvette Custom Drive - Degooped guts and Re'd

Postby Ice-9 » 04 Oct 2010, 15:31

okgb wrote:Nice work
I don't feel bad about seeing degooped circuits when it turns out
to not be their own circuits , dual pot , anything use these in a
simular manor ?


I agree, when this pedal arrived today and i seen the goop i thought good it may be something a bit special in which case i would not have posted the schematic, but after working out the schematic and it turned out pretty standard stuff then i decided to post it as this pedal cost me £130 uk. which is a lot for a circuit that is based on others and modded a bit. Thats why I posted the schematic.
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !

No silicon heaven ? preposterous ! Where would all the calculators go ?
User avatar
Ice-9
Transistor Tuner
 
Posts: 1005
Joined: 31 Mar 2009, 16:29
Has thanked: 131 times
Have thanks: 338 times

Re: Valvette Custom Drive - Degooped guts and Re'd

Postby IvIark » 04 Oct 2010, 15:45

DougH wrote:Not exactly... Shunt diode clipping with variable resistance adj by gain control. Hammer's SWTC too.

No not exactly, but Supercharged Zendrive would still be a more appropriate name.
"If anyone is a 'genius' for putting jacks in such a pedal in the only spot where they could physically fit, then I assume I too am a genius for correctly inserting my legs into my pants this morning." - candletears7 - TGP
User avatar
IvIark
Tube Twister
 
Posts: 2298
Joined: 02 Jan 2008, 00:59
Location: Manchester UK
Has thanked: 662 times
Have thanks: 667 times

Re: Valvette Custom Drive - Degooped guts and Re'd

Postby mcaviel » 04 Oct 2010, 17:32

Ice-9 wrote:I agree, when this pedal arrived today and i seen the goop i thought good it may be something a bit special in which case...


This is what i always thought about my gooped pedals, that the builder is hiding his special circuit when the truth is that he is hiding a clone.
User avatar
mcaviel
Solder Soldier
 
Posts: 191
Joined: 18 Nov 2009, 12:41
Has thanked: 87 times
Have thanks: 19 times

Re: Valvette Custom Drive - Degooped guts and Re'd

Postby DougH » 04 Oct 2010, 17:50

IvIark wrote:
DougH wrote:Not exactly... Shunt diode clipping with variable resistance adj by gain control. Hammer's SWTC too.

No not exactly, but Supercharged Zendrive would still be a more appropriate name.


Yes, it's the same theme.
"You have just tubescreamered or fuzzfaced yourself " -polarbearfx
DougH
Transistor Tuner
 
Posts: 1106
Joined: 18 Aug 2007, 05:53
Has thanked: 4 times
Have thanks: 21 times

Re: Valvette Custom Drive - Degooped guts and Re'd

Postby culturejam » 04 Oct 2010, 19:09

Ice-9 wrote:I agree, when this pedal arrived today and i seen the goop i thought good it may be something a bit special in which case i would not have posted the schematic,

Why not?

I'd much rather see a schematic posted from something creative or innovative instead of the same old crap in a different box.
User avatar
culturejam
Old Solderhand
 
Posts: 4264
Joined: 24 Feb 2008, 06:59
Has thanked: 458 times
Have thanks: 567 times

Re: Valvette Custom Drive - Degooped guts and Re'd

Postby Ice-9 » 04 Oct 2010, 20:29

culturejam wrote:
Ice-9 wrote:I agree, when this pedal arrived today and i seen the goop i thought good it may be something a bit special in which case i would not have posted the schematic,

Why not?

I'd much rather see a schematic posted from something creative or innovative instead of the same old crap in a different box.


Yeah ! I see your point and agree, I was hoping this was going to be an interesting and innovative but its not.
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !

No silicon heaven ? preposterous ! Where would all the calculators go ?
User avatar
Ice-9
Transistor Tuner
 
Posts: 1005
Joined: 31 Mar 2009, 16:29
Has thanked: 131 times
Have thanks: 338 times

Re: Valvette Custom Drive - Degooped guts and Re'd

Postby Adji » 07 Oct 2010, 20:36

Guess there is no need for my pics then hehe.
Sorry I missed all this, been busy this week.

I know the guy who makes these and I have one, I like it, really good low gain overdrive / boost. Never played an actual ZenDrive before so do not know how close they sound. I thought this was an original circuit, shame.
Adji
 
Posts: 32
Joined: 16 Sep 2010, 14:46
Has thanked: 1 time
Have thanks: 1 time

Re: Valvette Custom Drive - Degooped guts and Re'd

Postby IvIark » 08 Oct 2010, 00:33

DougH wrote:Yes, it's the same theme.

Yup. Here's the originality layout.

Image

So the red bit is very slightly tweaked Zendrive, the yellow bit is very slightly tweaked Gain Stage Red, the green bit is the R&D effort which is a very slightly tweaked feedback loop clipping config and what must be a very slightly tweaked something!

To be fair he's not claiming any originality in the marketing copy. Yay to him!
"If anyone is a 'genius' for putting jacks in such a pedal in the only spot where they could physically fit, then I assume I too am a genius for correctly inserting my legs into my pants this morning." - candletears7 - TGP
User avatar
IvIark
Tube Twister
 
Posts: 2298
Joined: 02 Jan 2008, 00:59
Location: Manchester UK
Has thanked: 662 times
Have thanks: 667 times

Re: Valvette Custom Drive - Degooped guts and Re'd

Postby salocin » 08 Oct 2010, 01:44

This pedal has the lamest goop ever! It doesn't even seem to hide anything, other than maybe the IC and transistor types. I can't believe they used jumpers on the circuit board either.
User avatar
salocin
Resistor Ronker
 
Posts: 350
Joined: 02 Apr 2008, 01:27
Location: Dunedin, NZ
Has thanked: 5 times
Have thanks: 6 times

Next

Return to Boutique Stompboxes dissected...

Who is online

Users browsing this forum: vic, zakk and 4 guests