Blue Shoe Gai Pan Distortion

K Pedals

Well-known member
This one sounds pretty cool...
Not sure if I biased it right...
Just did 4.5v on all of em...
sounds pretty good...
 

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I biased the prototype 100% by ear, never even broke out the DMM....

I just adjusted the trims back and forth one at a time and listened for the most full and open sound.

Just curious, did you get your NE5532 from Tayda?
 
I biased the prototype 100% by ear, never even broke out the DMM....

I just adjusted the trims back and forth one at a time and listened for the most full and open sound.

Just curious, did you get your NE5532 from Tayda?
Cool!!!
Yeah these didn’t seem to be as picky as the son of ben ones...
I probably did get it from Tayda but it could’ve been mouser...
I can’t really remember...
I’m ordering so many parts now-a-days it’s hard to keep up...
 
Was just curious, mine crackled and popped like crazy. Swapped it out with a TL072 and it cleared right up.

Wasn't sure if it was just a bad opamp (if so it'll be the first defective part I've ever gotten from Tayda) or if it wasn't a legit part.

Probably was just a defect.... After hundreds of thousands of parts ordered over the years for pennies, I can't really complain about one bad opamp. :ROFLMAO:
 
Was just curious, mine crackled and popped like crazy. Swapped it out with a TL072 and it cleared right up.

Wasn't sure if it was just a bad opamp (if so it'll be the first defective part I've ever gotten from Tayda) or if it wasn't a legit part.

Probably was just a defect.... After hundreds of thousands of parts ordered over the years for pennies, I can't really complain about one bad opamp. :ROFLMAO:
Yeah I love Tayda...
I know I’ve heard some people don’t ... but I order a lot of stuff from them... I’ve started realizing some of their transistors seem like they’ve been picked through and some ICs (mainly tc1044) aren’t too good... and so now I get my transistors and caps and ICs from mouser
but all in all I love Tayda...
 
Pots
A500k x2
B10k x2
A50k
B100k Dual
resistors
120k
330r
22k x2
3.3k x2
1m x2
10k x3
1.5k
470k x3
4.7k x4
12k x2
6.8k
5.6k x2
2.7k
Electrolytic’s
100u
4.7u x2
10u x3
47u
47p x2
470p x2
Transistors
J201 x3
IC
TC1044
TL072
NE5532
Diodes
1N5817
idk about the film caps cause I already soldered it
 
Beautiful! Gloss black box is very classy. If it sounds good, you biased it right. Is that a "gold" switch from BLMS? I picked up a few on my last order. Now for the $64,000 question:
Does it make you sound like Paul Gilbert?
 
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If anyone else is building one, I'd recommend trying out biasing using RunOffGroove 'Triode Emulation' formula.

A closer look at the Fetzer Valve
1585523114858.png

Vcc is supply voltage -- The 1044 puts the supply voltage (from a typical 1-spot supply) up to 17.55.
Vp is the pinchoff voltage of the JFET -- RoG measured a handful of J201's and found the average to be -0.83v.

So in most cases, the drain-voltage (Vd) to give the J201's the most 'tube-like' distribution of harmonics would be 11.11v. JHS probably biases right at Vd=0.5*Vss (9v) like in the Superbolt, but this just sounds sweeter, albeit a little lower gain.
 
If anyone else is building one, I'd recommend trying out biasing using RunOffGroove 'Triode Emulation' formula.

A closer look at the Fetzer Valve
View attachment 3697

Vcc is supply voltage -- The 1044 puts the supply voltage (from a typical 1-spot supply) up to 17.55.
Vp is the pinchoff voltage of the JFET -- RoG measured a handful of J201's and found the average to be -0.83v.

So in most cases, the drain-voltage (Vd) to give the J201's the most 'tube-like' distribution of harmonics would be 11.11v. JHS probably biases right at Vd=0.5*Vss (9v) like in the Superbolt, but this just sounds sweeter, albeit a little lower gain.
I biased mine a little under 9V, I'll have to try the 11.11
 
Well I noticed that too but didn't want to appear too harsh. I was wondering about how mauve ground wiring might affect the sound. Does a ground know it's a ground when it's mauve?

I don't know about you guys but these are the things which keep me awake at night.
 
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