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Genuine Thru hole j201 are rare like hen‘s teeth. Most of the them on Fleabay are relabled new ones from asia or discarded old ones.

No.

Maybe you can rub the LED with steel wool or scotch brite.

Yep.

I recently socketed a BSIAB which calls for 3 stages with those jfets. My experience was that the 2n5457 and thd j201 had a slight difference in gain, but the mpf102 was remarkably lower that the other two. I settled with the 2n5457 being in the middle.

Good move!

I think the newer boards are carrying numbers like pcb407, which can be used in the search function.

From my notes: Most popular Rat subs CA3130 - Slew = 10V/µs; MOSFET (In & Out) Ratsub mids push LF356 - Slew = 12V/µs; FET Ratsub LM301 - Slew = variable; BJT Ratsub HiFi LM307 - Slew = 0.4V/µs; FET Ratsub LM308 - Slew = 0.3V/µs; BJT Rat LM709 - Slew = 0.25V/µs; BJT Ratsub LM741 - Slew =...

Should work fine with 9volt source up to ±7.5 volt.

I checked the specs with the different modules offered. On the fixed output modules they stated that the input should be 2.0 v higher than the output.

The TL072 isn’t a dual Op amp?

Hfe depends on the current in the circuit (and on the testing device).

I always do Drill > Primer and sand (2 times) > Paint > Graphics (screen print) > Clear Coat

There is a youtube vid with 8 chips in a rat circuit. The op07 was a bit briter and modern. My fave was the TL071.

Good to know. As i understand in most cases not every single output on power supply is completely isolated from each other on a own tap of the transformator. The VL PP2+ it seem to have 1 to 4 on one tap, 5+6 on one and 7+8 on another. The 4x4 seem to have 4 different taps.

You have to dump the charge pump first, but yah right, you need +18v and -9v for a Kliche.

Maybe it's very outsided advise, but thats what I do to get 18v for a pedal. I bought an voltage doubling cable from Voodoo Lab, which is optional for the Voodoo Lab pedal power 2 plus. No troubles with oscillations.

Yes, that's right. I stand corrected.

It's an OCD derivate, if I remember right.

I like my 5F1 clone at lower volume in the raw mode. I do this with switching the standard NFB resistor to a 1meg resistor via a pull push pot. The 1meg resistor gives me a very tiny amount of feedback. This helps to dampen peaks a tiny bit. Since the 22k resistor is a kind of middle way...