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Thank you. The enclosure is from StompBoxParts - "Alexandrite" is the color. I had it drop-shipped to AmplifyFun where they drilled & painted it to my specs.

I was pleasantly surprised by the sound of the Nein Fuzz and intrigued by its use of JFETs. So I built it out and enclosed it in a decent wrapper. I did do some pre-measuring of the JFETs to target close to what was spec'd in the build docs. I went with anything was within ±5% of the specs.

I rather think that because the Ref voltage divider is comprised of two equal valued resistors (R19 & R20), I get the idea that the original +4V VRef is due to the orientation of D3 being in series, exacting a full 1V Fvd on the incoming DC, leaving the remaining +8V to be divided in half for...

It tends to give the signal a bit of a haircut; more like a cheap compression or signal smoother. It's a very subtle thing. But on harsh attacks you can hear the difference.

After finding the Kokko Distortion schematic, I traced the Kokko unit I had to check if the one I found is correct. My tracing matched the found schematic perfectly. But when I breadboarded it, it didn't sound like the original. I repeated the breadboarding a few times to be sure I was doing it...

From my understanding, device gain will typically be either voltage or current - except MOSFETs which typically have a fairly high voltage gain and near if not infinite current gain; but have a lower transconductance than BJTs. BJTs tend to offer higher current gain. JFETs seem to offer moderate...

BJTs typically achieve the highest overall gain, especially in small-signal applications, (even more so with Darlington BJTs), due to their high current gain and transconductance. However, the actual gain depends on the specific circuit configuration and operating conditions. For precise...

I already have a Vox NuTube amp and thought I'd eventually build a NuTube OD Screamer. I wanted it a bit different in that I wanted to expose the grid section of the NuTube device. It gets a nice glow when powered up. I musta measured 37 times for every possible way to mount the NuTube device so...

Tone generators on Apple devices typically output based on the device's volume control. Knowing the sig gen's voltage output will help verify what you read throughout the circuit's signal path when measuring. So you may want to measure the unloaded output of the iPad's signal generation so you...

Those seem to be right in the ballpark. So now you've removed suspicion from power supply and the tube. With the power on and no signal going into the circuit, what is the DC voltage at pin #2 of the tube? Then, with the power on and a 1kHz @ 1.0v signal at the input, what is the DC voltage at...

Yeah. The Fvd (0.35V) of the 1N5817 accounts for the difference between the DC jack and after that diode. What about the other voltages? (250v, VRef, etc . . . )

From the schematic you've posted, look at the "VIN" point on the 12AX7, should be pins #4 & #5. I'd also verify that the 250v supply is there. (Pin #1 or #6.) Yeah. Easiest test would be to swap the tube.

To check for consistent voltage supply values over time, simple test them a moment or two after firing it up, (so everything as time to stabilize), then again after a few more minutes. Then continue to check the voltages every 5 minutes or so. If the heater voltage on the tube dips too low, that...

Suggestion/POV . . . . whenever I get stuck and micro-focused on one small part of circuit when troubleshooting, I will often change that micro-focus to look elsewhere for the problem. In your case, I'd start looking at the tube and the stuff going in & out of it. But more to a more thorough...

Protection circuits are varied from poor to excellent and simple to complex. Here are a few examples . . . .

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Nein! Nein mit der fingerpoken undt mittengrabben!

Yup. The Nein Fuzz is a 'fuzz' circuit.

Testing either of two back-to-back clipping LEDs in circuit will not yield any definitive results. One leg of each LED needs to be lifted to test. At best while in circuit, if both are seated/oriented correctly, swapping the probes on the DMM while testing should display the same result. If one...