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@Synchrony Pedalworks - you have to reverse the polarity of the C101 capacitor. Also - there's no filtering cap connected to 9V - (pins 1 and 8 of the charge pump). You have C101 on the negative rail, but no el cap on the positive rail. Another issue - potentiometer footprint overlaps with...

I'm sure.

Paths and vias unnecessarily so close to the pads. You have plenty of free space available.

According to the schematic, IC2.1 is a terminated, unused opamp. Did you change it to a buffered Vref?

Looks like 0805.

With a reactive load it will be as if a speaker was connected, only without the speaker :) Reactive load emulates interactoin betwen output transformer and speaker. Here's the frequency response of the above circuit: with and without the reactive load. I recommend trying another circuit -...

The output power is 100mW. This is a fully functional circuit - I don't see the point of modifying it and messing with MOSFETs, increasing the output power, just to use a load instead of a speaker. In this case, the lower the power the better. You will still need a load if you only want line...

This.

Not necessarily... For example - mmbf5457 from one tape, I unpacked about 20 pcs. Vp between -1.4V and -1.6V. It all depends on how small a spread you need.

Here's a recording - Unison in stereo. Two modes: dual detune and double take with different settings of the MIX (noon and max position) and TIME (9 o'clock, noon, max) knobs.

Pseudo stereo. One channel with all the effects, one channel with dry signal.

Finally boxed.

That's correct. Here

I just uploaded the schematic to ltspice. RS = 12k and J201 with Vp -0.7V requires RD of 105k to get 4.5V on drain. With RS 1.2k RD is 20k (for the same transistor).

In the case of J201 and a 12k source resistor, a 50k trimmer may be too low. You could try 100k. The higher the RS value, the larger the RD value needed to get the same drain voltage. Maybe the original has a larger trimmer? Or maybe a different JFET? Or 1.2k instead of 12k?

In the vast majority of cases, the physical dimensions will be more important here, so that they fit the footprint on the finished board. Power rating would be important for example for the output transformer in an amplifier.

From what I remember they differ in maximum output power. TL - 75mW, TM - 200mW, TU - 460mW.

Bump...

I have a design for a similar box but I keep forgetting to make it :)