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Got it, thanks. I'll probably use 2SC3503 that I already have.

Could someone reupload GG schematic?

Neat. Still curious about the currents through Q9 and Q6. Could someone measure voltage drop across R3 and R15? Thanks.

What's the intended current through Q6 and Q9? Simulated THD seems to be minimal (0.021%) at ~4mA. Still getting high 3rd harmonic (-64.5dB, the 2nd is -77.8dB).

Here is the layout I came up with. It's my first SMT board and I would appreciate some tips. The board is 85x100mm, traces are 30 (power), 20 and 12mil. SquareWave.pdf

Too bad. I was using a mechanical switch to short Bottlehead Crack output before powering it up to avoid the turn-on thump (as suggested by one of the designers on the BH forum). Guess I'll go with relay in series with the load and make SquareWave look into 300Ohm resistor for the first 30s.

More SquareWave questions: 1. Can the DC offset be stabilized with the output shorted to ground, e.g. closed relay in parallel with the load? 2. What parameters should the JFETs be matched for, Idss, Vp, Vgs(Ids)? 3. I'm designing my own SMT PCB (smaller 2-channel board). Can 2N4393 be replaced BF862 or 2sk209? Thanks.

Thanks. To sum it up: Two opamps. 402 ohm resistor. 1n914 is not needed. Two 1500uF caps can be replaced with one 1000uF. R16 can be changed to 100K from 1M. Wouldn't I need to change C4 (for 100K R16) to keep the same LPF behavior? Also, it seems that only R7 and R8 need to be 1/4W, am I right?

Could someone please post the final SquareWave schematics (or at least a picture of the PCB). I see some discrepancies in schematics/BOM/silkscreen published at http://tee8tee4388.blogspot.ru/2013/07/squarewave.html, e.g.: Schematics uses two opamps, but BOM and silkscreen have only one. Schematics and silkscreen have 402 ohm resistor, but BOM lists a 49.9 ohm one. BOM contains a 1n914 diode, but schematics and silkscreen do not use it.

Hello, I've added myself to the spreadsheet for 1x dynahi set. Hope there are still some boards left. Thanks.