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I popped a MP10A with hfe 28 into a Dragon Breath Boost. Worked!

My first thought with squealing complains is, has this circuit a charge pump? What charge pump and what happens with another IC and what happens without the IC in the circuit?

by zooming at the upper right of the last pic.

Your hard clipping diodes look completley shot. No wonder your original pcb sounds less compressed!

ST-9 (or any YATS) into informant

I looked for the Mk-168. The specs look quite promising for 25 bucks. Features: 2013 the latest version of the software, the function than the M8 version more. Microcontroller using 8MHz external crystal, a better measurement accuracy. Key resistance using a thousandth of a metal film...

My board is changing constantly, but i always have a tuner and a noisegate.

Like the TL074 and other quad amps its often used in multistage preamps and equalizers.

I bought a schatten winder 10 years ago and did some repair work. I rewound a humbucker coil and repaired several strat pickups. Then i got bored and sold the winder. Does that count? One good advise: Get some of the thinnest fishing line and try to practise winding on coils. This helps you...

Just a hint: There is an old special tube called 12dw7, which one side 12at7 (ecc81) and the other side 12ax7 (ecc83). Some years ago JJ released the new ecc823 and reversed version the ecc832. The latter one would be a great tube for a cathode follower circuit, which brings a ecc83 into a ecc81...

Reverse wiring a A25k?

I had the same problem with a switch, the hot solder ran down and caused a short. I solder every switch tab just on two points where the tab is near to the board.

Definitly i will order some JRC 4558 next time - just for s&g, but i ran out of TL072s. Interested also in the TL082.

First and foremost: use sockets. The hassle to solder them opamps in and out is not worth to save the costs of a socket.

… and white nylon washer eeeeh

Glad you got it sorted out!

These charge pump are a source of squeal sometimes. Sometimes they are fakes, sometimes they are defective and sometimes weird interacting with other parts like buffers or other charge pumps happen.

I follow a certain procedure to mount the pots, i read here somewhere. I mount the pots very loosely into the box and fit the pcb over the legs. After checking everything i fix the pots with the nut and solder them. This procedure can even out some inaccurate drillings or slight differences.

I recently started to measure all my caps. Those small ones have a rather wide spread.

I like to team the GEs up in series with 1N400x. It takes the threshold higher and preserves the characteristics of the GEs.