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They're $4.75 at smallbear.

Oh wild! A photo diode?

It just looks like it was made to fit either lug or pcb style pots.

https://www.amazon.com/Apple-inches-MacBook-Display-Dual-Core/dp/B08156M1LH/

You can get a nicely-spec'd, previous-gen macbook air on amazon for about $500 which based on your use-case (basic graphic design? PCB layout in CAD?) will be more computer than you'll ever need.

@Robert just curious if you'd had a chance to poke around inside this one yet? VERY CURIOUS

'Discrete' means that it's put together out of individual components rather than a 'monolithic' op-amp, which is one of the little black boxes. ie, a monolithic TL071 has a couple dozen resistors, transistors, diodes, caps, FETs packed inside of it; ostensibly a discrete opamp gives you control...

The separate cut/boost controls on each band is a pretty classic aspect of the Pultec EQs. Boosting and cutting the same frequencies doesn't end up being a net-zero, the frequencies aren't exactly the same nor is the Q. So you get interesting interactions in a particular area, which is part of...

Are you looking for a clean boost with a relatively high input impedance or are you looking for an always-on buffer with a switchable boost or is the whole thing going to be always on? How much volume boost do you need?

Why not just put a few washers on the tayda one so the nut sits flush with the end of the jack?

Going to take a wild guess and say that someone re-used an enclosure that had a slow gear clone in it.

There's no way that's a slow gear.

Tayda won't have the Ge diodes, unfortunately.

The knobs and artwork look really nice!

If using the same amp consistently, check for DC leak coming from the amp? Something with the power supply in your house? LED lights/dimmers on the same circuit? Too close to a computer monitor?

I'm not sure exactly what the recipe is for the flux in flux-core solder wire, but suffice to say it is at best pretty toxic and at worst super duper toxic. Boric acid (aka borax) is a very common one for low-temp silver brazing, short term side effects are pretty common ('foundry flu' or 'flux...

It doesn't get any simpler than a naga viper: https://www.pedalpcb.com/product/pcb402/

Just curious - when you were noticing changes to the sound of the pedal with differerent diodes, were you checking to see the changes in voltages?

I'm not sure what mods you've made from stock, but in my experience hfe and leakage aren't particularly important in tone bender MKIII/IV variants. It's the sound of one amp stage slamming into another, and the distortion comes from Q3 being (and this is a technical term) "blown the hell up."...

Tone Bender MKIII/IV are probably one of the most forgiving vintage Ge circuits and (imo) the best sounding tone bender.