I at long last ordered some 500K Log pots, maybe CTS, but the number on the pots does not show on their site, and googling does not find the pot number. I did check with the multimeter, roughly, they are Log, maybe 10% Audio, but ideally I need to mount one to a backing plate, draw out positions accurately, and then measure the taper. What bugs me, is that the normal pin-outs (left = in, centre = out/wipre, right = ground) as viewed from bottom side, does not make sense in terms of resistance compared to CTS diagrams. Never mind, wired up with clockwise = full volume, counter clockwise less volume. The last bit of the travel to maximum volume is rather drastic in volume response. Should work for players who need fast volume "swells". Could be handy when doing a quick solo in a song. Or driving the amp from "music" to "noise".
It being late at night, and feeling brave (with no liquid anti-stressant within reach), I removed the old, small 100K pots. The Tone pot fits with no hassles, but I had to "slot" the hole for the larger diameter Volume pot, to allow clearance from the plug and wires. Not what I like to do, but no options here. I wired up everything as standard, but with a new 0.01microFarad tone capacitor. Sounds did emanate from the amp. But the tone control was kind of, well, weak. Bright sounds went to slightly less bright sounds. Not enough.
Before starting to fit a bigger capacitor the next morning, I verified that the wiring is as internet sources for Tone Pots show. It is not, refer to the diagrams in the previous posts. I re-wired it to the "conventional" (?) layout, with the input from Volume pot on wiper (lug "2"), capacitor on lug "3" (bottom view), connected to ground, lug "1" open. I had good control now.
Confidence at a high (and thinking ahead to a celebratory drink..), I made up a new Treble Bleed thingie, using the "Kinman" layout, with a 120K 1/4 Watt resistor and 0.001 microFarad capacitor. (The values he lists are not standard values.) Works OK. I shall play for a while to hear if I like it in the longer term - I have some picoFarad range capacitors if required, but, still, no stash of resistors to play around with. Ideally I should find said stash, and compare all the styles of treble bleed wiring.
The picture shows it all. I leave the leads long on purpose, I would like to be able to re-use the components in future, if needed, and cutting the legs too short sort of makes that a remote possibility. Ah, caught out? No, the 1/4 Watt treble bleed resistor is in that long black heat shrink sleeve. Apologies for the koki-pen on the Tone pot, that was the marks I put there when I first measured the taper and decided where what goes. I was wrong, and I re-marked. You are, of course, correct: I should clean it off.