SOLVED/Mod - PC-2 Decay range

The range of the decay pot seems to be at max by 12 o'clock. I see one other user mention this in another topic and am wondering if this has been experienced by anyone else? I presume the decay times can be modified but its the range concerning me most. All parts have been correctly identified including pots.

Today I spent some time working on this and trying to get a better range with the pot with no success except finding that increasing C7 extends the decay - without effecting the range of the pot. I went with 10uf for now, its extra long but still snappy at fccw, still with a short range its not great.

Next I found a copy of the Boss service manual to confirm that the decay parts we have in the Yocoto are correct and I noticed 2 resistors are different R9 & R10 both 47k in the Yocoto where the Boss schem shows 4.7K (R14) & 4.7M (R16) both part of the decay circuit.

Tomorrow I will try these resistors and see if it effects the range.

can anyone confirm that they have a good working decay range? The one I'm working on is at its max by 11 O'clock and has nothing change after all the way cw.

Change R9 to 47k and R10 to 820K. Keep C7 as 2.2uF. It became a bit of a play off between trig interference from the other instruments so I lowered R10 from 1.5M to 820k which gives a good pot range, minimal interference with a nice snappy decay through to extra long.

serum114 wrote:Change R9 to 47k and R10 to 820K. Keep C7 as 2.2uF. It became a bit of a play off between trig interference from the other instruments so I lowered R10 from 1.5M to 820k which gives a good pot range, minimal interference with a nice snappy decay through to extra long.

Thanks for sharing!

No problem. I couldn't bring myself to pass it on to its owner without working the issue out.

This is an awesome mod. Thank you!