Why don't you guys always re-resistor / recap the MP-1 input stage?

[luffliffloaf]

How come the noise mods don't upgrade the input stage R85 - R91, as well as C35, C36, and C38? These are near tube heat, and several of my resistors drifted and the caps have high ESR. I would think upgrading these resistors to 1/2w 1% metal films and upgrading the caps to better ones would be standard procedure?

[rnolan]

Good question

[MarshallJMP]

So how much did they drift? Also what was the ESR of those caps? Must say never had a problem with these.

[luffliffloaf]

Well unfortunately those tiny resistors went out in the trash a few days ago. I want to say, if I remember correctly, that R92 510ohm was around 700 ohms, and one of the 1M possibly R90 resistors was 1.2M. Also R72 200ohm was around 220ohm. Of course this particular MP-1 appears to have literally been run over by a car, so there's that.

[MarshallJMP]

ok that's  a bit high although it won't affect anything. There is also no need to use 1/2W resistors for the 510 en 1M resistors, there's no current going through these.

[luffliffloaf]

I know, but I'm slowly replacing every capacitor and resistor in the thing, and I have a surplus of 1/2w metal film resistors lying around. Might as well use them up.