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Just some forensics here: maybe that amp *had* usable reverb when new, but those trimpots got dirty/oxidized/grimy/you-name-it along the years.
There's nothing "magical" about "original settings", you set them wherever it works for you.
In fact almost nobody else uses such trimmers.
The one in the driver op amp is just that, sets the drive level: you set it as loud as possible without clipping, which sounds disgusting.
I think you may even set it to maximum and leave it there, unless the reverb distorts on loud clean chords, in which you set it back a little.
The one after Q4 controls the residual hum/buzz which most reverb tanks pick up, being electromagnetic.
*Maybe* this amp's design was tested by an uptight Jazz player, very pesky about his sound, who accepted not the slightest buzz at all.
I'd say, set it also to maximum and let the front panel reverb control be the judge, after all they are both cascaded.
Lower it a little only if the reverb tank feeds back or howls uncontrolably.
As you see, you *do* have enough reverb there, it just need a little setting up.
I repeat, do not get paranoid about "original settings", use the tools themselves provided for best effect (literally in this case)
I would not worry about that C10 ESR rating either, it's a small value cap in series with 4700 ohms or more, it's not a big filter capacitor.
Also remember you do not have a Twin Reverb there; getting usable reverb is more than enough.
Good luck.
There's nothing "magical" about "original settings", you set them wherever it works for you.
In fact almost nobody else uses such trimmers.
The one in the driver op amp is just that, sets the drive level: you set it as loud as possible without clipping, which sounds disgusting.
I think you may even set it to maximum and leave it there, unless the reverb distorts on loud clean chords, in which you set it back a little.
The one after Q4 controls the residual hum/buzz which most reverb tanks pick up, being electromagnetic.
*Maybe* this amp's design was tested by an uptight Jazz player, very pesky about his sound, who accepted not the slightest buzz at all.
I'd say, set it also to maximum and let the front panel reverb control be the judge, after all they are both cascaded.
Lower it a little only if the reverb tank feeds back or howls uncontrolably.
As you see, you *do* have enough reverb there, it just need a little setting up.
I repeat, do not get paranoid about "original settings", use the tools themselves provided for best effect (literally in this case)
I would not worry about that C10 ESR rating either, it's a small value cap in series with 4700 ohms or more, it's not a big filter capacitor.
Also remember you do not have a Twin Reverb there; getting usable reverb is more than enough.
Good luck.
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