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Probably because it was 2013 but the main schematics are in the threads

PP1045SB at Digikey comes up with the EWA number but for me lists it as non-stocked. But at least it identifies EWA as a Panasonic...

I found this thread in a Roland VS-840 user forum about replacing volume pots: "I traced the circuit and the pots are simply voltage...

I don't know who made the originals. Alps, Noble, Alpha were common brands. Look again at the data sheet g1 posted. Do you realize...

Thank you for pointing out my error...I am (more than) a bit befuddled by all the details involved in sourcing the correct replacement...

But look at the data sheet g1 posted for your PTA series part. The pins are two directly on one end and one directly on the far end. The...

Next I would check voltages to see if you have the right (or at least reasonable) voltage rails for the power amp and preamp.

Local copy:

WD-40, huh? Well, I'm glad that stuff's good for something. I certainly don't use it as a lubricant - Well, maybe on a screen door or...

Yep, tried the return on the FX loop (nothing), and tried going line out to another working cab (nothing). Haven't been able to locate my...

You replied back while I was adding something to my post, so putting it here instead. Assuming you have an effects loop try plugging...

No offense taken, mainly because you are right. Not sure why I had G3 in my head all these years. This was a special camo series, but it...

It is true, the #3 post and the picture to the right hand side is the one that is recommended by Syntaur as a replacement pot. I was under...

No offense, but are you sure that is a G3 and not a G2? I can't find any pictures of a G3 with front graphics that look like that. All the...

I see no reason to believe there's a tube inside: Randall RG75-G3:...

Greg, thanks, that perfectly answers my question about the diode rating and that the ~600R source impedance is enough. Is there simple math...

I think a whole volt difference between your + and - 16V is a bit much (you said +16.2/-17.3) Your TR8 and TR10 base voltages should also...

I guess you mean IC rather than F&T ?

pdf of old 515 and mod attached

That file in post #2 of the linked thread is not working. The picture of the schematic in post #6 works:...

Why these? One of the more critical aspects is that the pins line up with the holes in the board. From what I can see from the datasheet...

Why did you change all those parts? What does the distortion look like? Do you have a scope? If no scope, make yourself a "signal...

Sort of like having a guitarist and combo on a moving train that approaches you (as the listener) and then stops and reverses back and then...

First, sorry, I wasn't paying attention when uneumann replied above, thought it was you Gaz. Apologies to both of you. No need to worry...

Wouldn't the solvents in the clear just cause the existing grime to lift, run and smear... .... and make an unholy mess? Don't think...