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In Reply to: RE: Pilot SA260 amp Power Transformer toast? posted by Kirk57 on January 16, 2017 at 07:46:49
Original condition photos of both top and underside, please.
Eli D.
Follow Ups:
Bottom views: I didn't take one of the whole thing, but here are three shots that include everything. It was a mess, as you can see.
The perfboard with the diodes (which I think replaced the selenium rectifier) and some of the other work was done by a local tech years ago.
Top view: not mine, but it's the same amp:
http://i28.photobucket.com/albums/c207/whitese/pilotsa260.jpg
There are 2 "twistlok" (can) caps. whose diameters need to be measured. You will be increasing the amount of capacitance in the reservoir (C1B) and decoupling positions (C2A/C2B) using modern, clamp mounted, parts. Obviously, the clamp sizes appropriate to the chassis holes already present need to be acquired. I will "ping" Jim McShane to get his input on the subject.
Remember, C1A is being replaced by a film part that's cemented into place on the underside of the chassis.
BTW, I see only 1 diode in the bias supply. It was a nice touch on Pilot's part to full wave rectify the bias supply. Perhaps that area should be gone over too, since corners may have been cut.
Eli D.
The smaller twistlock can is 1" in diameter, the other is 1 3/8". Both are currently empty (I cut them apart and cleaned them so they could be stuffed with new caps as needed)
There is a second diode, hiding under the wire on the perfboard.
Stuffing and "gooping" is OK, but clamps are definitely more secure.
Let's see if Mr. McShane posts.
Eli D.
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