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Frankenstein Head replace electrolytic captor on reverb board [message #26188] Sat, 10 June 2017 12:30 Go to next message
craig h is currently offline  craig h
Messages: 1
Registered: June 2017
Junior Member
The black electrolytic captor on the reverb board is cracked and needs to be replaced. I cannot read the writing on the cap. looks like (25v ?141384-002)? app. 1-1/2"x5/8" What would be a good replacement cap? I have pictures but I don't know how to add them to this post. thanks craig
Re: Frankenstein Head replace electrolytic captor on reverb board [message #26189 is a reply to message #26188] Sun, 11 June 2017 06:07 Go to previous message
stevem is currently offline  stevem
Messages: 4207
Registered: June 2004
Location: NY
Senior Member
There are 6 electrolytic type caps that should get replaced on that board.
The main cap is 500 uf, then there is 3 10 uf caps, one 25 uf cap and then another 500 uf cap.
The main cap can go up to 1000 uf if you like , the main cap should go up to a 75 volt rating and with all the others 50 volt is good.

There are many white or black cased Mallory brand caps on the boards in these amps and many times they are in such bad shape that one pops open , or they swell up .

If it where me while I had the amp apart I would change them all out!
Also on these amps the bias resistors on the output Transistors on the rear wall off the amp drift in value due to age and heat.
This can make for as little as 60 watts of clean power from these amps when they should top 90 watts into a 4 ohm load.

[Updated on: Sun, 11 June 2017 06:08]

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