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Original Message

RE: Help With Futterman Mono Amps

Posted by Lew on March 8, 2016 at 20:15:26:

If you still don't know exactly what model this is, I think they are H3a's. As I recall, the H3a had the single huge output coupling capacitor that you have on your units. This was eventually replaced by a gaggle of much physically smaller photoflash caps, 6 of them per chassis, IIRC. That version was re-named by Futterman as "H3aa". That was the end of the line. In consecutive order, I owned H3a's, followed by H3aa's, the latter bought direct from JF. Since you seem to know what you're doing, I am sure you would know to replace all those electrolytics. In my Atma amplifiers, I use a bunch of Panasonic TS-ED electrolytics, 2000uF/200V, for filtering the output supply, but they would also be useful as output coupling caps on your amplifiers. Also, I wonder whether 36KD6 or 40KD6 could replace the 6LF6s. That's just a WAG.