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In Reply to: RE: Help With Futterman Mono Amps posted by Toto on April 01, 2015 at 09:36:25
As an update they were not water damaged as a previous inmate thought. Just surface patina which is being cleaned up now. Generally I do not like to repaint old amps as I like them to look weathered and in as original a state of appearance as possible. It blows peoples minds when they see an old piece of electronic equipment that makes the sound these amps can make after a rebuild.
I am also think 17KV6A tubes as a replacement to the 6LF6's but again I am in the testing phase so we'll see. 1 amp is stripped already.
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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.
I just came across this posting and I can confirm the H-3a use the 4 per channel 6KG6A/EL509 and have the 3 large caps. Julius delivered my amp after he repaired it and we listened to some music ( KLH Model Nines).
Some of the H-3a chassis used the H3 chassis which had on the front left, TECH Instruments Corporation and on the right front, stereo/mono OTL power amplifier. I've had this particular OTL since 1972 and its still powering the Nines. People who say the Futterman is unreliable maybe had bad luck or abused the unit. I also think the Model Nines still stand up to anything made today, the pairing is beautiful and engaging sonically.
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