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In Reply to: RE: I don't believe that's an H3a in Rhino's photo…, posted by Lew on April 02, 2015 at 08:52:21
Yes, I think you're right. The previous photo is a mislabeled H3, mine are H3a's, and the later H3aa replaces the single large cap with six smaller ones.
Follow Ups:
For anyone who is interested in Futterman history, this website is great:
http://www.audioclassica.de/files/Dokumente/Die-Futterman-Story-2.pdf
The photos are surrounded by German text, but in the back there is an English translation of a description of a visit to Julius's shop in NYC. The author nailed it perfectly. That is exactly as I remember it myself. I was there at least twice. Julius was a sweet and humble man in all ways except one; he fervently believed in the superiority of his design for ESLs or for any high impedance speakers. Such speakers were more plentiful in the 50s and early 60s, before the hegemony of solid state amplification. Ralph and Julius have a lot in common.
This is the underside of one of the H3a's that I have. The Panasonic caps on the upper right (under the electrical tape) are not original to this build and were added later.
Edits: 04/02/15
That looks like a zener diode nightmare!!!
Julius used the zeners in a daisy chain to do the alignment procedure on the early versions of that amp, the pair that Ted and I did we brought them up to date using a single zener and an adjustable resistor, much easier, that amp has chains of 10 zeners in a row...WOW That's Beautiful!!!
I'm sure George will suggest a complete rebuild, that will be pricey but money well spent. They are awesome sounding amps.
I'll check the stereo amp for model number when I return home, I'm using it in my bedroom driving a set of Von Schweikert model 4's it has no problem at all driving them.
The stereo amp will put out 60 watts per channel, the mono like yours will put out 90 to 95 watts with a strong set of matched tubes properly aligned.
I doubt you would get that much power into 8 ohms. The downfall of the Futterman comes when the impedance reaches 2 to 4 ohms, which is sadly not uncommon in "modern" multi-way highly inefficient speakers built to be driven by transistors. I never perceived a problem with a true 8-ohm speaker, however.
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Edits: 04/05/15 04/05/15 04/05/15
in any case, I was just making conversation. I had no idea that my posts were offensive to you or to anyone else. Henceforth, I will be sure not to follow up any of your posts. I never even dreamt that I had a beef with you or you with me.
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Edits: 06/08/15
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Edits: 04/05/15 04/05/15
I just found a record of a similar pair, fully serviced and incorrectly identified as H3aa's, that sold on eBay in 2013 for $1782.32.
Edits: 04/02/15
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