|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
50.0.192.209
In Reply to: RE: Futterman H3 amp 'upgrades' posted by rogerh113 on August 01, 2019 at 19:31:10
Ok - Glad that you found lots of useful info on the H3 amp-
Yes - this is a 40+/50+ year old amp-
Some parts age poorly, others faire better
Caps, old Diodes, carbon Comp resistors do not always survive the ravages of time well-
Should you own this amp for - say 10 years - even if you do not use it/upgrade/restore it -
it will need this work to make it useable - to hear the magic of Julius' work/design
On the other hand, you do the work, come to love and enjoy them amp, when you sell it- you sell it with a story - how you researched the circuit, parts, rebuilt it, bought extra tubes, and enjoyed it driving your speakers - bringing you hours of joy as it rendered the musical signals -
You bought it for a reason- follow through
You will not regret it
Amongst other equipment I have a few sets of Quad '57s - I am rebuilding the high Voltage boards-
Next the crossovers-
I hope to set two pair up - stacked - and listen to that fabled sound-
They will not be stock-
when I sell them, they will be 50-60 years old
But the transformers will still be sound, and if I need to I will rebuild the membranes - they are worth listening to
so is a Futterman H3
Have fun
and enjoy the music.
Happy Listening
Follow Ups:
That is pretty much exactly the way I am looking at this - sort of no way of getting around all of the work and effort if you want to hear a real Futterman.
I also think I would enjoy the journey as much as arrival at the destination, which I guess is essential with a project like this.
Through searching for the last few days, I have still been unable to uncover a schematic of the original Futterman H3, which is a bit of a concern. Perhaps that is not so relevant, and only a starting point, since I gather each H3 was different, and that individual uniqueness (tuning) needs to be understood and retained. I can likely construct a schematic based on what is in there, assuming it is still intact and nobody has done anything to it before. It looks unmolested....
that I think Julius gave me. I'll look for it. Separately, I also have a schematic for a giant Futterman amp that was built by a friend with Julius' advice and input. It has 8 output tubes, and I think that may be the only difference between it and an H3. The problem with that one is that it is huge and framed. I hate to take it out of the frame, but I may be able to photograph it and send you a copy.
Did I miss it, or is there no on/off switch on the amp? Is the intent to leave it on all the time (hard to imagine) or to pull the plug from the wall when you want to turn it off? I realize it is old, but it certainly does not predate on/off switches.
Always interesting to see what is there (or not).....
I cannot recall whether my made-by-Julius H3aa's had an on-off switch. In those days, it was often the custom to control the ampifiers via switch-able female AC outlets plugs installed on the back of the preamplifier. You could switch the amplifiers on and off from the front panel of the preamp. Modern purist approaches have done away with that custom, pretty much. I do know for sure that my ca 1980 Beveridge amplifiers were originally switched on and off via the front panel of the Beveridge preamplifier, for one example. I guess McIntosh used that system for ages, maybe even now. I had to install on/off switches directly on the Beveridge amplifier chassis's.
Thanks very much for the clarification. Back in my 'youth' I had integrated amplifiers, so all of this was a moot point. It is interesting how they did it, and possibly would not go down well with the quality power cord advocates (of which I am one).
regards -- Roger
Thanks very much. If you can find the schematic, I would very much like to get a copy.
No need right now for the 8 tube version - I will remember about it and ask you if I need a copy. The house is already pretty jammed with stuff.....
thanks -- Roger
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: