OTL Asylum

RE: Futterman H-3 restoration

135.180.105.29

33dot33rpm

A

In Reply to: RE: Futterman H-3 restoration posted by rogerh113 on March 05, 2024 at 09:52:52

Thanks for the info Roger.

Good luck with your H-3!

I agree with you that the original build quality left a lot to be desired. My amp had been worked over by someone else and that added to the poor wiring job. In my case I decided to leave the CC resistors in place if they tested within reason. I replace all the electrolytic, paper and "plastic" caps but retained the small "dog bones". In the process of replacing the remaining diodes.

Please keep us posted on your progress as I will mine. If you have any photos of your rebuild it would be much appreciated.

Cheers Ed

Follow Ups:

RE: Futterman H-3 restoration - rogerh113 14:19:07 03/05/24 (0)
Some in progress detail under the wires...
RE: Futterman H-3 restoration - rogerh113 14:09:18 03/05/24 (0)
The top
RE: Futterman H-3 restoration - rogerh113 14:05:21 03/05/24 (2)
Hi Ed,

Here are a couple of pics. Wired in on the bench, so access not ideal, but should give a sense of things. I have passed signal through it, so it does seem to work. Need to go through the power tubes (some bad ones in place based on voltage setting level on one side). Just have to spend some time. Can't see it, but I did install an IEC power socket.
- RE: Futterman H-3 restoration - 33dot33rpm 08:43:29 03/07/24 (1)
  Kudos to you, excellent work and quality parts!
  - RE: Futterman H-3 restoration - rogerh113 09:14:12 03/07/24 (0)
    Thanks. My objective was to hear what a respected, period OTL would sound like if brought up to optimal (in my opinion) standards. I build a SET amp before, under the same objective, and am very pleased with the result.
    
    Hopefully I can hear the OTL soon, if a bunch of other high-priority projects stop coming up around the house. Given that I am listening to the SET, and it is unclear how that can be bettered, I don't feel under any pressure to complete the OTL.

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