OTL Asylum

NYAL OTL 1 Julius futterman repair.

72.69.200.191

pennyford

Hello
Wondering if anyone knows of any active Tech that has experience with NYAL Julius Futterman OTL 1 Amplifiers.
I am in the NYC area.
Thanks

Edits: 11/02/24

Follow Ups:

Ben Jacoby - High End Audio Repair - Bill Way 08:35:40 01/24/25 (1)
He lists Futterman on his web site. He did some really good repair/mod work on old VTL gear I brought him. He is a delightful character. Find him at highendaudiorepair.com

WW
"Put on your high heeled sneakers. Baby, we''re goin'' out tonight.
- http://highendaudiorepair.com (Open in New Window)
- Thumbs up on Ben. - The Killer Piglet 08:58:49 03/02/25 (0)
  Also did some repairs/mod work on my AN DAC 3.1x after the power transformer burned out.
  Replaced it with the M2 PS.
  Excellent communication.
  KP
  
  Edits: 03/02/25
RE: NYAL OTL 1 Julius futterman repair. - airheadair 19:56:13 01/02/25 (0)
Isn't the OTL1 the version that comes with a regulated B power supply, required a total of four chassis?
Will this be even remotely possible to deal with now?

My OTL3's are still doing pretty well, I think, but did get a tune-up by Roger Modjeski, who is no longer with us.
RE: NYAL OTL 1 Julius futterman repair. - rhinohifi714 07:53:35 12/03/24 (0)
I have a friend who lives in Jersey that worked as a Tech with George Kaye at moscode, he could go through it and repair any faults.

if you would like to get his name and number just send an email through this sight.

Bryan
RE: NYAL OTL 1 Julius futterman repair. - pennyford 16:42:45 11/02/24 (0)
I don't know much about techs to be honest
Contact details would be nice if you have it
Thanks
RE: NYAL OTL 1 Julius futterman repair. - Lew 12:48:01 11/02/24 (6)
George Hammond is not around?
- RE: NYAL OTL 1 Julius futterman repair. - pennyford 16:56:12 11/02/24 (5)
  i presume you mean George Kaye......if so i just spoke to him and he said he was retired and did'nt work on them anymore.....said he would look for some literature and forward it to me.
  
  Still looking for and active tech....thanks
  - RE: NYAL OTL 1 Julius futterman repair. - rogerh113 07:51:43 11/03/24 (4)
    I have recently completely rebuilt a Futterman H-3, and have a couple of observations that might be of help.
    
    Apparently the OTL 1 uses printed circuit boards rather than point to point wiring. In some ways that is good, in that it eliminates poor wiring work, but on the other hand will likely require the removal of the PCBs for repair. Not so big a deal, and pretty typical with 'modern' amps.
    
    A capable tube amp tech (used to dealing with high voltage tube systems) could likely tackle the job, but it is likely going to take quite a few hours. A lot, or most of the parts, are quite old and will not likely stand up to any stress, and the audio performance will not be as good as they could be. Possibly just a complete replacement of parts would be more cost effective than troubleshooting a bunch of marginal parts - up to the tech, but a consideration. That would at least give you a bit of a bullet proof amp.
    
    The power transformer in my Futterman had failed, and had to be rewound. If you proceed and need the rewinder name, I can provide that.
    
    It would be useful if you have any documentation for the amp, such as a schematic and the biasing instructions. If you do not have them, they may be posted on the web, or another OTL 1 owner may be willing to send you a copy.
    
    Generally the restoration of an old amp is a labor of love, rather than an economic decision. Sort of like an old collector car. The cost of the amp and then repair is likely to be higher than the final market value, unless you inherited the amp.
    
    Hope that helps a bit. The Futterman amps are not so exotic that they cannot be understood and repaired by someone with documentation, motivation, and tube amp/high voltage skills.
    
    regards -- Roger
    - I have a schematic... - Lew 11:22:49 11/20/24 (3)
      for the original Futterman circuit, before the modifications introduced by NYAL to the Futterman design. It's very large in size, and I would have to figure out how to cram it into a page, but I am more than willing to share it. It probably is applicable to the Harvard amplifiers.
      - RE: I have a schematic... - pennyford 11:54:46 11/21/24 (2)
        
        In Reply to: RE: I have a schematic... posted by Lew on November 20, 2024 at 11:22:49
        
        Hi there. Thank you for the response
        Yes, that is for a different amplifier.
        
        Futterman H3a and H3aa schematics - Lew 11:09:27 02/03/25 (1)
        
        In Reply to: RE: I have a schematic... posted by pennyford on November 21, 2024 at 11:54:46
        
        I am quite sure that Julius himself gave me these schematics.
        
        Second try for H3aa schematic - Lew 11:12:05 02/03/25 (0)
        
        In Reply to: RE: Futterman H3a and H3aa schematics posted by Lew on February 03, 2025 at 11:09:27
        
        I don't know why both schematics were not attached to the first post, but here goes again.

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