Source for Golden Tube SE-100 Power Transformer?

Discussion in 'Tube Audio' started by Geek, May 15, 2018.

  1. Geek

    Geek Nerd

    Messages:
    169
    Location:
    Fraser Valley, BC
    Hello,

    Got a GTA SE-100 with a smoked power transformer. Two open secondaries I have no idea the voltages (any help? Maybe I can meke an off-the-shelf sub). All voltages unloaded.

    Pri: Blk/Wht -120V
    Sec 1: Grn/Yel - 605V (HV)
    Sec 2: Blk/Wht - 357V (Scrn)
    Sec 3: Red/Yel - 40V
    Sec 4: Red/Blu - 6.9V (heater)
    Sec 5: Red/Blu - open
    Sec 6: Red/Blu - open

    Any ideas what the open secondaries should be or better, a replacement source?

    Cheers!
     

     

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  2. BillWojo

    BillWojo AK Subscriber Subscriber

    Messages:
    2,612
    Location:
    Burlington, NJ
    There is a Yahoo users group dedicated to this amp. I would join that and see if anyone there can help out.
    Seems that there is a lot of issues with these amps as they have a bunch of mods to make them reliable.

    BillWojo
     
  3. Geek

    Geek Nerd

    Messages:
    169
    Location:
    Fraser Valley, BC
    Hi Bill,

    There was a Yahoo group. My bookmarks for it come up 404 and its existence isn't found by Google ot Yahoo Groups search :(

    Cheers!
     
  4. 6DZ7

    6DZ7 Super Member

    Messages:
    2,009
    Since 4,5,6 are all the same color I'd bet they supply the same. How could anyone know which goes where if they were different? Is #4 on the same winding as 3?
     
  5. Geek

    Geek Nerd

    Messages:
    169
    Location:
    Fraser Valley, BC
    Given my experience with GTA and that B&W are one primary, one screen, I don't trust the colour coding.
    The two bad secondaries were off the board when I opened it. It had been serviced before by ... ???
    The schematic I have for this thing is so inaccurate, I don't trust it either.

    Thanks!
     
  6. 6DZ7

    6DZ7 Super Member

    Messages:
    2,009
    What's the ground? Just one bare wire?
     

     

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  7. BillWojo

    BillWojo AK Subscriber Subscriber

    Messages:
    2,612
    Location:
    Burlington, NJ
    I'm surprised about the Yahoo Group but I just did a quick search of my email and found that the last post I had from it was on 12-23-2017. It's listed as defunct in my groups list as well. If you were a member you can pull up all the old post, I tried it but I'm not sure if they are search-able.
    I wonder what happened to it.
    A few years ago there was one listed on Barter Town at a good price and I joined the group to learn more about them. After seeing all the problems I decided not to pursue it any further. Seems with a number of mods they can be made to perform well. I do remember that there was a company that sold kits to bring them up to spec. Not sure who it was but they may be able to help.

    BillWojo
     
  8. heyraz

    heyraz AK Subscriber Subscriber

    Messages:
    1,808
    Location:
    Long Branch, NJ
    Sonic Craft had kits for the SE40
     
  9. Geek

    Geek Nerd

    Messages:
    169
    Location:
    Fraser Valley, BC
    OK, I've shot Sonic Craft an email :)

    @6DZ7 - No, it's not a CT'd transformer, it's two wired per for bridge.

    Cheers!
     
  10. 6DZ7

    6DZ7 Super Member

    Messages:
    2,009
    Hope you can get the OEM. That's a unique one for sure.
     
  11. Geek

    Geek Nerd

    Messages:
    169
    Location:
    Fraser Valley, BC
    Thanks, 6DZ7!

    And thank you all for the assistance. I will also contact Toroidy.pl to see if they can rewind it. The client seems to want it fixed, so I have to exhaust all possibilities before engineering a new PSU :(

    Cheers!
     

     

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  12. BillWojo

    BillWojo AK Subscriber Subscriber

    Messages:
    2,612
    Location:
    Burlington, NJ
    Looks like the Yahoo group is back up.

    BillWojo
     
  13. Geek

    Geek Nerd

    Messages:
    169
    Location:
    Fraser Valley, BC
    All I'm seeing is the SE-40 group. Can you give me a link?
     
  14. BillWojo

    BillWojo AK Subscriber Subscriber

    Messages:
    2,612
    Location:
    Burlington, NJ
    Join that group and ask the members. It's the only Golden Tube forum that I know of. Hopefully they can be of some help.

    BillWojo
     
  15. Geek

    Geek Nerd

    Messages:
    169
    Location:
    Fraser Valley, BC
    Thanks muchly! I've joined.

    Cheers all!
     
  16. Bob

    Bob AK Subscriber Subscriber

    Messages:
    1,936
    Location:
    West coast
    golden_tube@yahoogroups.com

    there are trafo companies that can rebuild blown transformers. this keeps the form
    factors consistent.
     

     

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