OT for a 5d4 tweed super build

Discussion in 'Amp Tech Center' started by caspersvapors, Jul 19, 2019.

  1. caspersvapors

    caspersvapors Tele-Meister

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    I am trying to find out what current production OT is the closest possible to the original 5d4. Here is a picture of the original:

    https://images.reverb.com/image/upl...upersize/v1561452960/gm7dgj2likhprik9ucoj.jpg

    However I am unable to find out what manufacturer corresponds to
    "596"

    MM offers what they call an "early 50s tweed" tone clone model, however it is rated for 50 watts. I dont think the original 5d4 tweed supers were greater than 25 watts.

    Based on the desired output and comparing sizes from pictures I can find of vintage OTs, this oversized tweed deluxe transformer actually seems to be more in the ballpark of the 5d4:

    http://www.classictone.net/40-18090.html
     
  2. Wally

    Wally Telefied Ad Free Member

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    I would suggest talking to MM. I suspect that they have the ability to build an OT that would be built from a blueprint of the OT you need there. It will cost a little bit more than a ‘catalog’ tranny, but it will be built to the specs of one original OT that they blueprinted as they tore it down for a rewind. I do know that they have offered me that option for a 5F6A transformer.
     
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  3. rghill

    rghill Tele-Afflicted Silver Supporter

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  4. FenderLover

    FenderLover Friend of Leo's

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    That one is for a 6V6 amp, reflects 8K and is only rated for 20W. I'd go with post #3.
     
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  5. caspersvapors

    caspersvapors Tele-Meister

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    Thanks for the suggestions guys
     
  6. rogb

    rogb Tele-Afflicted

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    I think it was Triad?

    I changed my 5E3 to 6L6 and used Hammond Vibrolux 35w iron. Sounds great, plenty of headroom too!
    If I lived in the USA, I'd use Classictone, great transformers! Way more cost effective than MM.
     
  7. theprofessor

    theprofessor Friend of Leo's

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  8. caspersvapors

    caspersvapors Tele-Meister

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    interesting, Ill have to check out that thread. So you ended up going with the Bandmaster OT?

    So the 5d4 Wide Panel tweed super had an #1848 transformer (this is based on pictures I found on the internet) And Mercury has two different OTs listed as replacements for those.

    https://www.mercurymagnetics.com/?s=#1848&post_type=product

    I am thinking the FTWS-O should be the ticket? Its also noticeable smaller than the Bandmaster transformer. I am wondering if that #1848 stamp was used on different transformers?
     
  9. caspersvapors

    caspersvapors Tele-Meister

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  10. D'tar

    D'tar Friend of Leo's

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  11. theprofessor

    theprofessor Friend of Leo's

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    Yes, the 5f4 had a Triad 1848, as did the 5e7. The number listed on the 5f4 schematic is 45216. I spoke to Paul(? I think) at Mercury Magnetics, and the FTWBN-O was what he recommended. The Bandmaster is identical to the 5f4 in every way, except for one resistor and the number of speakers. So even though it's listed as a 5e7 Bandmaster output transformer, it's also a 5f4 Super transformer, and perhaps a 5d4 Super one, too.
     
  12. jsnwhite619

    jsnwhite619 Friend of Leo's

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    Just throwing this out there - please correct me if I'm wrong - but for a cathode biased 6L6 with 370v range B+, could a 6.6k Deluxe Reverb OT work? Unless you are wanting more headroom, but if you were, I assume you'd go with a 5f4.

    Sent from my XT1585 using Tapatalk
     
  13. zook

    zook Friend of Leo's

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    The Deluxe OT would work, it's a compromise rating, but it is too small for the job. A 40 Watt Vibrolux/ Pro OT is a better choice.
     
  14. jsnwhite619

    jsnwhite619 Friend of Leo's

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    What made me think of it is I recently replaced the filter caps on two old Silvertones - I had a thread about one, but they were nearly identical amps except 6v6 & 6L6. 1482 & 1483. The 1483 had the roughly the same cathode bias resistor as the 1482 & 5D4. Roughly the same B+ voltages, except getting there with a 5y3 vs 5u4g, so I assume the PT would have to be pretty low to be accurate. Anyway, I think a 5f4 used a 6k OT, and the 1483 used one roughly the size of a Deluxe Reverb OT. And even a 5f4 is only rated at 26 watts? At 420v+ and fixed bias?

    If it's built to the schematic voltages - 370v B+ and cathode biased - I can't imagine a 20 watt 6.6k Deluxe Reverb OT realistically being that much too small. Probably not the most clean headroom - although the 1483 Silvertone had plenty for an amp in that class - but there's probably better amps to build for that.
     
  15. cgharrison

    cgharrison TDPRI Member

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    I built a 5D4 using the 18088 from classictone, and all I can say is it sounds wonderful. Best amp I’ve ever built.
     
  16. zook

    zook Friend of Leo's

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    You're right there, and I once used a stock BF Deluxe reverb biased for 6L6s and it was fine although down a bit in wattage.
     
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