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FDP Forum / Fender Amps: Vintage (before 1985) / Early Tolex Twin and Showman Output Transformers (before BF)



Sep 9th, 2019 11:55 AM   Edit   Profile  

Greetings vintage Fender aficionados. Looking to tap the brain trust here at FDP to help assemble accurate information regarding the part numbers Fender assigned to the output transformers used in these models, relative to the output impedance they offer. I have all the various part numbers used -- I just need to determine the output impedance they represent:

1. The Twin primarily used part number 45268. This was a rather large transformer that ultimately morphed into the somewhat smaller and long running 125A29A 4Ω transformer. But before the 45268 was put out to pasture, it likely acquired its own 125AxA part number, since that part numbering system came in well before the 125A29A came to be. Does anyone know what this part number is, or if it even existed?

2. The early Showman 5881/6L6GC based amps used no less than 4 different output transformers, of which 3 still need to be resolved/confirmed:

A. 45946 is reported to be a 16Ω transformer. I've seen this transformer installed, but have not been able to put any amps using this transformer together with the speaker cab the amp came with to positively verify this. Can anyone verify this?

B. 45945 is likely an 8Ω transformer, and like the 45946, large in size like the Twin transformer above -- but I have not been able to positively verify the impedance of this transformer, either. Can anyone verify my assumption?

C. 125A4A is also reported to be an 8Ω transformer. Physically large like the previous transformers mentioned, it -- if it is an 8Ω transformer -- is almost surely the new part number of the 45945 transformer -- assuming it is an 8Ω transformer as well. If this is true, then this transformer ultimately morphed into the somewhat smaller 125A30A used in BF Single Showman and Vibrosonic Reverb amps. Can anyone verify the impedance of this transformer?

Any credible information that can be provided would be greatly appreciated -- credible being either first hand knowledge, or well proven long established fact. What little information is available on the web is fraught with inaccuracies and ambiguities, or missing the needed information altogether -- which is why I'm seeking to assemble information of known accuracy. I've actually put about 95% of the puzzle together for both power and output transformers used throughout this period, but missing the information on these transformers.

Thanks in advance for any help you can provide!


FDP Forum / Fender Amps: Vintage (before 1985) / Early Tolex Twin and Showman Output Transformers (before BF)

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