Just curious Transformer compatability question

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by jh45gun, Jan 14, 2008.

  1. jh45gun

    jh45gun Member

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    OK Just wondering what you guys think on this. Since I am making a amp out of a used chassis for a 5e3 clone the chassis had a 5y3 rectifer and two 6v6s in a push pull configuration Half the PI and half of a preamp stage was a 12ax7 and the VI was a octal tube 6J5. That socket is gone and I put in a 9 pin for a 12ay7 or 12ax7 depending on how each sounds. Anyway it is my contention since this chassis had most of the tubes needed for a 5e3 the transformers should work fine for my 5e3 project what do you guys think? The output tranny is rated at a 3.2 ohm load so 4 ohms and I plan to make a head and run a 2x12 cab at 4 ohms with it.
     
  2. Dave C

    Dave C Gold Supporting Member

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    While I'm not familiar with the specific iron you plan to use ....I do agree the tube compliments of both the original and 5E3 appear close enough that I'd give it a try .
     
  3. jh45gun

    jh45gun Member

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    Not sure if this will help or not the OT says 95-1489 and 343714 on it on the top of the frame. The PT says 95-1410 - 117 volts - 50 to 60 cycles and 138739 on it. I do not know if Zenith made their own transformers or used some one elses I do not know where to begin to look up for numbers either. Here is a pic of the trannys and the chassis before I painted the sides and started to do much work on it:

    [​IMG]
     
  4. teleamp

    teleamp Senior Member

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    Those tranformers should make a fine sounding 5E3. 3.2 ohms impedence corrects to 4 ohms, 4/1.25=3.2, 3.2X1.25=4.

    MikeY
     
  5. jh45gun

    jh45gun Member

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    Thanks Mike I did not know the math formula but I did know that that 3.2 equaled 4 as in the old days they used the 3.2 value a lot.
     
  6. Dave C

    Dave C Gold Supporting Member

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    Looks to me like a Zenith and a Stancor from probably '57...Zenith EIA source code is 343 and Stancor is 138 , the numbers following the source code are the date , first number "7" indicates the year(but not the decade)next 2 numbers indicate the week .(14 and 39). Hope this helps. Other numbers could be model ...or something else...
    http://www.triodeel.com/eiacode.htm
     
  7. jh45gun

    jh45gun Member

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    Cool thanks for the link and the info. So were those Stancor OT's used for any guitar amps at all or just radio and phono and audio stuff? Since Zenith just made audio stuff I would guess their transformers never seen any guitar amp use but still can be used OK
     

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