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two el34s paired with a 100 Watt OT

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  • two el34s paired with a 100 Watt OT

    Apparently my Traynor has, from the factory, a HUGE 100 Watt output transformer. IIRC, to compensate I should half the speaker impedance. Stock, the impedance wire from the OT is an 8Ω. Thus I'm forced to use an 4Ω cab.

    If I'm aiming for a Marshall/Friedman FB resistor value of 27KΩ, might you have a recommendation for this FB resistor now?

  • #2
    You want to double the impedance to match the 2 power tubes, but you need to measure turn ratios anyway before making choices.

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    • #3
      Originally posted by Guitarist View Post
      Apparently my Traynor has, from the factory, a HUGE 100 Watt output transformer. IIRC, to compensate I should half the speaker impedance. Stock, the impedance wire from the OT is an 8Ω. Thus I'm forced to use an 4Ω cab.

      If I'm aiming for a Marshall/Friedman FB resistor value of 27KΩ, might you have a recommendation for this FB resistor now?
      Originally posted by alexradium View Post
      You want to double the impedance to match the 2 power tubes, but you need to measure turn ratios anyway before making choices.
      This^^^^^^^^^^^^^^^^^^^^^^^^^

      But I'm curious. Are you saying you believe Traynor (incorrectly or mistakenly) installed a 100W OT into an amp that is a two power tube model? And if so then you believe that the 8 ohm tap Traynor provided is incorrect?
      "Take two placebos, works twice as well." Enzo

      "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

      "Being born on third base and thinking that you must have hit a triple is pure delusion!" Steve A

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      • #4
        The wattage of the transformer has nothing to do with the impedance ratio.

        Do what Alexradium suggests and find out what the ratio is.
        The Ratio will dictate the tube setup.

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        • #5
          Originally posted by Chuck H View Post
          This^^^^^^^^^^^^^^^^^^^^^^^^^

          But I'm curious. Are you saying you believe Traynor (incorrectly or mistakenly) installed a 100W OT into an amp that is a two power tube model? And if so then you believe that the 8 ohm tap Traynor provided is incorrect?
          Just to chime in the hammand transformer on my 79 traynor is bigger than a similar fender 50 watt. Mine is a 50 watt.
          Nosaj

          You should cross reference the part number first.
          Binkie McFartnuggets‏:If we really wanted to know the meaning of life we would have fed Stephen Hawking shrooms a long time ago.

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          • #6
            If it is all stock, the labelling from the factory will be correct. I'm really not sure why you would be second guessing this. Traynor used large transformers in most of their vintage amps.
            "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

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            • #7
              The YBA-1A's prior to 1970 had huge output transformers. Normally they only used the 8 Ohm tap, if you take off the end bell, there is a 16 Ohm tap wire that is cut short.
              WARNING! Musical Instrument amplifiers contain lethal voltages and can retain them even when unplugged. Refer service to qualified personnel.
              REMEMBER: Everybody knows that smokin' ain't allowed in school !

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              • #8
                And the YBA-1A's, well the few i have seen, do not have the output impedance marked on the back of the amp.

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                • #9
                  Originally posted by loudthud View Post
                  The YBA-1A's prior to 1970 had huge output transformers. Normally they only used the 8 Ohm tap, if you take off the end bell, there is a 16 Ohm tap wire that is cut short.
                  Good to know
                  "Take two placebos, works twice as well." Enzo

                  "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

                  "Being born on third base and thinking that you must have hit a triple is pure delusion!" Steve A

                  Comment


                  • #10
                    It should also be mentioned, this is more of a 100W amp, and there are others that also get similar power from a pair of EL34.
                    The impedance of the OT has nothing to do with the power rating. So for this amp, the transformer is sized accordingly.

                    Thanks for the data Mozz. https://www.aguitarforum.com/threads/nutad.90883/
                    https://music-electronics-forum.com/...ad.php?t=42311
                    "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

                    Comment


                    • #11
                      Thank you so much for sharing your experience for which there is no substitute. I did look up previously the parts numbers via Hammond's site and it is listed as a special order (now) 100 Watt OT. Generally I run speaker cabs in parallel so if I approach a 4Ω or even 2Ω load, I trust that'll be fine.
                      I do also have a PPIVMV that I added

                      So this'll likely be my forever-amp from here on as it is so easy to work on and on and on...
                      I am starting to build an inductive-resistive load box for it from coils pulled from a Celestion crossover...if that works out then an effects loop would be moot. But it is tempting to add one, preferable parallel.
                      Attached Files

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                      • #12
                        Um... I think that's the power transformer.
                        "Take two placebos, works twice as well." Enzo

                        "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

                        "Being born on third base and thinking that you must have hit a triple is pure delusion!" Steve A

                        Comment


                        • #13
                          Ah ok, there were a few unlabeled pics from an email I sent them months back. Here's the OT then!
                          Attached Files

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