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What do you think about this PSU ?

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  • What do you think about this PSU ?

    With respect to the choke and the logistics of the power rail ? I ask because initially this was a el34 build that i changed to 6V with a trainwreck style 30w OT. But i left the 20H choke and the rest as it was. Does anything look like improvement is needed? I don't see 6V6 amps with chokes, at least none i looked at. Is it worth leaving there or might 6V6's be better off w/o a choke? What would you do with the power rail for the outputs. Would you configure it differently? Like i said it was initially a el34 amp and i don't think i changed anything when i went to 6V6 except of course the bias range and the OT.
    Attached Files
    Last edited by daz; 09-21-2022, 05:34 PM.

  • #2
    I've seen plenty of 6V6 amps with chokes - most commonly the Deluxe Reverb, but also with boutique amps - Victoria, Tone king and the like (mainly DR derived circuits, though). If it sounds OK, I'd leave it as it is. Otherwise you could A-B compare the sound of the choke with a fixed resistor - the choke has a subtly different dynamic compared to a resistor - especially at higher output levels.

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    • #3
      Originally posted by Mick Bailey View Post
      I've seen plenty of 6V6 amps with chokes - most commonly the Deluxe Reverb, but also with boutique amps - Victoria, Tone king and the like (mainly DR derived circuits, though). If it sounds OK, I'd leave it as it is. Otherwise you could A-B compare the sound of the choke with a fixed resistor - the choke has a subtly different dynamic compared to a resistor - especially at higher output levels.
      Din't realize deluxes have a choke. I looked but missed that. Anyways i'll leave it then. Just wanted to make sure theres nothing stupid there. Gonna recap the PSU so i figured if there was something i should change thats the time to do it. Thanks.

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      • #4
        Putting 6V6s in a 50W Marshall circuit promises short tube life, as most any tube limit (voltage, current, dissipation) will be exceeded.

        I hope you at least double load impedance.
        - Own Opinions Only -

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        • #5
          Originally posted by Helmholtz View Post
          Putting 6V6s in a 50W Marshall circuit promises short tube life, as most any tube limit (voltage, current, dissipation) will be exceeded.

          I hope you at least double load impedance.
          Why? Like i said the OT was replaced with a proper one and even the PT was. What else would be a problem? Plates are 390v and JJ 6v6 are supposed to easily handle way more then that. Unless i am missing something, which of course is always possible with me, it should be fine.

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          • #6
            Your schematic above shows 440V at the plates.

            What is OT primary impedance?
            Last edited by Helmholtz; 09-21-2022, 05:00 PM.
            - Own Opinions Only -

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            • #7
              The schematic is from when it was el34 and i changed it to reflect the new circuit but just didn't bother or missed changing that. It's 390v tho. But i have seen people say they run JJs higher than that.

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              • #8
                i edited it so it now shows proper voltage.

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                • #9
                  Not so much concerned with plate voltage as with plate and screen dissipation at medium output, where dissipation typically has a maximum.
                  But if your PT is smaller than the original giving some sag and OT primary impedance is around 6.6k, things should be ok.

                  Regarding the choke:
                  A choke typically gives better ripple suppression and drops less voltage than a resistor.
                  Last edited by Helmholtz; 09-21-2022, 06:01 PM.
                  - Own Opinions Only -

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                  • #10
                    Originally posted by Helmholtz View Post
                    OT primary impedance is around 6.6k, things should be ok
                    Yep, exactly... https://www.tubedepot.com/products/c...ormer-40-18064

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