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Does this power supply look okay?

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  • Does this power supply look okay?

    http://www.lynx.bc.ca/~jc/yvm-1.jpg

    I have a yvm-1 and it's layout doesn't exactly match this schmatic.
    I'm rewiring much of the amp, and I wondered if there's any advantage to doing it this way, specifically the first section of the power supply seems to have 2 40uf caps in parallel. This means that those 2 caps are effectively filtering as if being one 80uf cap, right?
    In my amp there was previously just one 40uf cap in that part.

    Is there any reason I shouldn't put the two 40uf caps in parallel?
    I know with tube rectification it would damage the rectification tube, but with diode rectification there's no problem with doing this right?
    I see it as an advantage, probably meaning less ripple in the b+.

  • #2
    Listen, very carefully. This guy is a master builder. If he has 2 40's for the power tubes, it means he's tuned the filter cap's in that part for those two power tubes. I would just stick with the print as drawn....


    -g
    ______________________________________
    Gary Moore
    Moore Amplifiication
    mooreamps@hotmail.com

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    • #3
      That is a very early schematic, there are no ECNs in the revision block. Many times Traynor amps don't match the schematic that you find inside the amp. A slightly different circuit was used when the choke was dropped that only had one "reservoir" cap. Does your amp have the choke?

      There were several years when just about every Traynor amp had two of those dual 40uF at 450V caps. Probably bought them in a huge quantity to get a price break.
      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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      • #4
        I didn't initially have a choke, but have bought one to use in the amp now. I've got extra 40uf 500v caps, so I think I will rewire things with the dual 40uf's at the start as long as there is no danger in doing so.

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        • #5
          No danger. Might not be much benefit, but it certainly wouldn't hurt.

          The difference between 40 and 80uF of filtering falls within the old parts substitution rule. Caps back in the day had tolerances like -20% +80% (or even wider) and it is a general rule that subbing a cap up to twice the original value is acceptable. Here, if there's a place for the cap and you've got it, sure.

          One place to not go up in value by much is the bias filter caps. I don't see a standby switch here, so you need the bias supply to charge up quickly.

          Now when you start coming up with ways to chain some of those input sections in series, that's when it gets interesting.
          My rants, products, services and incoherent babblings on my blog.

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          • #6
            actually ; I calculate anywhere between 40 to 60 uF for a plate filter for those pair of power tubes......

            -g
            ______________________________________
            Gary Moore
            Moore Amplifiication
            mooreamps@hotmail.com

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            • #7
              How are you calculating this?

              Originally posted by mooreamps View Post
              actually ; I calculate anywhere between 40 to 60 uF for a plate filter for those pair of power tubes......

              -g

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