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PT values for 5E3, 5E9A and 5F11

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  • PT values for 5E3, 5E9A and 5F11

    Hi there

    I am mulling over which one to build next.

    Since I am in the amp modding backwater of the planet I have to get the PTs and OTs made up especially.

    I was wondering if there was much difference in the PT volts/amps values for the above

    My guess is that the 5E3 is something like:
    320-0-320 1A (With a 5Y3GT, or is that too high?)
    5 - 5 2A
    6.3-0-6.3 3A

    (Hope I've got enough buffer in those current values)

    I can't see there would be any difference for the 5F11 (same number and type of valves)

    But does this change much if you go to a 5U4GA and add a 12AX7 (for 5E9A)?

    Cheers
    Last edited by tubeswell; 03-12-2008, 09:53 PM.
    Building a better world (one tube amp at a time)

    "I have never had to invoke a formula to fight oscillation in a guitar amp."- Enzo

  • #2
    A 5u4 draws 3 amps from the 5volt winding, so a higher capacity transformer would be needed, to use that rectifier. 1000ma of B+ .... was that a typo?
    320-0-320 is fine. If you have the room on your chassis, the Vibrolux tranny is the ticket.

    TRANSFORMER, POWER, FENDER REPLACEMENT, 325-0-325 V, 180 mA

    P-TF22723

    Replacement for Fender Vibrolux. Equivalent to #125P26A & # 036483. 35 Watts.

    Primary: 117 volt, 60 Hz
    Secondary: 325-0-325 V, 365VDC@180 mA(DC) with 50 V bias tap
    Filament winding 1: 6.3 V, 4 A
    Rectifier Filament: 5 V, 3 A
    Mounting centers: 2.5" x 3.125"
    Weight: 6.5 lbs.
    Sometimes I'm good, then I'm bad..
    http://www.evacuatedelectronics.com

    Comment


    • #3
      Ooops,, didn't see the part about where you're from.. Sorry.. Anyway those specs I posted are good for the circuits you mentioned.
      Sometimes I'm good, then I'm bad..
      http://www.evacuatedelectronics.com

      Comment


      • #4
        Originally posted by sportster4eva View Post
        A 5u4 draws 3 amps from the 5volt winding, so a higher capacity transformer would be needed, to use that rectifier. 1000ma of B+ .... was that a typo?
        320-0-320 is fine. If you have the room on your chassis, the Vibrolux tranny is the ticket.

        TRANSFORMER, POWER, FENDER REPLACEMENT, 325-0-325 V, 180 mA

        P-TF22723

        Replacement for Fender Vibrolux. Equivalent to #125P26A & # 036483. 35 Watts.

        Primary: 117 volt, 60 Hz
        Secondary: 325-0-325 V, 365VDC@180 mA(DC) with 50 V bias tap
        Filament winding 1: 6.3 V, 4 A
        Rectifier Filament: 5 V, 3 A
        Mounting centers: 2.5" x 3.125"
        Weight: 6.5 lbs.
        The amp he is talking about is a little thing making less then 10-12 watts.
        You are thinking brown or black face amps. Totally wrong transformer for his projects.
        Bruce

        Mission Amps
        Denver, CO. 80022
        www.missionamps.com
        303-955-2412

        Comment


        • #5
          True, it would be overkill for sure, but a 5u4 rectifier was mentioned. If that weren't the case then something like a deluxe trans. would do it.
          Sometimes I'm good, then I'm bad..
          http://www.evacuatedelectronics.com

          Comment

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