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Silverface Fender Bassman 100 - Checking Voltage Question?

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  • #31
    Originally posted by BonesMachine View Post
    3 x 22uf 500v filter caps
    - 456 v
    - 438 v
    - 372 v
    2 x 100uf 350v filter caps
    - 216 v
    - 438 v​
    The voltage at the first 22µ shouldn't be higher than the voltage at the standby switch.

    Please post a schematic so we can identify parts.

    Shorted turns of an OT primary won't show in DC voltages, but will result in weak output.
    Did the OT pass the "neon test"?




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    • #32
      Here's a schematic. I also have some layout drawings if that would help let me know. I just ordered a NE-2 neon bulb so just waiting for that. hopefully these voltage readings don't show a problem that would cause damage to tubes or other parts of the amp etc. I would really love to play it for a bit to see how it sounds just kind of hesitant to do so...
      Attached Files

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      • #33
        Please make sure that voltage drops along points A, B, C, D.
        In post #31 you reported point B voltage being than at point A, which doesn't make sense.
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        • #34
          ok i uploaded a layout which shows a top view of the capacitor board at the bottom of the layout. i measured caps again here are the readings from left to right as far as the layout shows them:

          224v, 452v, 450v, 434v, 382v

          do these readings make sense? thanks
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          • #35
            I think your supply voltages are ok.
            Don't like to work with layouts. Should be much easier for you to see where the wires connect.
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            • #36
              What is your main concern? Fender amps have a shorting speaker jack to prevent OT damage in case you forget to connect the speaker.
              Does the amp seem to be working ok aside from having to replace a power tube?
              Originally posted by Enzo
              I have a sign in my shop that says, "Never think up reasons not to check something."


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