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  • #1

    Bassman reissue problem

    I'm working on a Bassman reissue(not the LTD) that has a fixed bias. Had a bad power tube and replaced the pair. Checking the bias and it's down in the 28-29mv range. Checking further, I have -55 at C- and 485 at B+ (good as per the schematic I have) but the voltage at TP7 should be 257 and I have the same voltage as at B+(485). Is this a problem with the output tranny? I don't see anything else in that circuit that would affect that.
    Thanks!
    Tags: None
  • #2
    Fender Bassman Reissue

    Can you please supply a model number?
    Post the schematic if you have it.
    I do not know what Test Point 7 is.

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    • #3
      The Model is: 59 Bassman. Link to the schematic is http://www.fender.com/support/amp_sc..._Schematic.pdf

      Thanks!

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      • #4
        You're mixing the DC and AC. Anything in an oval is the AC level measured with the stated input signal. The voltages shown in rectangles or squares is DC.
        Last edited by JoeM; 02-03-2010, 06:10 PM.
        "In theory, there is no difference between theory and practice. In practice there is."
        - Yogi Berra

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        • #5
          Just label me "D" for dumb. Thanks

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