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    If you can hear hiss (amp noise), it's likely...

    If you can hear hiss (amp noise), it's likely working. My bet is that your source just doesn't contain much HF information. The cap could be going bad and it's crossing over higher than it should be....
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    55695 Edit: Looks like dmeek beat me!

    55695

    Edit: Looks like dmeek beat me!
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    1) Would I just clip the scope leads over each...

    1) Would I just clip the scope leads over each individual filter cap to test? Yes, that will work.
    2) Would I need to input a signal? Nope.
    3) The scope would need to be rated better than the...
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    The 51kHz could be the hiss or harmonic/byproduct...

    The 51kHz could be the hiss or harmonic/byproduct of the hiss, which is not what is being chased. You'd need to turn the timebase down on the scope to see 60-120Hz.
  5. All of the test points and expected voltages are...

    All of the test points and expected voltages are labeled on the schematic.
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    With volume at 10, you are going to get some...

    With volume at 10, you are going to get some hiss. I can't say if you have more hiss than normal, but some gain noise is to be expected.
  7. I was talking about between the transducer coil...

    I was talking about between the transducer coil and core. I've drawn an arrow on this picture for clarity. Often times, it's really loose and will vibrate causing oscillation. I think you did...
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    First, make sure your scope is rated above B+...

    First, make sure your scope is rated above B+ DCV. Use a X10 probe. There will be some ripple, but it will be a very small percentage in relation to the DCV. It could be a flaky joint or a bad...
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    That is symptomatic of a failing filter cap much...

    That is symptomatic of a failing filter cap much of the time. If you have a scope, look for ripple on supply lines. If not, measure AC with your DVM. You could also tack a known good cap with proper...
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    Looks like Leo gets the gold star. ;)

    Looks like Leo gets the gold star. ;)
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    I'm not sure why your tester isn't showing a...

    I'm not sure why your tester isn't showing a short, but I'm still betting there is one. Check tube pins with a DVM. Is something shorted to the filament. If the filament doesn't glow, it's a good bet...
  12. Does touching the transducers in the tank stop...

    Does touching the transducers in the tank stop the oscillation? I've had to insert a little rubber cement in the middle of transducers to stop oscillation. If loose they will vibrate.
  13. I agree with Chuck's "hinky" and g1's "strange"....

    I agree with Chuck's "hinky" and g1's "strange". There are definitely some things not making sense here.
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    You might contact Torres Engineering and see if...

    You might contact Torres Engineering and see if they still have them. They used to. It doesn't spec taper in the link, but they use them for guitar, so my bet is that it's audio taper. It might be...
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    Have you tried cleaning it?

    Have you tried cleaning it?
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    Just wanted to make sure. The adjustment screw on...

    Just wanted to make sure. The adjustment screw on the meter should work in that case. If it were simply a zeroing issue, messing with the adjustment would likely have screwed up the calibration...
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    If you insert a test tone and run it up to 0dB,...

    If you insert a test tone and run it up to 0dB, does it match the other meters? In other words, is it a calibration issue or a zeroing issue?
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    If two power tubes have filament voltage and the...

    If two power tubes have filament voltage and the other two and no preamp tubes light, I suspect a connection issue. Probably another burnt or open trace. Follow the traces that carry filament voltage...
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    This won't always work. Sometimes the rollers are...

    This won't always work. Sometimes the rollers are just passed it and nothing but replacement will work. That said, I've used a fine emery cloth in the past. Apply slight pressure to the roller as it...
  20. Good point! Bias should be set without the...

    Good point! Bias should be set without the limiter at full/normal line voltage.
  21. I'm not sure the Mrs. would appreciate that...

    I'm not sure the Mrs. would appreciate that statement. ;)
  22. The treble control may not have much effect on a...

    The treble control may not have much effect on a 1K test signal. Try a higher frequency. Yes, you could indeed have a problem there, but your test isn't proof of that.
  23. If you bias hotter, you are going to draw more...

    If you bias hotter, you are going to draw more mains current. The additional current comes from somewhere.

    Edit: Enzo beat me!
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    Making wire manufacturers rich.

    Making wire manufacturers rich.
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    It's a cathode biased amp and likely just the...

    It's a cathode biased amp and likely just the power tubes you selected. A different set of tubes would likely yield a different voltage. It's nothing to worry about. If you want to bias hotter or...
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    Tweaked slightly. 55504

    Tweaked slightly.
    55504
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    I still have one of those!

    I still have one of those!
  28. Yes. I'm aware of that. All JBL D series were...

    Yes. I'm aware of that. All JBL D series were opposite phase, unless they were reconed with an aftermarket kit. What's in question is how Fender wired them.
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