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    A 'bad' screen resistor, if open, would prevent...

    A 'bad' screen resistor, if open, would prevent the tube from conducting.

    Measure the grid (Pin 2) voltage levels of the EL84's.
    The output stage is Cathode biased so there is not a separate bias...
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    Read this thread:...

    Read this thread: https://music-electronics-forum.com/showthread.php?t=49707&p=538932&viewfull=1#post538932
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    Found the manual. Page 1 & 2 attached. 55489

    Found the manual.
    Page 1 & 2 attached.
    55489
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    Here is a 'snag' of the schematic: 55488

    Here is a 'snag' of the schematic: 55488
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    This may be the correct DSP schematic: 55487

    This may be the correct DSP schematic: 55487
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    Disconnect the OT.

    Disconnect the OT.
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    55482

    55482
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    It may be that the 'transistor' is a jfet.

    It may be that the 'transistor' is a jfet.
  9. "If not that, try sending a signal directly in to...

    "If not that, try sending a signal directly in to the Power Amp In jack.
    That will bypass the entire preamp.

    Alternatively, run the Pre Amp Out jack to another amp."

    You need to isolate the...
  10. I would buy the signal generator too: ...

    I would buy the signal generator too:
    https://www.ebay.co.uk/itm/Griffin-Signal-Generator-Amplifier/202792990155?hash=item2f376775cb:g:~mMAAOSwKhpdl5I5
  11. Have you tried running a signal level patch cord...

    Have you tried running a signal level patch cord from the Pre Amp Out jack to the Power Amp In jack?
    If that wakes it up then you have a dirty or bad Power Amp In jack.

    If not that, try sending a...
  12. You most assuredly need an O scope to see what is...

    You most assuredly need an O scope to see what is what.
  13. I purchased a grand total of $19.00 from Digikey...

    I purchased a grand total of $19.00 from Digikey & $9.00 from Mouser.
    I am not even going to submit.
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    I would address that question to the...

    I would address that question to the manufacturer:
    support (at) truetone.com
    Truetone Support Dept.
    4922 Port Royal Road, B-11
    Spring Hill, TN
    37174
  15. "until today, when the INPUT on the PA system was...

    "until today, when the INPUT on the PA system was putting OUT 14vdc,"
    Hah!
    Had a guy blow up 2 separate looper pedals that way.
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    "First I measured the output of the iPod and...

    "First I measured the output of the iPod and tried to set it to 500mA" (mv?)

    That is a pretty 'hot' signal level.
    I would go with 100mv.
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    55378 Is the enclosure itself attached to...

    55378

    Is the enclosure itself attached to circuit ground?
    It should be.
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    Those heated up solder suckers are a joke! Clean...

    Those heated up solder suckers are a joke!
    Clean the tip, unclog the barrel, clean the filter, wait for it to get to temperature.

    I have used this handy device for years.
    55373...
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    What is the chance that one of the four speakers...

    What is the chance that one of the four speakers no longer works?

    That would be a game changer.
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    Yamaha had more G100 models than Campbell's has...

    Yamaha had more G100 models than Campbell's has soup.

    Here are all of the G100 versions that I have: 55349
  21. https://www.manualslib.com/manual/225279/Crown-Mac...

    https://www.manualslib.com/manual/225279/Crown-Macro-Tech-Ma-1200.html
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    " complaint is static out of one channel". So...

    " complaint is static out of one channel".
    So the amp arrived with Bridge mode switch engaged.
    How can "one channel" be staticky when the two amplifiers are bridged?

    I would verify with the...
  23. Wow! It took a real dweeb to ship that...

    Wow!
    It took a real dweeb to ship that transformer that way.
    And then they will blame the carrier.:(

    On a side note: I talked to a UPS rep one day and he said that UPS does not have a 'fragile'...
  24. "What voltages am I interested in taking here?" ...

    "What voltages am I interested in taking here?"

    Follow the schematic:
    V + & V- (about 35Vdc)
    +15 & =15 preamp supplies

    The schematic does not have any pin designators on the TDA2050.
    Here is...
  25. R 34 is 0.1 ohm/ 2 watt. 55221

    R 34 is 0.1 ohm/ 2 watt.
    55221
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    Typically, Horn Sections are hard to get under...

    Typically, Horn Sections are hard to get under control.
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    "Your schematics are incomplete, you are missing...

    "Your schematics are incomplete, you are missing the AC board."
    Here it is: 55191
  28. Here is the HCA 2400, Pg 1 & 2: 55184

    Here is the HCA 2400, Pg 1 & 2:
    55184
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