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  1. "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...
  2. R 34 is 0.1 ohm/ 2 watt. 55221

    R 34 is 0.1 ohm/ 2 watt.
    55221
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    330

    Typically, Horn Sections are hard to get under...

    Typically, Horn Sections are hard to get under control.
  4. Replies
    7
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    130

    "Your schematics are incomplete, you are missing...

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

    Here is the HCA 2400, Pg 1 & 2:
    55184
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    18
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    373

    Tom. Happy to hear that you actually knew Bob...

    Tom.
    Happy to hear that you actually knew Bob Pease.
    I loved that shot of him ditching a computer off of the roof!
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    6
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    124

    16mV is fine for a dc offset

    16mV is fine for a dc offset
  8. Replies
    2
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    93

    HT 60 Schematic

    https://music-electronics-forum.com/attachment.php?attachmentid=47308&d=1519629152
  9. Replies
    8
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    207

    The Lion Tamer

    Has anyone any experience with this little widget?

    55163

    https://www.ebay.com/itm/Fender-Hot-Rod-Deluxe-Master-Volume-Module/183931703970?hash=item2ad32f12a2:g:dsMAAOSwJtdaN9mr

    It appears to...
  10. Replies
    26
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    330

    I was in a 'Vintage Rock/ Blues band for about 10...

    I was in a 'Vintage Rock/ Blues band for about 10 years.
    As a band we had total control of the band volume.
    Can you say "Dynamics".
    At the drop of the lead guitarists arm we could take the mix...
  11. Replies
    27
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    3,090

    It sounds like a faulty PCB.

    It sounds like a faulty PCB.
  12. Replies
    5
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    111

    Switch mode power supply and a Class D output...

    Switch mode power supply and a Class D output section.

    That is all the notes that I have on this new amplifier.
  13. Thread: Washrburn

    by Jazz P Bass
    Replies
    8
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    177

    Also, be aware that there where amps manufactured...

    Also, be aware that there where amps manufactured specifically for the Japanese market. (100 Volt AC line voltage)
    The label should show if that is the case.
    55109
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    381

    https://music-electronics-forum.com/attachment.php...

    https://music-electronics-forum.com/attachment.php?attachmentid=47308&d=1519629152
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    3
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    117

    That schematic labeling is drawn odd. The...

    That schematic labeling is drawn odd.
    The definition is lost in that scan.

    Follow the diodes.

    + is +

    - is -

    55095
  16. SPS1000 schematic: 55074

    SPS1000 schematic: 55074
  17. Replies
    25
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    339

    Check the Vac at the output tube grids (100Mv/ 1K...

    Check the Vac at the output tube grids (100Mv/ 1K input, all controls maxed)
    A 50 watt amp should be seeing about 50Vac at the grids. (double that for a 100W)

    If you have that, then the OT is...
  18. Replies
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    83

    55030

    55030
  19. PS schematic: 55028 Take note that the driver...

    PS schematic: 55028

    Take note that the driver IC (IXD404) is not available anymore.
    It can be replaced by the IXD604 though.
    55029
  20. Replies
    11
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    388

    Here are the specs: Continuous RMS power output...

    Here are the specs:
    Continuous RMS power output
    (6 ohms, 20 – 250 Hz)
    SA-WMSP85 100 W
    Reproduction frequency range
    28Hz – 200 Hz
    High frequency cut-off frequency
    150 Hz
    Here is the schematic:...
  21. "I added a small improvised PCB to act as a sort...

    "I added a small improvised PCB to act as a sort of terminal strip so wires to main PCB can´t tear transistor legs off if pulled."

    Sweet!
  22. Replies
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    165

    "Those seem to be empty......" Not too sure...

    "Those seem to be empty......"

    Not too sure what "Empty" means.

    Here is the unzipped file: 55002
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    165

    There are a number of "5150" Peavey amps. Here...

    There are a number of "5150" Peavey amps.
    Here is the combo & the head:
    54999
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    You have not indicated which wire is not...

    You have not indicated which wire is not connected.

    If it is the Black wire sticking up in the first pic, that is a ground wire.

    It appears to be the ground wire for the bridge.

    Black wires...
  25. The Service Manual can be found here:...

    The Service Manual can be found here: https://www.manualslib.com/manual/1204356/Yamaha-Stagepas-600i.html
  26. "If I wanted to be berated for not meeting...

    "If I wanted to be berated for not meeting someone's expectations, I'd call my father."

    Thanks for the coffee all over my keyboard.:)
  27. Replies
    3
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    141

    It's a good thing when you win one.

    It's a good thing when you win one.
  28. Replies
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    209

    "QSC is apparently using transistors for diodes...

    "QSC is apparently using transistors for diodes as the board components are 3 leg."

    The three leg configuration is common in a surface mount diode, although not the only package type.
    On a single...
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