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  1. Replies
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    Thanks for the clarification.

    Thanks for the clarification.
  2. Replies
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    114

    What is that, a double toroidal transformer?...

    What is that, a double toroidal transformer?
    58669
  3. Replies
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    669

    My guess is it's too new of an amp to be...

    My guess is it's too new of an amp to be 'released' yet.
  4. Replies
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    386

    I have already gotten amps in where the rectifier...

    I have already gotten amps in where the rectifier tube was inserted in the output tube socket and the output tube in the rectifier socket.

    "Can't understand why it's blowing fuses."
  5. Replies
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    288

    https://www.ebay.com/itm/Power-transformer-for-dyn...

    https://www.ebay.com/itm/Power-transformer-for-dynaco-ST70-El34-tube-amplifier-WE-300B-Healthkit-W5M-KT66/183776346164?hash=item2ac9ec8034:g:sY0AAOSw-0xYlP2L
  6. Replies
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    87

    I have not had a chance to work on a B200R. From...

    I have not had a chance to work on a B200R.
    From what I can gather, the Chinese ones have an issue with the jack board.
    https://valvetubeguitaramps.com/ampeg-b200r/
    And there are issues with a...
  7. Here is the SM. 58651 The actual cabinet...

    Here is the SM.
    58651
    The actual cabinet dimensions are on the last page.
  8. The 'Mute' circuit is the same as the main output...

    The 'Mute' circuit is the same as the main output mute.
    To unmute the TDA2052, Pin #3 must be +2.7 V above -V rail for the IC.
    That + voltage appears to come from an opamp before the header (preamp...
  9. Replies
    47
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    928

    "I guess you mean IC rather than F&T ?" Yup....

    "I guess you mean IC rather than F&T ?"
    Yup.
    Thanks for the correction.
  10. Replies
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    928

    "Plate resistors & solder joints are the Achilles...

    "Plate resistors & solder joints are the Achilles heel of the Hot Rod series."
    Amen to that!
    And then there are the F&T capacitors......
  11. "If i go up to like 210 ohms for the bias...

    "If i go up to like 210 ohms for the bias resistor, will that kill the plate voltages?"

    Plate voltages will go lower.
    Not sure what you mean by 'kill'.
  12. Replies
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    As far as I know, BK Butler always used J112's...

    As far as I know, BK Butler always used J112's for switching.
    Your matrix appears backwards.
    The J112 is an n channel jfet, meaning it is 'Normally On' until a Negative voltage is applied to the...
  13. Replies
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    https://ampeg.com/support/files/Schematics/P%20Ser...

    https://ampeg.com/support/files/Schematics/P%20Series/PB800/
  14. That is a good, readable version....

    That is a good, readable version.
    https://music-electronics-forum.com/attachment.php?attachmentid=23216&d=1367758163
    Thanks.
    The one that I had on file was smudgy.
  15. Replies
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    Wow! Nice. Must have taken some effort.

    Wow!
    Nice.
    Must have taken some effort.
  16. Replies
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    199

    http://www.exicon.info/cross-ref.php

    http://www.exicon.info/cross-ref.php
  17. Replies
    45
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    1,393

    F1: 2A FB: High voltage supply. F2 & F3: 1A SB:...

    F1: 2A FB: High voltage supply.
    F2 & F3: 1A SB: Dc heater supply.
    F4; 10A FB: main AC heater supply.
    All values seem reasonable.

    Bugera was pulling your chain.
  18. Replies
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    1,393

    Here is a crop of the 333XL power supply. F4 is...

    Here is a crop of the 333XL power supply.
    F4 is stated as 10A Fast Blo.
    58398
  19. Replies
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    205

    There were some issues with the Sonzero 20 with...

    There were some issues with the Sonzero 20 with the FX loop causing hiss.
    Not sure if that is what you are describing....
  20. Here is a repost of the schematic: 58357

    Here is a repost of the schematic: 58357
  21. Agree. The heat will soften up the loctite. (it...

    Agree.
    The heat will soften up the loctite. (it will bubble)
    Plus the difference in thermal expansion of the PEM & the screw should give you a chance to remove the broken piece.
  22. The attachment icon is the 3rd from the right....

    The attachment icon is the 3rd from the right. (Insert Image)

    58321
  23. Replies
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    594

    Schematic link is dead. Here: 58313

    Schematic link is dead.
    Here: 58313
  24. Replies
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    689

    This guy drilled the case & inserted pins....

    This guy drilled the case & inserted pins.
    http://mrmodemhead.com/blog/fluke-170-series-kickstand-repair/
    It does look like a cheesy design.
  25. Replies
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    "The problem is that I'm only getting 130V at the...

    "The problem is that I'm only getting 130V at the output pin of the EZ81.'

    It seems to me that 1/2 of the rectifier is not working.
    Replace the tube.
  26. Replies
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    From post #8: "No , especially Q1 seems to be not...

    From post #8: "No , especially Q1 seems to be not conducting. Base-emitter voltages need to be between 0.5V and 0.7V for conduction."

    Have you replaced Q1?
  27. Replies
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    58261 58262

    58261

    58262
  28. Thread: Ampeg

    by Jazz P Bass
    Replies
    13
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    598

    Here is a zipped copy: 58197

    Here is a zipped copy: 58197
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