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  1. Links to Acoustic (ACC) schematics

    https://music-electronics-forum.com/showthread.php?t=40939
  2. Replies
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    With wire short circuit TP5 and chassis (Tremolo...

    With wire short circuit TP5 and chassis (Tremolo off). If there is still a "pulsation" check C22; C23 (10uF / 400V)
    Check on PCB that is no uncertain or cold solder defect in P4 (Intensity) circuit.
  3. Replies
    3
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    133

    What is the best glue for bakelite?

    A moment of inattention and I broke nose on bias test octal adapter.
    Does anyone know what the best glue for bakelite?

    55222
  4. Replies
    25
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    479

    When checking old and new capacitors, an ESR...

    When checking old and new capacitors, an ESR meter may be the right solution, as it indicates, among other things, the state of dryness.

    Personally, before any capacitor testing, I use an old good...
  5. Replies
    25
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    479

    When recapping oldtimers (vintage) amplifiers,...

    When recapping oldtimers (vintage) amplifiers, original capacitors of appropriate values cannot always be found. It is therefore necessary to adopt the first approximate value that is produced.
    The...
  6. Replies
    2
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    97

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

    https://music-electronics-forum.com/showthread.php?t=38048 Jazz P Bass)
  7. Replies
    141
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    1,887

    This is not fast moving game chess game, so...

    This is not fast moving game chess game, so conclude within 10 minutes.

    I hold that I am qualified enough (telecommunications engineer for 40 working life) to follow this thread, so for the pure...
  8. Replies
    141
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    1,887

    Tip ...

    Tip

    https://music-electronics-forum.com/showthread.php?t=41113

    https://robrobinette.com/Tube_Guitar_Amp_Overdrive.htm

    https://www.effectrode.com/knowledge-base/guitar-preamp-tone-explained/...
  9. Replies
    141
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    1,887

    Perfect signal symmetry at the power tube grids,...

    Perfect signal symmetry at the power tube grids, implies matched power tubes.

    We have relatively not paired power tubes.
    For the same idle current, bias voltage of one power tube is for example...
  10. Good old days 55142

    Good old days
    55142
  11. Replies
    141
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    1,887

    Schematic is good while new and matched tubes in...

    Schematic is good while new and matched tubes in the amplifier.
    Matched tubes is a relative term, with limits of +/- 5%, beyond those limits tubes is unmatched.
    Let's not forget that power from...
  12. Replies
    5
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    113

    https://www.ssguitar.com/index.php?topic=3361.0...

    https://www.ssguitar.com/index.php?topic=3361.0
    Hartke B300 output schematic

    https://music-electronics-forum.com/showthread.php?t=34066
    Hartke B-60
  13. Replies
    141
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    1,887

    I see a lot of pictures from the oscilloscope,...

    I see a lot of pictures from the oscilloscope, various numeric values from the screen, who it mean nothing.
    We just don't know what we want with a bunch of data.
    I am afraid that we will stray...
  14. Replies
    141
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    1,887

    Why did you put in an independent bias. Even the...

    Why did you put in an independent bias. Even the slightest imbalance of the bias manifests itself as a hum.

    Tip.
    In order to do custom any amplifier, you must first bring in 100% mint condition.
  15. Replies
    141
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    1,887

    Ripple has nothing to do with the (para) phase...

    Ripple has nothing to do with the (para) phase inverter.
    Ripple is about 100 mV / 50Hz, and the amplifier is without any signal from the generator.
    Don't you think about ground loop?

    EDIT 190909...
  16. Replies
    141
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    1,887

    Again stupid question. Is there a ripple when...

    Again stupid question.
    Is there a ripple when the amplifier is off?
    If a ripple exists when the amplifier is off, this indicates a (general) problem of grounding.

    Second question is whether what...
  17. Replies
    141
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    1,887

    A seemingly stupid question. Is there ripple...

    A seemingly stupid question.
    Is there ripple when all tubes from the amplifier are removed and the amplifier is on?
  18. Replies
    141
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    1,887

    Since you are expecting a hi-fi amplifier...

    Since you are expecting a hi-fi amplifier performance from a guitar amplifier, I'm afraid you will have to do a lot of work on grounding and shielding and revision the parts, as oldtimer built-in...
  19. Replies
    8
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    149

    For rewinding technicians charge 25 to 40% of the...

    For rewinding technicians charge 25 to 40% of the cost a new transformer.
    The advantage of rewinding is that the original core with the original windings.
    Simply Eden E300T is in good condition,...
  20. Replies
    141
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    1,887

    The real question. And how ripple manifests in...

    The real question.
    And how ripple manifests in speaker to sound.

    To such demanding "musicians" I have a habit of telling them ... bring the same model of amplifier that sounds different from...
  21. Replies
    8
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    149

    For the output transformer, it is not so...

    For the output transformer, it is not so important the plate voltage data, how important is the data for how much power is provided, how much is the allowed primary current and how much is the...
  22. The power of the dummy load resistor depends on...

    The power of the dummy load resistor depends on the power of the amplifier being tested.
    For a guitar amplifier 100W the optimum power of the dummy load is of the order of 150W (dummy load has air...
  23. Replies
    13
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    55080

    55080
  24. About burnt output tubes

    55077 55078 55079
  25. https://music-electronics-forum.com/showthread.php...

    https://music-electronics-forum.com/showthread.php?t=41558
    Bose L1, PS1 help needed have official Bose Repair Manual

    https://www.scribd.com/document/81452344/Bose-PS1
    Bose_PS1
    look at the...
  26. Yamaha G100 schematics

    Accurately
    The Yamaha G100 amplifiers are manufactured in three versions.

    G100 version I (transistor preamp; two channel)...
  27. https://elektrotanya.com/bose_l1_ii_system.pdf/dow...

    https://elektrotanya.com/bose_l1_ii_system.pdf/download.html

    https://en.audiofanzine.com/powered-pa-speaker-cabinet/bose/l1-model-ii/medias/other/
    ...
  28. http://music-electronics-forum.com/attachments/347...

    http://music-electronics-forum.com/attachments/34723d1436203248-behringer-pmp1280s_5000-mixer-sch.zip

    or

    https://music-electronics-forum.com/showthread.php?t=41121
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