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  1. Replies
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    58

    You changed the jack as well as the plug? Was...

    You changed the jack as well as the plug? Was the original insulated or was it connected to chassis?
  2. Replies
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    99

    Looks to me like they use mineral spirits to...

    Looks to me like they use mineral spirits to dilute the 5% as opposed to the 100%.
    (aka naptha as Helmholtz mentioned)

    "Formulation: 5% DeoxIT® (active ingredient), 75% odorless mineral spirits...
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    70

    The drawing appears to be just wrong, as far as...

    The drawing appears to be just wrong, as far as the switching. I'd look for another in case there are other mistakes.
    How can they put that up on a page that's supposed to be dedicated to these...
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    328

    Yes, this is the case for both the Mesa and the...

    Yes, this is the case for both the Mesa and the Marshall, correct? My big problem is that Marshall, in their usual modern schematic 'brilliance' has decided to go against all schematic and even...
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    328

    The question reminds me of that EL34 100/100...

    The question reminds me of that EL34 100/100 Marshall power amp we were discussing the other day. I had the same 'chicken/egg conundrum' reaction. :D
    V2a grid gets signal only from OT secondary ...
  6. Thread: Ashdown ABM Evo II

    by g1
    Replies
    3
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    71

    If physical jarring has an effect on it, then it...

    If physical jarring has an effect on it, then it should be a connection issue. Bad solder, oxidized or loose connector, etc.
  7. Somebody gave me a can of this stuff, it's...

    Somebody gave me a can of this stuff, it's lanolin based and gets very viscous. Maybe similar to what is being described.
    https://www.fluid-film.com/
  8. I can't over-emphasize how good chocolate covered...

    I can't over-emphasize how good chocolate covered espresso beans are either (in case of emergency water outage).
    Be prepared!
  9. It's hard to chug hot coffee. :D Maybe that's...

    It's hard to chug hot coffee. :D Maybe that's why I drink so much, I don't mind it cold at all. Especially in the summer.
    First couple cups in the day have got to be hot though.
  10. Me too. I can fill my mega-mug 3 times from a 12...

    Me too. I can fill my mega-mug 3 times from a 12 cup pot. :)
  11. Replies
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    The '87 LE is not exactly the same as the HD. No...

    The '87 LE is not exactly the same as the HD. No exact schematic has been found as far as I know.
  12. No video but there is a pdf file about it here: ...

    No video but there is a pdf file about it here: https://music-electronics-forum.com/showthread.php?t=28549
  13. I've seen amps with tank mechanical feedback...

    I've seen amps with tank mechanical feedback where the last +/- half inch from the speaker is a deal breaker. And ones that couldn't be cured because someone had replaced the speaker with a much...
  14. I'm not sure what your arrangement is with the...

    I'm not sure what your arrangement is with the building owners, but if you are giving some kind of payment for the use of your space, then you need to be compensated for financial loss due to...
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    212

    I think you could tie the parallel cap (for C19)...

    I think you could tie the parallel cap (for C19) to the top of one of the plate resistors if you want to avoid flipping the board?
  16. Replies
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    371

    I don't think you are looking at the right...

    I don't think you are looking at the right resistors. Pg.2 of attached schematic has a layout with component locations.
  17. Replies
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    212

    I'm not convinced yet about the power supply. ...

    I'm not convinced yet about the power supply. You can get oscillation due to poor decoupling yet the supply rail looks fine. Tacking a known good cap across C19 is still worth a try.
  18. Replies
    17
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    278

    I don't think we are looking at the right...

    I don't think we are looking at the right schematic, so it's unclear when you call out component numbers.
    Your unit does not have FET outputs does it?
    Maybe the preamps are the same, but it needs...
  19. Replies
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    371

    Also, try measuring some of the other 100K plate...

    Also, try measuring some of the other 100K plate resistors, there should be several in that amp.
  20. Replies
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    278

    Are you still on the bulb? If so, recommend...

    Are you still on the bulb?
    If so, recommend you try connecting the load only while unit is turned on (when using bulb limiter). Power up without load, then connect load without turning unit off....
  21. Replies
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    1,398

    Can you post some pictures like Justin's above?

    Can you post some pictures like Justin's above?
  22. Replies
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    1,586

    I generally stick with standard values for...

    I generally stick with standard values for stocking, in this case that would be 270,330,390,470.
    I would try a couple of those, and if I felt I needed something in the middle, I would then order it...
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    1,398

    The cap values are different between the normal...

    The cap values are different between the normal and bass channel.
    It is easy to check what Pedro mentioned in post #22, swap the 2 caps that are different between channels.
    ...
  24. Replies
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    1,398

    How about on the bass pot, there is a 8.2K from...

    How about on the bass pot, there is a 8.2K from right (from front) lug to ground? The pot has good mechanical ground connection (not loose or corroded where meeting star washer/chassis) ?
    There is...
  25. Replies
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    Ok, in the picture, white is on 4ohm tap, blue on...

    Ok, in the picture, white is on 4ohm tap, blue on 8, yellow on 16.
    The white is the feedback wire and stays where it is.
    The yellow gets moved to be with the white.
    Re-label your rear panel so it...
  26. Replies
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    251

    On my stark 966 (hicock), the merit and life...

    On my stark 966 (hicock), the merit and life tests are 2 different things. You hold the merit down till the needle stabilizes like Justin mentioned. But there is also a 'life test' switch that you...
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    470 is always a good value to have on hand, used...

    470 is always a good value to have on hand, used in many applications. 330 also a standard value.
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    The top terminals are the secondary. One of them...

    The top terminals are the secondary. One of them is the 4 ohm tap and is going only to the feedback connections in the driver circuits.
    One of the others would need to be disconnected and added to...
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