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  1. Replies
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    Read my answer in context. OP is NOT asking...

    Read my answer in context.


    OP is NOT asking me whatīs the amplifier power output, what is the overload point, NONE of that.

    Heīs worried about damaging his scope, which is reasonable because...
  2. Replies
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    Well, yes. From your description you have no...

    Well, yes.
    From your description you have no problem at low levels, only when played loud, so youīll need to reach exact same volume/level, whatever it is, or you are not reatually testing your...
  3. IF you were in USA you might have a Plan B...

    IF you were in USA you might have a Plan B available: FM212 is on Fenderīs infamous Do Not Repair list, so they send a new one and tell Authirized Tech to trash it.

    Mmmaaaayyyybbbeeee some such...
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    No shields on Speaker wires buy yes, if you use a...

    No shields on Speaker wires buy yes, if you use a metallic 1/4" plug , touching its cover/body means touching a HOT speaker signal.

    In principle you should NOT plug/unplug speaker cables while amp...
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    Agree and add: please post the FULL Punch 10...

    Agree and add: please post the FULL Punch 10 schematic, may help reasonably estimate current/power consumption demands.

    Yes, the supply is simple, but we know nothing about its load .

    Thanks.
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    And in any case, speaker out jack "ground" is not...

    And in any case, speaker out jack "ground" is not ground at all but *hot 2", just out of phase with "hot 1" and just as dangerous or unadvisable to touch, like on any amp.

    I touch the Hot line...
  7. The main problem is all markets are compromised....

    The main problem is all markets are compromised.

    20 former famous brands closed/disappeared/ere absorbed and are currently made and sold by a single monster entity, rinse and repeat.

    So 60/100...
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    Save a lot of time and SCOPE IT.

    Save a lot of time and SCOPE IT.
  9. Stinking to high Heaven. Absolute best case:...

    Stinking to high Heaven.
    Absolute best case: dollars to lawyers, cents to you.

    A similar case:
  10. Replies
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    Just curious, what would the "Repairman in...

    Just curious, what would the "Repairman in Florida" name be?
  11. Thread: GK BP250

    by J M Fahey
    Replies
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    130

    If none appears, please post a gut picture. I...

    If none appears, please post a gut picture.

    I *suspect* it canīt be too different from the earlier "200" series, just slightly upgraded from 100 to 125W and sporting a btoroidal transformer...
  12. Just checked the schematic. :) Sadly,in this...

    Just checked the schematic. :)

    Sadly,in this quite simplified amplifier, switching is not electronic (Fets or transistors) but the simplest mechanical, a plain push switch, thatīs why this amp...
  13. If somebody posts the schematic I might find a...

    If somebody posts the schematic I might find a way to add some extra muting to dirty channel when "Off".
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    Positive voltage can actually reach a few +...

    Positive voltage can actually reach a few + Volts, only problem is that grid will start passing current, but if source can supply it, so be it.
    No damage usually because source driving it in general...
  15. Welcome and please start a new thread telling...

    Welcome and please start a new thread telling YOUR own problem.
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    Ok, now we only have Plan B left. Go to reverb...

    Ok, now we only have Plan B left.

    Go to reverb return jack (is it connected through RCA jacks or straight plugged into PCB?) and follow the track leaving it, it should lead you to a coupling...
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    I was half expecting this answer, always...

    I was half expecting this answer, always nitpicking on numbers but missing the main idea.

    Which is: the Mods are useless, best case doing nothing, worst case damaging a classic design tested and...
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    Please post the original schematic or we donīt...

    Please post the original schematic or we donīt know what C** , R** ,etc. mean.

    That said, read this thread:
    https://music-electronics-forum.com/showthread.php?t=40026
    which tells you more than...
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    ???? ... the Bass cap is C2 . But this is not...

    ???? ... the Bass cap is C2 .

    But this is not a BF tone stack !!!!!!!
    Itīs a VOX/Gibson GA70/Fender Pro 6G5-6G7 one !!!!

    I suggest you do and check the VOX tone stack there compared to the...
  20. Probably Homeland Insecurity was hoping to find...

    Probably Homeland Insecurity was hoping to find little bags of whitish powder between face to face tied speakers.

    They werenīt sure about what X Ray screens showed because they could not focus...
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    Please open a new thread for your problem....

    Please open a new thread for your problem.
    Nobody reads 12 year old posts.
    Besides, your problem is a different one :)
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    Well, you may find minor differences, but main...

    Well, you may find minor differences, but main ones are visual ones (Tolex, grill cloth, etc.) and of course the silkscreened label.
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    Buy two chickens and sharpen a dagger, sacrifice...

    Buy two chickens and sharpen a dagger, sacrifice them and then, either make a ton of Italian sauce chicken stew to accompany your pasta or broil them after being covered with butter, smoked paprika,...
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    You already have an audio probe :surprised: :...

    You already have an audio probe :surprised: : simply select the distortion and its output is connected to a clean power amp and speaker.
    Which works fine because the clean channel sounds fine trough...
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    Ok, then I have to give you *terrible* news...

    Ok, then I have to give you *terrible* news :surprised:

    Everything checks normal, so your distortion stage, Q5, is not *broken* , but works as expected.

    That it puts out sh*t by the bucketful...
  26. That one is labelled Dagnall so itīs presumably...

    That one is labelled Dagnall so itīs presumably British made.
  27. Yes, thatīs the way to do it. I am amazed at...

    Yes, thatīs the way to do it.

    I am amazed at this one though.
  28. Ouch!!! Post/Mail/Freight/Courier/whatever are...

    Ouch!!!
    Post/Mail/Freight/Courier/whatever are *animals* ; no doubt about that, but it does not excuse Marshall, who should know about it (and which obviously does, given the zillion shippings they...
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