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  1. Replies
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    I guess "not using a Variac" does not imply...

    I guess "not using a Variac" does not imply "using a lightbulb limiter instead"
    Just checking.
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    Please be careful 5V rectifier windings are not...

    Please be careful
    5V rectifier windings are not same as "a standard 6V filament winding, just putting out 5V" by any means.
    Filament windings expect to live grounded or worst case elevated a few...
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    Thanks. Luckily it lasted only 4 hours and...

    Thanks.
    Luckily it lasted only 4 hours and apparently followed the exact same path as the US one: branches trying to cover for main line sections and dropping themselves.
  4. Irt definitely might, so itīs worth checking. ...

    Irt definitely might, so itīs worth checking.

    That said, I guess today_not_so_popular 16 ohm choice by Marshall (an d some Laney and Vox amps, all "British" *may* be to push users to get some 16...
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    GW is a confirmed trick man, just like that. Or...

    GW is a confirmed trick man, just like that.
    Or uses typical Politician tricks to catch audience... same thing.

    His video is crap useless, all it tells you is that amp is "workung" ... which you...
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    Above ideas are excelent but the easiest to...

    Above ideas are excelent but the easiest to UN-mod back to normal (do you think he wonīt change his mind at random?) and to boot *effective* , you get as many dB down as you wish, no 3 or 6 dB by...
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    Yes, search how Hi Fi amplifier "balance control"...

    Yes, search how Hi Fi amplifier "balance control" is made, or active bass pickup blending.

    Basically:
    1) you join grids
    2) plates are separate, each one goes to its own output volume control....
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    Agree and add: maybe you can get a "normal" pot...

    Agree and add: maybe you can get a "normal" pot with proper size and shaft, and instead of plain wires, you use brass wire to replace the long legs, so replacement keeps reasonably holding the PCB....
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    Vox really LOVED inverting input Op Amps, itīs...

    Vox really LOVED inverting input Op Amps, itīs all the SuprTwin uses: input preamp - reverb drive - reverb recovery - Baxandall tone control
    ...
  10. What current does your pedal need? Absolute...

    What current does your pedal need?
    Absolute worst case, measure when you get it, being analog power consumption "should" be reasonable .
    Battery indicators use power for themselves, so one old Boss...
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    In any case, 14mV offset is not enough to trigger...

    In any case, 14mV offset is not enough to trigger any speaker protection.
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    Sorry MrC but I asked you to make all corrections...

    Sorry MrC but I asked you to make all corrections RED for a reason. :)

    I am jumping back and forth comparing values and half the time I lose track (since we OCD people focus on *one* issue at a...
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    Cool. So you were straight missing your first...

    Cool.
    So you were straight missing your first power filter.
    That explains both the massive (unfiltered) hum and the 30% lower "DC Voltage" ... although it was not real DC but unfiltered full wave...
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    Simplest "practical" charger is a power supply...

    Simplest "practical" charger is a power supply with maximum desired voltage , say 16V which is 100% charge, and with a limiting resistor so when charging a real flat battery (11V or so) current is...
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    https://www.youtube.com/watch?v=uzb6zDFg3WQ

    https://www.youtube.com/watch?v=uzb6zDFg3WQ
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    Sorry but not compatible. This is the 8100 head,...

    Sorry but not compatible.
    This is the 8100 head, single 100W RMS into 4 ohm, rails about +/- 40V
    Besides, it does not have a high voltage winding, it uses a separate sutotranformer .

    }VS 8240...
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    1) get two new batteries 2) Sealed Lead Acid...

    1) get two new batteries

    2) Sealed Lead Acid batteries need an SLA charger,period.
    They are as complicated as NiCads, Lithium, NiMh, etc. , just with their own set of rules.

    Repeat with me:...
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    Like G1 said, your meter can not measure AC if...

    Like G1 said, your meter can not measure AC if mixed with DC so you can not measure ripple (you still can measure mains and transformer windings though)
    So "800VAC" means nothing in this case.
    ...
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    Now according to the published schematic R26 must...

    Now according to the published schematic R26 must be 0.33 ohm, yet MrC measures 10 ohm; and R25 should be 10 ohm, yet he measures 0.7 ohm ... which is consistent with a 0.33 ohm + lead and probe...
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    I would troubleshoot a little before random...

    I would troubleshoot a little before random replacing parts.

    1) I see power tubes glow bright purple when you switch amp ON, suspect some nasty LED illuminating them.
    Checked schematic and there...
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    This tells me you have a different schematic...

    This tells me you have a different schematic version from the same amplifier.
    R1 - R2 - vC1 - C2 - etc. are NOT fixed in stone designations, just arbitrary numbers assiogned as designer counts them,...
  22. So you justify having a house or room filled to...

    So you justify having a house or room filled to chest height with dead stuff which "can" be useful one day?.
    I see, I see.
    I mean, I see I can invite you inside my home :D

    I have the faint...
  23. It *is* a small stone,and not even an "amp...

    It *is* a small stone,and not even an "amp version" or whatever but the actual PCB used in the pedal, kludged here.
    Of course an 8 pin SMD IC has NOTHING to do there.
    Poorly mounted at that, just...
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    For a few years now I never supply tubes any more...

    For a few years now I never supply tubes any more ... (unless Iīm building a custom amp that is), but have customers buy and bring them to me.
    Doubly so because we donīt have much choice , an...
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    I sincerely fear asking a simple schematic...

    I sincerely fear asking a simple schematic question here and being browbeat to pulp by tons of vintagekiki data ;) :thumbsup: :thumbsup:
  26. Well, my shop and half my home burnt because I...

    Well, my shop and half my home burnt because I forgot to turn OFF my homemade speaker glue drying oven, capable of curing 12 x 10" or 6 x 12" speakers in a single sitting.
    I have only myself to...
  27. Try now. Ugh! ... been unexpertly tampered...

    Try now.
    Ugh! ... been unexpertly tampered with.
    That chipboard is carved for no good reason and is currently crumbling, Iīd replace a palm sized piece of it with properly glued and clamped...
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    Both are very valuable goals, but in interest of...

    Both are very valuable goals, but in interest of practicity pick one first :)

    Also the time scale is different: starting with known and tweaking is a short path with relatively little unknowns,...
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