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  1. Replies
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    I think at least a few must have. Member...

    I think at least a few must have.

    Member Nigelwright often posts in DIY Audio about his using the "10 boards for $2" offer and being happy with quality.

    Bare boards, not fully assembled.
    ...
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    Yes, something like that is done to...

    Yes, something like that is done to simplify/quicken day to day checking.

    You still have to "map" the field end to end at least once because it is still strong a couple mm either side of the area...
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    Cool :thumbsup: I saw it and didnīt report...

    Cool :thumbsup:

    I saw it and didnīt report because itīs not crude spam as others but a legit service, although misplaced.

    As a side comment, funny how the World changes; in the old days...
  4. Problem with "messed up" amps is that we donīt...

    Problem with "messed up" amps is that we donīt really know whatīs there.
    It will probably match no known (or unknown) schematic.

    I suggest a longer but safer way to solve both problms: part...
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    Cool :)

    Cool :)
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    :p

    :p
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    In general analysis, yes. But here we have a...

    In general analysis, yes.

    But here we have a section of the whole magnetic circuit, "section" being the dictionary definition, , as in "cutting across and looking at what we find".
    Since radially...
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    Oh, sorry, I only use Ceramics. I mentioned...

    Oh, sorry, I only use Ceramics.

    I mentioned Alnico as an example , people think of it as "a magnet, period" while itīs actually more than that, a VERY HARD steel.

    Iīm adding a FEMA graph of...
  9. Well, thatīs a somewhat simplistic point of view....

    Well, thatīs a somewhat simplistic point of view.

    Tubes by themselves donīt do "magic" automatically.

    They do have some weird quirks which we happen to love, but we must exploit them.

    Just...
  10. Good advice. Hereīs physical dimensions from...

    Good advice.

    Hereīs physical dimensions from Jensen, the only manufacturer which supplies all of them.

    Grab a mm scale ruler and do your measuring.

    P12R:

    ...
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    Oh,TONS of things. ZERO knowledge on digital...

    Oh,TONS of things.

    ZERO knowledge on digital stuff, even less on programming languages.

    Something I should be ashamed of: canīt even **simulate** :tape:

    Neither Spice type circuit simulation...
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    Yes, you are going uphill and slope becomes...

    Yes, you are going uphill and slope becomes steeper all the time.

    In this case "saturation" behaves different.

    Saturated iron does not "stop" magnetic flux, it simply has less and less...
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    Yes. 1) turn amp ON, with bulb, without...

    Yes.

    1) turn amp ON, with bulb, without speaker

    2) recheck you have acceptable offset (43 mV is fine)

    3) without turning amp OFF, connect speaker

    4) if everything fine, apply some...
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    I make my own PCBs and have of necessity learnt...

    I make my own PCBs and have of necessity learnt all the processes.

    That said, I try to simplify and cut costs as much as possible so in general keep them simple.

    PTH can be made, even homemade,...
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    No need for special steels, low carbon rules. ...

    No need for special steels, low carbon rules.

    SAE1008 is standard, sometimes 1018 is used because thatīs all thatīs stocked at sellers.

    For polepieces 12L14 cold rolled round bar stock is...
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    Because results are completely different....

    Because results are completely different.
    Sweeping a coil through the gap gives you the TOTAL flux, which you divide by gap surface to calculate AVERAGE flux density .

    With the added uncertainty...
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    Wow!!! I guess weird and kinky are just...

    Wow!!!
    I guess weird and kinky are just understatements :tape:

    Besides cosmetic choices and even the full switched everything approach, to each his own, I find *one* flawed concept , probably...
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    Because itīs Europe, not USA, Japan or China. ...

    Because itīs Europe, not USA, Japan or China.

    1 Month fully paid vacation is Workerīs and everybody elseīs right.

    From...
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    With due respect, Italian boards seem to be VERY...

    With due respect, Italian boards seem to be VERY high quality fiberglass ones, **double thickness** compared to any board out there, by any maker, and both sides covered in black or white epoxy...
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    In due order: }Yes. You are lucky, this one...

    In due order:

    }Yes.
    You are lucky, this one is more repairable.
    The LM391 one requires one of them, of course, and are as rare as henīs teeth.

    Yes.


    That is a problem and usually means...
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    A friendīs brother who received Electronics...

    A friendīs brother who received Electronics lessons from him and resented it, designed an "OFF Switch" .... a N.O spst switch wired across Mains: you flip the toggle and turn everything OFF .
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    Thanks :) I expected a driver IC on the other...

    Thanks :)

    I expected a driver IC on the other side of the Transformer and very intrigued by finding none. WTF?
  23. Yes, in fact itīs already too diluted compared to...

    Yes, in fact itīs already too diluted compared to the dedicated speaker edge sealant.

    But itīs not exactly "silicone" but artificial "latex".
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    Easy, just replace incumbent fuses with >20A ones...

    Easy, just replace incumbent fuses with >20A ones taken from nearest car or motorcycle or wrap burnt ones with aluminum foil, then turn on 20 times and watch parts smolder while scratching your head...
  25. The Isle of Wight video starts with Loud and...

    The Isle of Wight video starts with Loud and Clean Hiwatt.
    And then at 2:30 he goes back, near the amps, and steps on some nasty distortion pedal.
    Anybody trying to get that sound from Guitar +...
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    Well, it *does* sound good: ...

    Well, it *does* sound good:

    https://www.youtube.com/watch?v=lwCZZEBgqg8
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    Cool. A perpendicular picture, with PCB filling...

    Cool.
    A perpendicular picture, with PCB filling screen end to end and all parts visible would be fine.
    Same but from copper side would be the icing on the cake.
  28. :thumbsup:

    :thumbsup:
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