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    Absolutely true. And in our case here, since the...

    Absolutely true. And in our case here, since the physical components come with an 'acceptable error range', then the answer to the problem above becomes:
    1/(2PiRC) =...
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    If you haven't already, I think you'd like...

    If you haven't already, I think you'd like reading Goedel, Escher, Bach It combines music, math, and fascination in deep and entertaining ways.
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    To 7 digits, 1 million divided by ( 2 Pi ) is...

    To 7 digits, 1 million divided by ( 2 Pi ) is equal to 159155, so there's nothing wrong with your shortcut at all.

    I have to ask, though, are you often caught doing this math on paper? I'm never...
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    This was done with unmagnetized pole pieces,...

    This was done with unmagnetized pole pieces, demonstrating how the AlNiCo interacts with a field produced by the coil? I can see that A5 is different than the others, but I'm not certain that if I...
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    So for an experiment with two Fender-type coils,...

    So for an experiment with two Fender-type coils, one with A2 and one with A5: If we are given that the pole pieces are the same size, have uniform construction, are positioned in the coils the same...
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    I think the OP's question is hypothetical? But...

    I think the OP's question is hypothetical?

    But yours is a fair question. I know nothing about magnets, but for settling hypothetical versus realistic can we say:
    1. Is it possible/likely to find...
  7. It's the nature of mind to find patterns - often...

    It's the nature of mind to find patterns - often seeing them where there is none. I might see unicorns or spaceships when I look at the clouds. Are they there by design? I can't deny that I see them.
  8. Didn't the AC15 originally have a very high-gain...

    Didn't the AC15 originally have a very high-gain input stage with an EF86? How close to a very British AC15 could this thing be nudged?

    off topic: I purchased Hammond's replacement OT (10k...
  9. OK. So i took a brief look at the scope traces....

    OK. So i took a brief look at the scope traces. Which of those traces look most like what you see at the speaker? What's the earliest trace that look most like what you see at the speaker? Whatever...
  10. So what happens to the bias on the second stage...

    So what happens to the bias on the second stage when being driven by that high signal? I haven't looked at the schematic, just thinking blocking distortion from your description of the sound.
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    Oh, You're really missing out! EVERYBODY in the...

    Oh, You're really missing out! EVERYBODY in the U.S. drinks it, every day! ;)
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    Someone once regaled me with the story on...

    Someone once regaled me with the story on posidriv screws, something about manufacturers and suppliers angling for exclusivity with the automakers, I think. That's why there are so many types of...
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    I have a few phillips-head drivers that I ground...

    I have a few phillips-head drivers that I ground the tip off of so that they would fit 'better' in a Reed-Prince screw. Saved my butt many times.

    I have a hunch that many of the screws in the...
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    Chuck beat me to the 'size matters' point, but it...

    Chuck beat me to the 'size matters' point, but it bears repeating. It only took me 30 years to realize that a properly-sized screwdriver in a well-made (not junk) screw will fit with absolutely no...
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    Insert "ionized-hair smiley thing" here

    Insert "ionized-hair smiley thing" here
  16. Drawing and posting at least the section of the...

    Drawing and posting at least the section of the circuit where these devices were, showing them in circuit (identified with a question mark?) will help us answer those questions. Really, take a...
  17. What was the other tube's calculated dissipation?...

    What was the other tube's calculated dissipation? Also, posting the voltage across your 230R cathode resistor will help me get a better idea of what you're facing. And I'm assuming the plate voltages...
  18. If you have questions about the amp, even - or...

    If you have questions about the amp, even - or especially - with questions about the component function, start drawing out a schem for us and yourself. Input circuitry, power supply, output section,...
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    I can pull dead computer power supplies out of...

    I can pull dead computer power supplies out of the recycling bin at work pretty much any week of the year. I've got a small pile of heat sinks from those stockpiled.

    Also a nice chrome-plated PSU...
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    I occasionally put up a snap from the backyard,...

    I occasionally put up a snap from the backyard, or some other nature scene. But my primary requirement is to keep my desktop icons visible amid the clutter. So mostly simple or no pictures for me.
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    All good questions, and welcome to the forum!...

    All good questions, and welcome to the forum!
    Preamp tubes generally are used in a circuit that makes them self-biasing, so that they do not need to be biased by the user.

    edit: I see other, more...
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    OK, amend that to read "after every time they...

    OK, amend that to read "after every time they touch the strings". The point being: some people are so toxic the strings don't last a day. Understand that the chemical reaction between strings and...
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    Some players changes their strings after every...

    Some players changes their strings after every show, maybe every day. Sweat and whatever else - coffee, beer, tobacco - will kill the 'zing' and 'ring'.

    You know they say "tone is in your...
  24. I'd hear piano tuners complain about how the...

    I'd hear piano tuners complain about how the harmonics were 'sharp', but I'd always attributed it to the way tuning by perfect 5ths results in a wolf tone (aka wolf interval), about 1/4 step sharp...
  25. Right. Any whole number that can be factored by 2...

    Right. Any whole number that can be factored by 2 until the factoring is no longer possible reveals the lowest harmonic that that number (harmonic) is an octave of.
  26. I agree with that as written. In fact, I'd love...

    I agree with that as written. In fact, I'd love to discuss the relative merits of equal temperament vs. the temperaments that Bach, et. al., favored; alas that ship sailed over 250 years ago. My...
  27. Yes. Harmonics are whole number multiples of the...

    Yes. Harmonics are whole number multiples of the fundamental frequency, so if the fundamental freq is defined as 1 cycle per (pick your units), then the harmonics are 2, 3, 4, etc. Ratios of small...
  28. well, internet lore suggests that a signal...

    well, internet lore suggests that a signal through a single preamp tube distorts in a way that adds 2nd harmonics. The mechanism is that one half of the waveform is distorted differently than the...
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