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  1. My go-to box for this sort of thing is an ART...

    My go-to box for this sort of thing is an ART Tube MP/C ( https://www.sweetwater.com/store/detail/TubeMPC--art-tube-mp-c ). It's a nice little mono preamp with both 1/4" and XLR inputs, gain and...
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    Thank you! (So sorry I missed seeing this post...

    Thank you! (So sorry I missed seeing this post for two weeks!)

    -Gnobuddy
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    Nowadays the amp weighs 3 lbs, makes 1000 watts,...

    Nowadays the amp weighs 3 lbs, makes 1000 watts, and is the size of an ice-cube. But the speaker/cab is still the size of a 'fridge and weighs 200 lbs...

    -Gnobuddy
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    A couple of years ago, I found out for the first...

    A couple of years ago, I found out for the first time about the Warsaw Radio Mast, which was the worlds tallest structure for many decades ( https://en.wikipedia.org/wiki/Warsaw_radio_mast ).

    The...
  5. There are multiple types of right-angle clamps...

    There are multiple types of right-angle clamps that make this job much simpler, and much less error-prone.

    Here are a few:

    1)...
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    Well, the very first sentence does say "Our...

    Well, the very first sentence does say "Our vacuum tube industry is manufacturing hundreds of types of radio tubes, many of which are obsolete." So the writer(s) were aware that not all the valves...
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    +/- 120 volts? Yikes. Definitely in dangerous...

    +/- 120 volts? Yikes. Definitely in dangerous territory, and capable of nearly a kilowatt into 8 ohms. I've never worked on an amplifier with that much power.

    The current crop of stereo bridged...
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    About ten or twelve years ago, I was soldering...

    About ten or twelve years ago, I was soldering together a rechargeable battery pack using A123 LiFePO4 cells extracted from a 32 volt Dewalt cordless battery pack. Fully charged, each cell has about...
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    There are a lot of days on which I feel like Rip...

    There are a lot of days on which I feel like Rip Van Winkle, having woken up in an alien future world where so much has changed that nothing makes sense any more. :D

    It's probably a safe guess...
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    Speaking only for myself, the main lesson I...

    Speaking only for myself, the main lesson I learned from that story was to actually pay attention to the stability of the chassis I'm working on - before I plug it in!

    So I'll position the...
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    The rubber apron sounds like an excellent idea....

    The rubber apron sounds like an excellent idea. :thumbsup:

    One of the scary stories I read on the 'Net was about a guy who was working on a valve amp (powered on) outdoors, shirtless, in hot...
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    To err is human, right? It happens to all of us,...

    To err is human, right? It happens to all of us, we either get careless, or we get tunnel vision. The best we can do is set up procedures so that any single mistake by itself isn't fatal.

    Multiple...
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    That sounds like a good idea! On the Aussie...

    That sounds like a good idea!

    On the Aussie Guitar Gearheads forum, new DIY builders are encouraged to wire a neon-bulb indicator across the B+ supply before they ever power their new amp on. If...
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    Unlike most of you here, I only began working...

    Unlike most of you here, I only began working with valve electronics a few years ago. Horror stories I found on the Internet, similar to the ones you've all been telling in this thread, convinced me...
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    Well, that changes things! Now you have...

    Well, that changes things!

    Now you have one-third of the total signal voltage across the 4 ohm speaker, and two-thirds of it across the 8 ohm speaker.

    That means the 8 ohm speaker has twice as...
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    Agree with you totally. But Daz did say "of the...

    Agree with you totally. But Daz did say "of the same model". Speaker designers often try to make their 4 and 8 ohm versions of the same speaker have about the same efficiency (they will tweak both...
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    All else being the same, and assuming the...

    All else being the same, and assuming the speakers are in parallel, the 4 ohm speaker draws double the power from the amplifier.

    Double the power might sound like a lot, but our ears have...
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    Exactly, and it is only those few percent of...

    Exactly, and it is only those few percent of people who make life worth living!

    Keep in mind too, countries that are run entirely by large powerful countries are the ones most likely to have...
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    Looks good, thanks for sharing! As it happens,...

    Looks good, thanks for sharing! As it happens, I'm just at the tail end of an amp project of my own, and am trying to figure out how to make a badge for it (a friends initials).

    (I'm trying two...
  20. I disagree, so lets count them! First, let's...

    I disagree, so lets count them!

    First, let's do a quick approximate calculation:

    1) One octave from 20 Hz to 40 Hz.

    2) One octave from 40 Hz to 80 Hz.

    3) Taking your 5 KHz upper limit,...
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    You did the right thing. In an increasingly...

    You did the right thing. In an increasingly unethical world, you did the right thing. A couple of thousand bucks is a lot of money right now, but in ten years, a hundred times as much money will...
  22. Sorry about that, I seem to have accidentally...

    Sorry about that, I seem to have accidentally posted thumbnails rather than the full-size images I intended to.


    There is certainly room for some discussion, but the bottom line is still that...
  23. In case this is of any interest, here are two...

    In case this is of any interest, here are two pics, one of the graphic EQ settings that sounded best (clean guitar, 6.5" speakers with extended treble response compared to guitar speakers), and the...
  24. I would say the guitar bandwidth is limited by...

    I would say the guitar bandwidth is limited by the nature of the instrument (there's nothing musically attractive above a few kHz). But we're essentially in agreement...


    I may have failed to...
  25. I applaud both your efforts, but I wonder if...

    I applaud both your efforts, but I wonder if attempts to improve on Leo's "cheapest tone control in the world" don't fall under the umbrella of trying to polish the proverbial turd? :(

    The two-pot...
  26. Thank you for the measurements and pics! ...

    Thank you for the measurements and pics!

    Having grown up with semiconductors, it only recently dawned on me just how high the output impedance of a no-feedback, pentode-output guitar amp would be....
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    Okay, you don't need chorus if you have Tuck &...

    Okay, you don't need chorus if you have Tuck & Patti's level of talent. :D

    (And if you do a complete re-interpretation of the song as well. Which, of course, is a perfectly valid artistic choice!)...
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    I use a graphic EQ pedal for all sorts of tone...

    I use a graphic EQ pedal for all sorts of tone tweaks. I think these are the most overlooked guitar FX pedals out there. They don't make a huge dramatic change to your sound like kicking in a hot...
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