The simplest, scariest "spud amp" I have yet seen
mhardy6647
Posts: 33,801
Serves me right for looking at old copies of Radio-TV Experimenter on worldradiohistory.com 
I mean, with an isolation transformer, it wouldn't be scary any more (at least)
source: https://worldradiohistory.com/Archive-Radio-TV-Experimenter/Radio-TV-Experimenter-1959-7-559.pdf
As to the "X" in the schematic... quoth the text:
mmmm-hmmm...
Now I wanna build one. Those cartridges aren't all that different than a line-level signal (although the loading might be a bit different).
I mean, with an isolation transformer, it wouldn't be scary any more (at least)
source: https://worldradiohistory.com/Archive-Radio-TV-Experimenter/Radio-TV-Experimenter-1959-7-559.pdf
As to the "X" in the schematic... quoth the text:
"Shock that might result from handling metal pick -up arm on a record player can be prevented by inserting a .05 mfd 200 volt paper capacitor at (X) in Fig. 5 and mounting the phono jack on a Bakelite disc. However, most modern pick -up arms are plastic. The only chance for a shock from touching chassis is when you're standing on a damp concrete floor or touching some grounded object. "
mmmm-hmmm...
Now I wanna build one. Those cartridges aren't all that different than a line-level signal (although the loading might be a bit different).
Comments
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Rabbit hole commence....
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I dunno, the world's simplest vacuum tube amplifier may also be the world's worst. It just caught my eye by its sheer minimalism. Besides the tube (combined pentode & half-wave rectifier) and socket, it has a power switch, an RCA jack, a volume control pot, three capacitors (4 with the "death cap"), two resistors, and an output transformer.
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What could go wrong????
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"Sometimes you have to look to the past to understand where you are going in the future"Anger is just anger. It isn’t good. It isn’t bad. It just is. What you do with it is what matters.
You can use it to build or to destroy. You just have to make the choice. Jim Butcher
Harry / Marietta GA -
"if it exists".... man, that is some heavy s#!t, right there.
What could go wrong????
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The more I look at that schematic, the more I marvel that it does anything.
... and that piques my curiosity.
(as in Here. Hold my beer.)
Time to check the big box o'plinkers in the basement.
If you see a WTB ad for a 117L7 (or 117M7)... you'll know why...
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Cold outside and bored inside is not a good ideal place for us audiophiles to be in good luck doc
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Indeed. At least, not when there are high voltages... and particularly if there's a damp floor.Cold outside and bored inside is not a good ideal place for us audiophiles to be in good luck doc
I realized this morning that this is definitely a Hallowe'en-themed thread topic. This is definitely a scary amplifier.
oooooooOOOOOOOOOOOOOOOoooooowooooo...
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