The simplest, scariest "spud amp" I have yet seen
mhardy6647
Posts: 34,067
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"
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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