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Old 7th May 2004, 09:34 PM   #1
Jhovis is offline Jhovis  United States
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Default Tube Safety

I know I saw something on safety tips while building an amp. I searched and didn't find anything. Could someone point me to the link or site that I saw? I'm about to start building some amps and a preamp and all I've ever built is speakers. At least I do know resistors from caps.
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Old 7th May 2004, 09:37 PM   #2
SY is offline SY  United States
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Here's a good place to start:

Safety Practices, General and Ultra-High Voltage
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Old 7th May 2004, 10:32 PM   #3
Jhovis is offline Jhovis  United States
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Yes, indeed, that looks like a good place to start.
Thanks!
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Old 7th May 2004, 11:28 PM   #4
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Katherine Hepburn said to Spencer Tracey "Never Assume" -- (I think the movie was "Desk Set", but I wasn't born then...)

now my kid's high school chemistry teacher said "Assume" makes an *** outta U and ME, so here are some tips:

never assume that a capacitor is discharged
never assume that the unit you are working with is unplugged
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Old 8th May 2004, 12:35 AM   #5
Jhovis is offline Jhovis  United States
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Discharging caps was my main concern. I have to figure out how to do that.
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Old 8th May 2004, 01:40 AM   #6
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how not to discharge a shotgun shell:
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File Type: jpg blowncap.jpg (33.2 KB, 202 views)
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Old 8th May 2004, 04:54 PM   #7
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Quote:
Originally posted by Jhovis
Discharging caps was my main concern. I have to figure out how to do that.
A resistor, of sufficiently high resistance and power rating, attached across the capacitor with a well insulated tool in one hand and the other in your back pocket.

Too low a resistance (like a pair of pliers ) and sparks, explosions, and arc-welding may occur.

You are very prudent in asking such questions.

Good luck, and Welcome,

George Ferguson
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Old 9th May 2004, 05:04 AM   #8
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Quote:
A resistor, of sufficiently high resistance and power rating, attached across the capacitor with a well insulated tool in one hand and the other in your back pocket.
And also make sure your arm isn't resting on the chassis!
Never use no matter how tempting; A SCREWDRIVER!
I use a dedicated 18k 1000V 3W resistor test lead combination just for that purpose. Works very well for me. For voltages over 400V I use a 39k 1000V 7W resistor, salvaged from a tube TV. Of course you have to take into account voltage/capacity = current!

Wayne
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