Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => AmpTools/Tech Tips => Topic started by: PRR on December 07, 2013, 04:11:19 pm
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Sweet! Love the 800 ohms per volt rating on the voltmeter.
That's precision!
"With every measurement, an opportunity to apply Ohm's law!"
I thought you were going to post that military-electronics training pix you posted some time back with the VTVM with a 3 foot x 3 foot meter face. That was pretty cool.
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Looks like this may be their current (no pun intended) incarnation: http://www.jewellinstruments.com/ (http://www.jewellinstruments.com/)
That service bench may bench may be out of production. :sad:
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When I remember, I'll take a picture of mine. I built it partly for yucks, and partly so I can measure voltage cathodes and plates, plus raw B+. I put it together a little at a time using meters from eBay. And true to form, scrap lumber. :laugh:
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Nice Item
K
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> Love the 800 ohms per volt rating on the voltmeter.
It's probably a 1mA meter with +/-20% tolerance.
Apparently <1mA meters were not common, and certainly not something you want mounted solid to a bench. When my 50uA meters have to travel I wrap them gently and hand-carry.
1mA is fine for most radio work. Only the 1st Audio and the AVC system "need" higher sensitivity, to the point that you really need a VTVM, which was not yet common or mature.
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Cool!
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I finally got around to taking a picture. Some things you build just cuz ya wanna.