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Do you have any test equipment in your lab that uses vacuum tubes?
5065AGuru:
Hi,
Just wondered. The only vacuum tube test equipment I have is an HP 428B clip on Ammeter. It is one of my favorite instruments and warms up in less than 30 Seconds!
Cheers,
Corby Dawson
capt bullshot:
https://www.eevblog.com/forum/chat/spot-the-test-equipment-%28find-the-hidden-object-with-the-picture%29/msg1412775/#msg1412775
Berni:
While most of my equipment is rather old it still tends to have at least early ceramic DIP ICs in it.
The one i do have is a Fluke 410B (Precision HV Power supply)
https://testequipment.center/Products/Fluke-410B
It is modern enough for its control circuit and reference to be silicon, but it still uses incandescent lamps as indicators on the front panel. But since this thing can output up to 10kV they couldn't get a transistor to handle that, so there is a big fist sized vacuum tube inside working as a linear pass element to regulate the output.
You would know the thing has vacuum tubes inside without even opening it up because the heater on this tube runs so hot that you can see the bright orange light shining out of all the vent holes in the back area.
Smith:
I regularely use the HP 412B 2kV HV supply, basicly a 2kv version of the 410B. Its so easy to use, and verry precise. It only needed a new cap for the internal reference a few years back. The downside is the 32mA output, almost 32mA more than 1 need. The output is in series with a relay that should eventually kick in above the 32mA. Colleague got a shock from the his 3kV version once (415B), he was not amused.
fourfathom:
Do Nixie tubes count? My old HP freq counter has these. I also have a variable high-voltage power supply with some big vacuum tubes, but I haven't plugged it in for a very long time.
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