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 Post subject: TUBE 0A3
PostPosted: Jul Sat 20, 2019 2:28 am 
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Joined: Jul Mon 11, 2016 5:54 pm
Posts: 339
Location: Lansdale,PA 19446
How do you test a 0A3 tube Its not listed for my Hickok 600A Tester

thanks
Skip


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 Post subject: Re: TUBE 0A3
PostPosted: Jul Sat 20, 2019 4:33 am 
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Joined: May Tue 30, 2006 4:46 pm
Posts: 9970
Location: Santa Rosa, CA
It's a gas regulator tube. Usually, if it glows, it's good.

http://www.mif.pg.gda.pl/homepages/fran ... /0/0A3.pdf

If it's in equipment, measure the voltage from anode to cathode. Should be 105 Volts +/- a couple of percent.

Rich


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 Post subject: Re: TUBE 0A3
PostPosted: Jul Sat 20, 2019 8:08 am 
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Location: Tucson, Arizona U.S.A.
Quote:
Should be 105 Volts

0A3 is 75 volts.

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Jim Mueller


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 Post subject: Re: TUBE 0A3
PostPosted: Jul Tue 23, 2019 10:40 am 
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Joined: Sep Thu 23, 2010 6:37 am
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Location: Powell River BC Canada
I seem to remember it glows orange , not blue.

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de
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 Post subject: Re: TUBE 0A3
PostPosted: Jul Tue 23, 2019 6:46 pm 
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Joined: May Tue 30, 2006 4:46 pm
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Location: Santa Rosa, CA
Whoops! It is 75 volts! :oops:

Rich


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 Post subject: Re: TUBE 0A3
PostPosted: Jul Tue 23, 2019 11:39 pm 
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Joined: Jun Fri 19, 2009 6:34 pm
Posts: 8677
Location: Long Island
Unless a tube tester is built having adequate power supplies, load resistors, and voltage scales on its meter, it cannot test voltage regulator tubes. The bigger Hickok tube testers have these features but not the smaller field service models.

Generally speaking, testing a VR tube requires you to determine the striking or starting voltage, and the voltage drop across the tube stays within spec at rated pass current (see RCA Tube Manual for details). If you cannot test the tube in a piece of equipment, you can do it on the bench with a HV bench power supply, suitable series load resistors, and a voltmeter and milliammeter.

For the 0A3, the tube should strike or begin to conduct before the voltage across it reaches 100-V. The voltage drop across the tube should remain within five volts as the current through it is varied between 5-mA and 40-mA.

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 Post subject: Re: TUBE 0A3
PostPosted: Jul Wed 24, 2019 9:25 am 
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Joined: Nov Mon 02, 2009 7:01 am
Posts: 3656
Location: Lincoln City, OR
Greetings to Skip and the Forum:

This comes up every once in a while. Please take a look at the following thread. Scroll down to my post. You will find not only an exact procedure for testing VR tubes but a table of common VR tube characteristics and a schematic of a test jig to facilitate such testing.

viewtopic.php?f=8&t=189335&hilit=+Regulator

Here's a better drawing of the test fixture than is in the above thread:

Attachment:
VR Tube Test Jig.pdf [10.26 KiB]
Downloaded 31 times


Regards,

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