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In Reply to: RE: Voltage regulator gas tube question posted by vetmedrobert@gmail.com on July 26, 2017 at 09:19:27
No, it's not defective. The RCA tube manual states the 0A2 anode voltage drop can range from 140 volts to 168 volts.
It's just normal variation from tube to tube. Also, the tube can take 20 minutes or so to stabilize at its normal voltage. And over the life of the tube that voltage may drop some.
Whenever you are checking out a component like that you need to pay careful attention to the operating conditions and tolerances.
Follow Ups:
http://www.ez260.com/rca-0a2-datasheet/
I would suggest the tube is faulty.
Regulation of this stabilizing tube should be typically within 2V and max 6V from 150V reference, as per the datasheet.
"Regulation of this stabilizing tube should be typically within 2V and max 6V from 150V reference"
The number "150" doesn't even appear in that datasheet. It clearly denotes the minimum tube value as 140V and maximum as 168V. 6V is the maximum variation resulting from changes in tube current, with 2V being typical.
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Buy Chinese. Bury freedom.
You are correct, my error.
I can say that having tested 40x VR tubes in the same circuit that they all measured within 1 Volt of nominal value - so my interpretation was based on personal bias.
Having looked at additional data sheets only confirms that your point is correct.
Shane
Thanks, I was looking at 0A2WA data sheet not thinking there would be any differences. Should have referred to RCA 0A2 data sheet since that was what I was using.
The 0A2 and 0A2WA have similar tolerances.
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