[AMRadio] Tube ID

Kim Elmore cw_de_n5op at sbcglobal.net
Sun Feb 23 13:07:39 EST 2014

Like so man things, I can't help but think that "back in the day," the guys that worked on this stuff knew exactly what it was based only on the color. At least, I like to think so!

Kim N5OP

"People that make music together cannot be enemies, at least as long as the music lasts." -- Paul Hindemith

> On Feb 23, 2014, at 11:06, "Jim Wilhite" <w5jo at brightok.net> wrote:
> Thank you Larry, Rob and Kim,
> I read about some examples on the net that Kim found but they all were the octal base.  I also found a data log but they did not have a spec sheet or picture on the OC2.
> The deal is the tube was in the regulator circuit in an NC 183D that I bought last week.  The specs for the receiver calls for the OB2 which is a 105 V regulator.  In all my years I have never run across the OC2 in the miniature envelope which is the one you mention.  I am not sure if someone before me wanted to run the regulated voltage at 75 or they didn't have an OB2 so they just installed the OC2.
> In any case thanks for the information guys.  I recall reading an article about the color of the regulator tubes and which type of gas causes the color but could not find it.  There is a lot of that type of information on guitar and audio sites but they don't have the spec sheets posted.
> 73
> Jim
> W5JO
> -----Original Message----- 
> The OC2 is a 7-pin miniature that glows bright orange; it's a 75-volt
> regulator.
> If you have access to a TEk 575 or similar curve tracer it's very easy
> to measure, also it's almost as easy with a bench supply, current
> limiting/voltage dropping resistor, and a voltmeter.
> 73,
> -Larry/NE1S
>> On 2/23/14 8:02 AM, Rob Atkinson wrote:
>> Hi Jim,
>> I think I'd measure the voltage at that tube's socket and stick a
>> known VR tube in there for that voltage and see what happens.  But, my
>> knowledge is somewhat limited.  I guess a VR tube with neon in it
>> would glow orange.   5651 and 5651A are miniature neon VR tubes I
>> think.  90C1 or 85A2?
>> 73
>> Rob
>> K5UJ
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