|[AMRadio] Tube ID|
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!
"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.
> -----Original Message-----
> The OC2 is a 7-pin miniature that glows bright orange; it's a 75-volt
> 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.
>> 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?
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