| Looking for a color code [message #8823] |
Thu, 17 February 2005 17:57  |
PakProtector
Messages: 935
Registered: May 2009
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Illuminati (2nd Degree) |
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Hey-Hey!!!,
I am hunting a colour coding sheet for tantalum anode transmitting valves. Some of the data sheets I have read say something like, "consult the colour code for plate dissipation analysis". They speak of a red-yellow colour when the plates reach max dissipation.Anybody have such a thing? or do I have to guess with valves old enough to be my grandfather?
regards,
Douglas
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| Re: Looking for a color code [message #8825 is a reply to message #8824] |
Fri, 18 February 2005 01:06  |
metasonix
Messages: 103
Registered: May 2009
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Viscount |
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dayam....that's one of the most obscure items of tube documentation in the world. Have seen one that Eimac published more than 50 years ago, but don't have a copy. The color printing was kind of primitive and the colors were questionable anyway. I could ask on the Tube Collector's Assoc. maling list if you wish.
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| as with anything else Tube... [message #8826 is a reply to message #8825] |
Fri, 18 February 2005 07:05 |
PakProtector
Messages: 935
Registered: May 2009
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Illuminati (2nd Degree) |
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The journey is a lot of the fun. I figured it was obscure. *Most* obscure is an accomplishment for sure. I have been looking at some of the old TX triodes for a linestage and/or driver valve in a high-voltage amp. Tantalum plates seem to be a neat idea if I can get a few of them w/o breaking the bank.
regards,
Douglas
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| D-Oh!!! [message #8828 is a reply to message #8827] |
Fri, 18 February 2005 13:23 |
PakProtector
Messages: 935
Registered: May 2009
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Illuminati (2nd Degree) |
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The blinders got me again. I have one of them too. And it is printed in fairly new ink and on good paper too. Can't be all that far off. Further thought yeilds the additional conclusion: I am not going to run them hard in the first app I put them to, so I'll probably be able to put the old ME Materials book to good use. thanks! good thing I was not looking for poisonous snakes....I'd have been bitten.
regards,
Douglas
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| Re: D-Oh! [message #8831 is a reply to message #8828] |
Fri, 18 February 2005 21:39 |
Poindexter
Messages: 108
Registered: May 2009
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Viscount |
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Doug, these are called 'black body radiation spectra', and as far as I know, do not depend on the material radiating. I studied this stuff when I was making knives and swords and such, and got pretty good at judging temperature by color. If I remember, dull red is about 900°, full red is about 1100°, red-orange is about 1200-1300°, and your golden orange is up at about 1400-1500°; these all in fahrenheit. Keep your lovely devices in the orange range, and you ain't gonna be a sad hippie. Yer pal, P.
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| Re: D-Oh! [message #8833 is a reply to message #8831] |
Sat, 19 February 2005 21:58 |
PakProtector
Messages: 935
Registered: May 2009
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Illuminati (2nd Degree) |
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That anode must be something special to operate at that Temp. Not to mention being its own getter. I have yet to find any, I may have to put in a weeks worth of work in a big house of tubes to find any( and w/no guarantees ). Time will tell, and there are other cool things to play with too.
regards,
Douglas
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