[MRCA] wuzzit?

[Ray Fantini]

That's a pre WW2 transmitting triode, think it goes back to around the late twenties. Used in Westinghouse and RCA broadcast transmitters and is rated at around 250 watts when used in the PA. they would use four together in a 500 watt transmitter.
Weird trivia! Before deregulation in the seventies the FCC required that you had to be able to see and directly control the transmitter in a broadcast station so a lot of the transmitters built from back in the beginning up to the seventies used huge glass tubes with quiet forced air cooling but after deregulation most manufactures switched to metal tubes and high volume forced air cooling that was loud being you no longer had to see the transmitter when you were on the air.
That's why everyone wants the old Collins, Gates and RCA transmitters for AM Ham opps but the newer generation of transmitters are not as desired.

Ray F/KA3EKH


From: mrca-bounces at mailman.qth.net <mrca-bounces at mailman.qth.net> On Behalf Of Jeep Platt
Sent: Thursday, February 2, 2023 9:04 PM
To: Gene Smar <ersmar at verizon.net>; Military Radio Collectors Association <mrca at mailman.qth.net>
Subject: Re: [MRCA] wuzzit?


Looks like an old X-ray tube I once had.  A curio, to be sure!  K3HVG

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From: mrca-bounces at mailman.qth.net<mailto:mrca-bounces at mailman.qth.net> <mrca-bounces at mailman.qth.net<mailto:mrca-bounces at mailman.qth.net>> on behalf of Gene Smar via MRCA <mrca at mailman.qth.net<mailto:mrca at mailman.qth.net>>
Sent: Thursday, February 2, 2023 9:00:05 PM
To: Military Radio Collectors Association <mrca at mailman.qth.net<mailto:mrca at mailman.qth.net>>
Subject: [MRCA] wuzzit?

Anybody know for sure what this is? I'm thinking a vacuum cap.

The father (non-ham) of a friend recently died and I'm told had a collection of old tubes. I've been asked if someone can use them. Not sure if that means they will be given away or sold but I will be sent more photos of the collection and will post them here. I'll find out more about the giving vs selling question for y'all.

73 de
Gene Smar AD3F
[cid:image001.jpg at 01D937AE.800C57B0]


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