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Whatsit?




 
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WU2D
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CW is just a narrower version of AM


« on: June 06, 2020, 09:20:44 AM »

So what is this?


* Whatsit0.jpg (560.37 KB, 4608x2874 - viewed 258 times.)

* Whatsit2.jpg (370.33 KB, 4608x2864 - viewed 228 times.)

* Whatsit3.jpg (551.72 KB, 4608x2959 - viewed 270 times.)
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w4bfs
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« Reply #1 on: June 06, 2020, 09:25:14 AM »

did ur Ohmmeter tell u anything ?
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Tom WA3KLR
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« Reply #2 on: June 06, 2020, 09:29:18 AM »

UHF/microwave triode? But what number!
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73 de Tom WA3KLR  AMI # 77   Amplitude Modulation - a force Now and for the Future!
MikeKE0ZUinkcmo
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« Reply #3 on: June 07, 2020, 01:28:21 AM »

Tom is correct, I believe.   I faintly remember seeing those 50/60 years ago.   
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Mike KE0ZU

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WU2D
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CW is just a narrower version of AM


« Reply #4 on: June 07, 2020, 06:39:08 AM »

AH it is a 4042. I see that number and 26720 printed on the other side of the heatsink ring.
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Tom WA3KLR
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« Reply #5 on: June 07, 2020, 12:44:55 PM »

This tube is not listed in 'Frank's Tube Data' website nor in my 9 volumes of RCA HB-3's.  But it is listed in Ludwell Sibley's 'Tube Lore' in the RCA chapter:
"Xmtg. glass pencil triode; pulsed osc. giving 425 W pulse at 1.7 GHz."  That's all.

Must have been rarely used and rare, nice find.  The phenolic insulator and lacquer has that WWII look.
 - - - - - -

OMG! I just did some research on the web - it's the oscillator tube in the HP 608 r.f signal generators!
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73 de Tom WA3KLR  AMI # 77   Amplitude Modulation - a force Now and for the Future!
WU2D
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CW is just a narrower version of AM


« Reply #6 on: June 07, 2020, 08:14:25 PM »

So now you know what I just parted out this weekend!
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KA2DZT
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« Reply #7 on: June 07, 2020, 11:32:31 PM »

I parted out a HP-608 a few years ago.  The UHF triode looked familiar. I still have three more HP-608s
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Tom WA3KLR
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« Reply #8 on: June 08, 2020, 04:13:16 PM »

I have a Navy version of a HP608 here.  It is similar to the D model as I recall.  I had to do a fair amount of work on it originally. It was working fine the last I used it, which was a long time ago.  I keep it in case I need to generate 2 signals at the same time.
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73 de Tom WA3KLR  AMI # 77   Amplitude Modulation - a force Now and for the Future!
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Patrick J. / KD5OEI
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« Reply #9 on: June 08, 2020, 07:40:46 PM »

Any time I get an HP 410 VTVM that is unrepairable, I check the probe for the little tube in there. It's getting rare. It's on us all to always check things if they have to be scrapped.
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