[Milsurplus] Oddball Tube: Microwave Amp?

[Jim Whartenby]

I agree with Glenn that the tubes are either ceramic or pencil triodes but it looks to me like there are two tubes inside the cavity.  I see feed-through capacitors for two grids, two cathodes, two heaters and two tuning caps or plungers.  Didn't note any plate feed-through caps so they must be at ground potential.
Should be easy to ohm out the heaters to see if they are connected to one or two tubes.  Apply 6.3 volts to the heater feed-through and ground; if current is about 250 mA then the tube is likely a 7077, if current is 135 mA then it might be a 5876.  There are other similar planer triodes which may have different current demands.  GE ceramic tube data is somewhere on the 'net.Nice find,Jim

      From: Glenn Little WB4UIV <glennmaillist at bellsouth.net>
 To: milsurplus at mailman.qth.net 
 Sent: Sunday, February 4, 2018 9:56 PM
 Subject: Re: [Milsurplus] Oddball Tube: Microwave Amp?
   
I highly suspect that this is an assembly and not a tube.
It looks like it might unscrew near the center.
If it does, I suspect that you will find a 7077 or similar tube inside.

I could be wrong and it could be a klystron or something similar.

73
Glenn
WB4UIV
On 2/4/2018 2:08 PM, David Stinson wrote:
> Here's an oddball tube.  "Input" on one end,
> "Output" on the other, with tube element
> connections between.  Anyone familiar?  Know how
> to hook it up?
>
> https://photos.app.goo.gl/9be5plc6QLWlWlps1
>
> 73 Dave AB5S
>
>
>
>
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Milsurplus at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

-- 
-----------------------------------------------------------------------
Glenn Little                ARRL Technical Specialist  QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv at arrl.net    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI LM  NRA LM  SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"

______________________________________________________________
Milsurplus mailing list
Home: http://mailman.qth.net/mailman/listinfo/milsurplus
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Milsurplus at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html


   
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20180205/db377ba4/attachment.html>