[Milsurplus] Bringing up old klystrons

[jmfranke]

There are no issues with powering up a 2K25 or 723A/B X-band klystron. Just 
treat it as a regular vacuum tube. When making your own circuit designs, it 
is important to make sure the repellor or reflector never goes positive with 
respect to the cathode. Otherwise the element could heat up and outgas. 
Also, in most designs, the cavity is about 300V positive with respect to the 
chassis. Since the metal envelope and output coax probe are part of the 
cavity, the outside of the tube and probe are at 300V.

John  WA4WDL


--------------------------------------------------
From: "Peter Gottlieb" <nerd at verizon.net>
Sent: Wednesday, June 08, 2011 9:34 PM
To: "Milsurplus" <milsurplus at mailman.qth.net>; 
<Vintage-Military-RADAR at yahoogroups.com>
Subject: [Milsurplus] Bringing up old klystrons

> I found a very nice old TS-148 X-band spectrum analyzer and would like to 
> power
> it up.  It would appear it hasn't been touched i a good 50 years.
>
> The LO is a 2K25 klystron.  Do I need to observe any special precautions 
> or
> procedures powering this tube up?
>
>
>
>
> On a separate note, I picked up an interesting RF PC board assembly at 
> NEARfest
> which has a little SMA amplifier brick which turns out to be a 12 dB gain 
> LNA
> for 9-10 GHz.  It would be interesting to see if it worked as a front end 
> preamp
> for the TS-148!  Talk about differences in technology!
>
> I have a TS-147 coming in tomorrow to use as a source...
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