[Milsurplus] Bringing up old klystrons

[Peter Gottlieb]

Thank you very much.  Your knowledge, and your sharing of it, are appreciated.


On 6/9/2011 7:58 AM, jmfranke wrote:
> 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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>
>
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