[Milsurplus] Bringing up old klystrons

[gl4d21a at juno.com]

Peter:

John hinted at this, but I will say it plainly:  The klystron is no problem, the power supply voltages are.  Make sure all of them are within specs (pull the critical tubes and connect temporary loads) before exposing the tubes to them.  They all need to be up and running, not too high nor at zero.

73,
George
W5VPQ

---------- Original Message ----------
From: Peter Gottlieb <nerd at verizon.net>
To: jmfranke <jmfranke at cox.net>
Cc: Vintage-Military-RADAR at yahoogroups.com, Milsurplus <milsurplus at mailman.qth.net>
Subject: Re: [Milsurplus] Bringing up old klystrons
Date: Thu, 09 Jun 2011 08:03:44 -0400

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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