[Amps] Thanks for help on pricing 4-1000A plus another question

[Harold Mandel]

Robert,

If you're a purist and have a couple of dollars to spend,
Manny at Zonum Industries in California can do a seven-part 
performance test on most transmitting tubes.

Many broadcasters send their questionables and duds there for evaluation
prior to rebuilding.

http://www.zonumindustries.com 

Hal
W4HBM


-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Robert Groh
Sent: Wednesday, February 21, 2007 1:53 PM
To: amps at contesting.com
Subject: [Amps] Thanks for help on pricing 4-1000A plus another question

Thanks to all of you who sent emails giving me some pointers on the value of
the 4-1000A I listed for sale a couple of days ago. I'll incorporate all of
those comments when I list the tube for sale. 

As sometimes happens, I've come up with another question on this general
subject to ask the group - is there a reasonable way I can test the 4-1000A
without plugging it into a full blown RF amplifier? 

I do have the power supply and the rf decks that came with the tube. The rf
decks, frankly, scare the living daylights out of me - fully open
construction, high voltage (also all open construction, I might add), etc.
However I might be able to, with a great deal of care, get the beast up and
running - at least far enough to look at idling current. The PS does have
variacs on (I think) both the HV and the filament supplies which would imply
that I can sneak up on operation. Can I tell enough without applying RF?
Certainly I can verify that the filaments light. I suspect that (depending
on grid bias etc) there is some amount of idling plate current I should
draw. I suspect I might be able to detect if it is gassy, etc.

Anyways I would certainly appreciate any thoughts anyone might have. 

Thanks again for the help up to this point.

73
Bob Groh, WA2CKY

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