[Heathkit] off topic question, sort of

[crawfish]

I have a copy of such a tester in the VHF Handbook by Bob Brown. Now, to
find the book...
                                                Joe W4AAB
----- Original Message -----
From: "jeremy-ca" <km1h at jeremy.mv.com>
To: "Murray Grandy" <mgrandy at telus.net>; "HEATHKIT LIST"
<heathkit at mailman.qth.net>
Sent: Sunday, October 07, 2007 9:29 AM
Subject: Re: [Heathkit] off topic question, sort of


> Any tube can be evaluated as long as the constant current curves are
> available which it is for the 4-400.
> Build up a test jig with filament, adjustable bias, screen, and a HV of
> 1000-1500V. Also some form of cooling; Ive used a squirrel cage unit
blowing
> on the side of the tube for up to 4-1000A's.
> The bias supply will need to have negative and positive output.
>
> If you have a SB-220 (or just about any 3-400Z/3-500Z amp) available it
can
> be plugged in and evaluated as GG in the CW position. Drive it with 40-50W
> for a short period ONLY as the cooling fan is insufficient for the seals
> hidden behind the metal shell.
>
> Carl
> KM1H
>
> ----- Original Message -----
> From: "Murray Grandy" <mgrandy at telus.net>
> To: "HEATHKIT LIST" <heathkit at mailman.qth.net>
> Sent: Sunday, October 07, 2007 2:55 AM
> Subject: [Heathkit] off topic question, sort of
>
>
> DOES ANYONE KNOW OF A WAY OF TESTING TRANSMITTER TUBES SUCH AS 4-400. WAS
> THERE EVER ANYTHING IN ANY OF THE ARRL HANDBOOKS. SEEMS LIKE THERE MUST BE
> SOME WAY TO JERRY RIG SOMETHING THAT WOULD DO A BASIC KINDA TEST.
> Murray
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