[Amps] Gettering 3-500 Tubes

[Carl]

Chinese 572B's are rarely gettered sufficiently and will arc at 2400V in a 
SB-200 even in standby at times.

 I always getter them before using. OTOH even 1960's era Cetrons are fine.

Carl
KM1H


----- Original Message ----- 
From: "Glen Zook" <gzook at yahoo.com>
To: "Rick Stealey" <rstealey at hotmail.com>; <amps at contesting.com>
Sent: Sunday, November 06, 2011 1:29 PM
Subject: Re: [Amps] Gettering 3-500 Tubes


Not the SB-200 or SB-201, those amplifiers use 572B tubes. The SB-220 and 
SB-221 use 3-500Z tubes.

Methinks your typing fingers got out of sync with the brain! :>)

Glen, K9STH


Website:  http://k9sth.com


________________________________
From: Rick Stealey <rstealey at hotmail.com>
To: amps at contesting.com
Sent: Sunday, November 6, 2011 6:22 AM
Subject: Re: [Amps] Gettering 3-500 Tubes



> Go ahead and try them as they are after you've gotten the rest sorted out.

But what if they arc over? Isn't that going to do some serious damage to the 
SB200?
If you don't getter them, how about at LEAST put a resistor in series with 
the B+ to limit the current.
A bad tube will still arc (snap) won't it?

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