GS-36B is the same tube as a the 4CX400A. See link below.
http://www.df6na.de/df6na/gs36b.htm
Larry N5BIP
-----Original Message-----
From: Larry Carman [mailto:lncarman@swbell.net]
Sent: Monday, December 04, 2006 6:35 AM
To: 'amps@contesting.com'
Subject: RE: [Amps] need new or used 4cx400a tubes
My friend ask specifically for 4cx400a tubes needed.
Thanks,
Larry N5BIP
-----Original Message-----
From: Bill Fuqua [mailto:wlfuqu00@uky.edu]
Sent: Friday, December 01, 2006 10:29 AM
To: Larry Carman
Subject: Re: [Amps] need new or used 4cx400a tubes
Do you mean 4-400A glass envelope tetrode tubes?
Or 3CX400A7 ceramic triodes?
73
Bill wa4lav
At 08:29 AM 12/1/2006 -0600, you wrote:
>I'm looking of some new or used 4cx400a tubes for a local ham.
>
>Thanks.
>
>Larry N5BIP
>
>
>
>
>
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