[Amps] GS-35B Preparation

[Mel]

......after you get the tube, you need a "burn-in fixture", what I used was a scraped-out ATX computer PS with a hole cut in it to mount the tube (you don't need the chimney at this stage.
 
The GS-35B is a 12.6 volt tube that dissapates 35 watts of heat from the filament.
 
The recommended way to prep the tube is to apply filament volts and let it run for "X" amount of hours/days with plenty of air.  
 
Step 2 is to apply B+ volts to the anode while the filament is lit; not all at once but in steps of "X" amount of voltage for "X" amount of hours/days until you reach the maxmum amount of B+ that will be used in the amplifier.  This step should be performed in the amplifier with chimneys installed and pressurized air blowing through the tube.
 
The are knowledgible people who would recomment that you test the tube with a HV Megohmeter but unless you are planning on running 2-3 times the suggested level of B+ volts I do not believe this is necessary.
 
Use a Triode control board or a W4ZT Bias board and not a fixed Zener Diode.
 
.
 
 
 
--- On Thu, 8/19/10, Lee Buller <k0wa at swbell.net> wrote:


From: Lee Buller <k0wa at swbell.net>
Subject: [Amps] GS-35B Preparation
To: amps at contesting.com
Date: Thursday, August 19, 2010, 9:23 AM




Ok, I admit it....I am a Liberal Arts ham radio operator.  Now, that is not a 
"bad" thing, but I am not the brilliant engineering types I read on this list.  
Just leave it said...I am a frustrated engineering student who just could not 
grasp calculus (Algebra was "iffy" too, but I passed).

So....I have read the articles and notes on the internet about GS-35B prep.  I 
do not have the equipment or the means to properly prep the tube.  Is there 
anyone out there that does this?  Or, am I missing something here in my Liberal 
Arts mind that preparing the tube is easier than what is written?

Yes, I know the whole Liberal Arts thing is an excuse....

Lee - K0WA

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