[Amps] Re GS-35B hours..

Doug Renwick ve5ra at sasktel.net
Fri Dec 18 19:50:24 PST 2009


And the max. legal output in VK is ... Ah what does it matter.

Doug

I'll run the race and I will never be the same again. 

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com]
On Behalf Of Robert Briggs
Sent: December 18, 2009 9:05 PM
To: amps at contesting.com
Subject: [Amps] Re GS-35B hours..

G'day all....I note the comment that 500 hours is probably the useful 
life for the GS-35B....I have two amplifiers which are turned on and run

daily.I use CW only, 160 meters..My original 35B amplifier was put on 
air in March 2006....That tube still runs perfectly...Say 300 days per 
year 3 hours switched on and running say 1 hour CW output that tube 
hasn't missed a beat....My newest GS-35B amplifier put on air last may 
2009 is also switched on for at least 3-4 hours a day and once more 
shows no sign of losing emission....I think either amplifier won't need 
a tube change for many years....

I don't run either tube hard, using 3500 volts on the original amplifier

and running it to 1100 watts output.It is capable of much more but why 
flog a willing horse...The newest amplifier has a deficient voltage 
doubling HT supply (AL-80B Transformer) and I run it to 1kw output 
CW....The GS-35B is a willing worker and with a robust power supply is 
quite capable of the US legal limit..I have found no vices with the 
tube...Best advice I have from my own experience is to make sure the 
tube is tuned and loaded properly both input and output and all is
sweet....

Bob..VK3ZL..


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