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..
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|