Hello all.
Seems murphy has struck yet AGAIN. This time long before the ARRL
international test.
I just recently purchased a new Svetlana 572B tube for my Heathkit
SB-200 amplifier. It seems as though this tube has a severe defect. I
have only used it for 2 months, and KAARAAACKKK!!!! ,.....exploded grid
resistor city.. The tube has developed an intermittant short from the
grid to filament.
According to what I have read, these tubes are supposed to be of
superior quality, but I have to wonder with a performance like this.
This is the SECOND tube to succomb to this problem. The first original
Cetron tube did the same thing. I can't see how this could be an
amplifier problem, as I don't see what could cause this fault, as I was
on just switching from TX to RX when it went BANG!
I'm a little leary of these tubes now, but will have it replaced under
warrantly non-the-less.
Has anyone else with an SB-200 or equivalent had the same experience
with tubes shorting from grid to filament?
I had thought Svetlana was going to be good but
nooowowwwwww.......hhhmmm.......
(damned those space heaters anyway!)
Regards,
Shawn
VE6PV
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