The same thing can happen with the Hallicrafters HT-44. Luckily, I have added
a plate current meter to both of my Halli PS-150-120 power supplies, so I can
monitor the plate current. (For some unfathomable reason, Halli decided not to
put in a plate current meter on the PS-150-120, necessitating user mods if one
wants one!) The cinch connector only did this once in the past 30 years, and I
caught it within 5 seconds, cutting the power. Amazingly, no damage to the
finals!
I know this is off topic re Drake, but thought I would mention that this same
risk applies to other tube gear.
Howard VE3AXD
Robert Ladden <[EMAIL PROTECTED]> a écrit :
Robert Ladden made an utterance to the drakelist gang
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Did you know that if the cinch connector becomes loose on the back of
a T-4XC, the bias may become disconnected but the plate voltage can
remain? I learned that the hard way. The plates don't just glow red,
they become bright orange very quickly. When I saw that I hit the
switch on the power strip, not knowing what the problem was yet.
After that, the T-4XC would only put out about half power (which is
better than expected). Fortunately, I had a spare set of 6JB6's and
was back on the air with full power quickly. The frustrating part is
that I did the AC-4R upgrade to prevent such a problem. The lesson is
to check the cinch connector frequently.
73,
Bob WW3QB
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