Amps,
I had a poof event on my Henry 4K-U. Appears the tube went south... no
power out. I opened the amp and checked for any signs of failure or damage.
Found none. Replaced the tube with a 8877 pull of unknown quality. Fired
up the amp and it appeared to operate correctly ... power output, loading,
etc. On the air reports said it had no abnormal sounds... no distortion,
sounded good at 1400 watts output. However, the grid current was reading
too high. Checked the calibration of the grid current meter per the
directions in the manual... grid meter was indicating correctly.
Any recommendations on what to check next? If the tube is good, I don't
want to damage it.
Could a bad tube exhibit abnormally high grid current?
Bob
K8MLM
Woodbridge, VA
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