I have an unusual situation underway in my L4B. Evan, you out
there? Been working fine until yesterday (i know, well happy new
year) one of the 3-400's filaments is half as bright as the other. I
reversed the tubes and the same tube was dimmer in the opposite
"hole", and the amp and supply seems like they're running hotter
than normal. HV is normal, but haven't keyed it yet or applied
drive. Pwr supply was rebuilt a couple years ago with one of Mike's
boards. Has anyone seen a tube fail like this? Being a week after
xmas and the YL's birthday Friday, not real anxious to spend 5 big
ones on a pair of 3-500's right now, but a guys gotta do what a guys
gotta do.
2nd question. I've got one 3-500 spare that I believe to be good. Has
anyone ever mixed a 3-400 and a 3-500 in the same amp? Only for
testing purposes. Just asking.
Rick
W9WS
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