About,
"I've got the source of much trouble here in my hand... a 3-500z with a
cathode to grid short. Anyone care to suggest a method to possibly open
the short. I won't trust the tube in an amplifier again, except maybe a
construction place holder."
Yes,
I have heard you can blast out the short by connecting fil to grid
momentarily to a car battery. Or, better still, momentarily in series
with say, a small heating element like a 1 KW toaster and the 120 VAC
power line. Wear goggles just in case.
Especially for non-critical use like CW, the small hole in the grid
won't hurt linearity much.
Please let us know results!
73, Roy K6XK
--
FAQ on WWW: http://www.contesting.com/ampsfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|