[AMPS] blown grid wires

[John T. M. Lyles]

A significant failure mode of some gridded vacuum tubes is cathode 
damage from ion bombardment during discharges. Another indication is 
holes in the grid from the pass thru energy. I have a photo of a 7835 
grounded grid triode, under autopsy, showing a quarter inch hole in 
the wound grid. Down the hall at work, someone has a planar triode 
that was working, although a large percentage of the grid (very 
fragile thing) has holes.

If anyone wishes to see the photo, I can ship the JPEG of the photo, 
about 100 K in size.

73
John
K5PRO

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