wrote in message
...
On Mon, 06 Feb 2017 21:54:54 -0800, Spare Change
wrote:
On Feb 2, 2017, wrote
(in ):
Why should someone replace ALL the capacitors on old Tube equipment?
https://en.wikipedia.org/wiki/Glowing_plate#Common_Occurrences
Several causes listed are caused by shorted or leaking capacitors. It's a
tube killer.
A;so the sinle largest killer of hard to replace power transformers.
Not to mention a leaky grid coupling cap can pass a large DC voltage from
the plate of the previous stage. I've seen tubes that got so hot the glass
melted and the vacuum wrapped it round the internal structure like cling
film.
If it happens in Ham gear - the PA tubes are seriously expensive.