Re: [Amps] SB220 running plate current when no drive; Problem found

[Rob Atkinson <ranchorobbo@gmail.com>]

3-500s may still be in production but the cost is high compared to
years ago and quality may be questionable.

Good tubes in ham service should last for decades.  There are SB220s
out there with the original Emacs going strong.

A tube failure is due to one or more of the following:  Poorly made
tube, improper operation, or poor amplifier design.

Ameritron has a single 3-500 amplifier they advertise as a 1 KW output
amp.  Anyone who drives that single tube to that level all the time
will have to get a new 3-500 every few years.

73
Rob
K5UJ
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