[Amps] 8877 Longetivity

[Nelson Wittstock]

FWIW I am using an 8877 in my amp that I built back in 1977. It is still the
original tube.  My filament transformer is run off a Variac and I have a
panel meter to monitor and see that it is five volts.  I also have a timer
interlock so that the HV cannot be turned on until the tube has had three
minutes to warm up.  When I shut down I run the Variac back down to zero and
leave the blower on for a few minutes for cool down.  The amp was built from
a QST article in the September 1971 issue.  It has seen a lot if use.  I
added 160 meters to it and it has served me well.

Nelson, K8DJC