The mentioned 4-125 was always white and I never had to change the tube.
It sat in a modified HT41 chassis.
Later I added a second tube and returned the anode voltage from 4KV to 2KV,
switched back from bridge rectifier to two-way rectification.
That was in 1977, since then that amp is still in use at a club station with
the same tortured tube and its sister loafing at 800W out.
73
Peter
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Carl
At 1500 out a 4-400 key down is almost yellow, I tried one at 5KV once which
was enough.I cant imagine any surviving long that way.
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