"Dale J. " wrote in message ...
In article ,
Zoran Brlecic wrote:

How can it be safely assumed? You seem to be assuming too much of the
manufacturers. Their business is not humanitarian relief - they're in
this for the money. They would certainly not be the first one to make an
amp with the filament voltage too high.


73 .... WA7AA

Perhaps you're on to something. My AL80A was mfg by Prime Instruments
which made a fine amplifier, still with the original Eimac tube.

The vast majority of 3-500z amps have the filiment voltage set too
high from the factory. Probably 80% of them. Maybe more... most
henrys, including my 2k classic, TL-922's, SB-220's, most Ameritrons,
etc, all are guilty. You can stretch the tube life out a good bit if
you lower the voltage. MK