[Amps] filament supply options

[jeff millar]

If Voltage across the filament caused bias/linearity/gain variation 
problems, then all amplifiers with AC on their filaments would have hum 
on the transmitted signal.
60 Hz on the filament varies very slowly compared to RF...its almost 
DC...so DC doesn't hurt...except for hypothetical wearout issues.

jeff, wa1hco

Steven Grant, W4IIV wrote:

>thanks for the tip...your correct...wouldnt using DC cause a bias condition that may cause linearity problems?.......steven
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