[Amps] Alpha 77 Filaments

[Vic Rosenthal]

Harold B. Mandel wrote:

> In order to "beef up" the 160 meter performance of the Alpha 77SX
> amplifier a number of changes occurred in the upper and lower RF decks
> that are pertinent to the thread.

Why did isolating the heater improve performance on 160?  Or was it done to 
protect the tubes against a particular failuere...if so, what was the reasoning?

Not a challenge, just curious!

-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco