[Boatanchors] 813 grid to filament short

[Ron Youvan]

On 10/02/2015 11:22 AM, Dennis  W7QHO DuVall wrote:

> Yes, it would.
>
> On voice “asymmetry” what is typically observed is due primarily to distortion introduced in the speech amplifiers most hams use, not a natural feature of human vocalization.

   That is incorrect teaching.
   Flat bottoms in men's voices can be observed with a sensitive scope
directly from any microphone or loud speaker when men speak and very
very few women.  (negative peaks)

   As a broadcast engineer specializing in television for over
50 years I can tell you that I was instructed in this and how to keep
the polarity of the human voice properly oriented in 1960, and for
all forms of broadcasting.  AM, FM and TV, recall that an am station
can and do rebroadcast (even with a direct connection) FM and TV on
occasion.
In practice it is simple, keep the reds connected to the reds and
blacks connected to the blacks and be sure positive pressure on the
diaphragm caused a positive Voltage on the red wires.
Even with tube mic preamps the noise and distortions values were so low
that unavoidable microphonics in the tubes (new and good) caused more
of a reading than the generated noise or distortion.
We used HP noise and distortion measuring equipment exclusively.

   The artificial automatic voice asymmetry realigners (still in use)
are primarily useful when commercials (and other material) is obtained
from companies that hire people that think they know that they are
professional audio engineers.  (but aren't)
-- 
   Ron  KA4INM - Youvan's corollary:
                 Every action results in unwanted side effects.