[HBR] HBR -- Part 8

[Hopperdhh at aol.com]

Walt,
 
I know that some receivers reduce the filament voltage on just the detector  
with a series resistor.  One example is the Hallicrafters SX-100 which  uses 
two 6.8 ohm resistor in parallel for the 6BJ7 triple diode.   Also, the Knight 
R-100 used a 3.3 ohm resistor to the triple diode  6BC7.  I wonder if this may 
have been for the benefit of the noise limiter  section because the Drake 2-B 
used an 8BN8 for the noise limiter and first audio  amp powered from 6.3 
volts.  I always wondered what benefit that  the lower filament voltage gave.  
Maybe you can shed a little more  light on the subject.
 
Thanks,
 
Dan
 
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