[ARC5] Smart People: Triode Connecting Pentodes

[David Stinson]

Thanks for everyone's input on this.
I have done the resistor-with-cap-bypass 
between screen and plate when I was working 
with the 1625s.  Not only does the bypass keep the screen 
at the same RF as the plate, but when removing the B+ 
from the screen to neutralize the PA, the cap is required, 
else the "floating" screen will change the interelectrode capacitance
I'm trying to neutralize.   I read of using the 7984s with direct 
connection of the screen to the plate (running these tubes at 
about 60% of maximum ratings) and have been trying that, 
but I'm with ya'll on this- it's killing the screens.  
Got to order some 5-watt resistors... more work to do
on this BC-375 project.

Want to hear what this 1928-design MOPA transmitter
can sound like on 7040 KC 40 meters 
when you get the keying relay "right," use a reasonable B+
and tame the "drift" problem?  Well... close to "tame."
Sorry for my poorly-adjusted Vibroplex.
It went from "yelping" like an old hound-dog treeing a coon
and wandering several KC away to something useable,
at least for Classic Exchange ;-):
http://home.netcom.com/~arc5/BC375/375-7040-211.mp3

Still more work to do.
73 DE Dave AB5S