[Milsurplus] BC-9: NETTED! WoooHOOO!

[David Stinson]

You know, I am grateful to The Almighty for 
getting me in touch with such a grand community
of  sharp people who are generous of spirit.

The BC-9 is Netted!  WooHoo!
The solution was indeed to insert a *real*
RF Choke in the DC shunt feed to the Osc.
Plate.  C6 is no longer needed (nor has
any effect) and the external RF chokes 
on the 120VDC line are eliminated.  
Here's the revised diagram:
https://goo.gl/photos/y6mJsdF9RrYDZzJN9
All you folks working on replicas, take note.

I'm still impressed with how stable this rig
is and how little chirp.  Of course, the DC/DC
converters provide excellent voltage regulation
at such low load levels.

The receiver and transmitter net to within
just a couple of  hundred cycles from one
end of the band to the other.  And this 
is consistant across tube types.
I tested 01A, Triode-connnected 6AQ5
and VT-25A.  All behaved similarlly.
Note that, with the loop, the 6AQ5 is
not the best tube.  It does something 
at high bias levels that causes the audio
amps to motor-boat.  Don't know what.
The VT-25A is the best for both TX and RX.
And that's with only 6.5 V on the filament
of a 7.5V tube.  Tight fit but it goes.
Figures; Can't get a $600 tube, so
the best one is just $125, LOL.

I will be tinkering with the rig on the big
copper loop tonight around 3555 KC +/-.
If you hear a little signal with a little
wobble, let me know, HI.
Discovered that the radio might even work
on 40 meters.  Already pushed it to 6 MC
and it worked.  Another time.

Gentleman, I lift my soldering iron and
doff my hat to every one of you who 
contributed thoughts and suggestions.
You are the very best.

GL OM ES 73 DE Dave AB5S