[Milsurplus] TCS Receiver: Homebrewed Mech Filter Adaptor.

[David Stinson]

Well I dug around in "the Cave" and found an old Collins 
mechanical filter I've had in the piles from probably 25 years. 
I *thought* it was 455 KC 100 cycle (too narrow for this 
application) but it turned-out to be a 2.1 KC LSB filter.  Just 
what I needed.  So I perf-boarded one of the adaptors small 
enough to allow me to put the receiver cover back on.  Again, 
6026 subminiture triodes and here's the diagram:

http://home.netcom.com/~arc5/TCS/TCSFilterAdaptor1.jpg

Here's how my cobbled-together effort looks:

https://goo.gl/photos/hxCVFbPsbZEMZJDQ6

I wire-wrapped the tubes in; how cool is that?

With the BFO zeroed, nice LSB audio.
AM sounds OK, like you'd expect listening with a Drake TR-4 or 
so.  With the BFO 1 KC low, Nice CW QSOs.  Only trouble is on 
very strong signals,  I get some ringing feedback, probably 
because the tubes need to be shielded from each other.  I'll fix 
that later.  Buttoned it up and I'm ready for Novice Rig Roundup! 
When a project goes this well, I like to play this tune:
http://home.netcom.com/~arc5/TCS/happyboy.mp3

73 DE Dave AB5S