[Milsurplus] More on the TCS Filter Adaptor

[David Stinson]

Thanks to everyone who contributed information and 
resources.  You're the best!

This adaptor is very impressive.  And simple.
I used the TCS set on the 160 meter contest last night
and had several successful QSOs that would have been
impossible through all that mess without it.
The manual and schematics of two versions of 
the adaptor are here:

http://home.netcom.com/~arc5/FilterAdaptor/

Question for Smart People:
The adaptor is great, but the stock assembly is too tall
(as you saw from the video) to fit inside the TCS.
I intend to build a more compact adaptor.

Are there any miniature, solder-in tubes that will 
replace the 6BA6 and 6AU6?  I know I could build
it using those tubes, but I always wanted an excuse
to use sub-minis somewhere.  
It could be done sand-state, but I'd have to 
"ham-mer" the wiring in the IF stages to insert 
it like that.  Would rather stick with this "tried 
and true" circuit, more or less.

TNX OM DE Dave AB5S