Tio Pedro wrote:
"ken scharf" wrote in message
. ..
Bob wrote:
I was thinking of using compactrons in the set, a single 6AR11 for the
85 khz IF, a 6D10 for the product detector and bfo, a 6AF11 for the AF
stage and S meter amp. A 6AG11 would serve as an AGC tube and AM
detector. The second (third?) mixer would be a 6BE6 (455-85), the first
and second mixers would be 7360's (expensive!). The first (xtal) hfo
would be solid state (maybe a pll), the second hfo (vfo) would also be
solid state. I have several nice three gang capacitors from ARC-5
receivers with dial gear drive that would work nicely. The completed set
would look more like the 2C because of the dial unless I ever find another
Edystone dial. (I had one in the junk box for a few years and sold it on
ebay to someone building an HBR. Got a kings ransom for it too).

The 6JH8 should work as well as the 7360 in a receiver mixer.
Swan changed to the 6JH8, probably for cost reasons.
( http://members.shaw.ca/pacifictv/cartridg.htm )

Not to make you feel bad, Ken... But, I still have an Eddystone
squirreled away for my HBR project. I think the Drake 2C
version makes more sense, though. The plug in coils and
oscillator LO scheme used by W6TC in the HBR
series leaves a bit to be desired.

Pete


Well the plug in coil stock used by W6TC are also unobtainium these days
too. It IS possible to by raw polystyrene tubing of the right size, and
glue onto bases from dead tubes, or tube base plugs (both of which are
available from time to time). The APC variable caps are getting rare
these days, but good quality ceramic trimmers would sub and these are
not TOO hard to find.

I have a bunch of turret tv tuners with the removable strips and also
gave thought to building a receiver similar to the HBR's but with toroid
core coils switched in the tuner strips. I don't know if the toroid
cores were available to W6TC and if he would have used them.

I also have a dial drive from an HRO receiver if I ever get the desire
to build something even more antedeluvian!