[HBR] HR-10 to HBR project

[Walt Hutchens]

The current lineup is:

6EH7   -- RF
12AT7  -- 'semi balanced' mixer
6BH6   -- ECO local oscillator
6EH7   -- 1st IF
6EH7   -- 2nd IF
12AX7  -- 'semi balanced' product detector
6AM8   -- diode AGC bias rectifier/pentode BFO
6LF8     -- triode 1st AF/pentode 2nd AF
6JW8   -- triode AGC plate detector/pentode 100 kcs calibrator
6X4      -- rectifier

The HR-10 was originally a 7-tube receiver so three extra 9 pin socket holes
are required.   All the old 7 pin tubes become 9 pin, one of the 9's becomes
a 7.   Two new octal sockets are required for the antenna and mixer coils.
The oscillator coil replaces the plug in crystal calibrator.

The chassis is plenty large enough.   There really are no areas of serious
congestion. 

It's still a work in progress but I think this is the other side of the hump
with just refinements left to do.

Walt
KJ4KV