Straydog wrote:

SNIPPED


Here is another item to look for: the old style first "printed
circuits". What they did was mold a network of resistors and capacitors
into a molded "chip" and it hangs there, suspended in mid-air, and they
don't make those any more. I had an HQ-170 that had one of those and you
could not find out what was in that network because the manual just
showed it as a box with leads coming out. If it goes bad, then you would
have to guess what was in it. Examine the manual to see if there is a
"black box" square in the schematic that does not tell you what is
inside. So, if it craps out, you might be up the creek.


SNIPPED

The HQ-145 I just finished refurbishing has two of those circuits in it. One is
the AVC/AGC network; the other is interstage coupling for the audio output.

The schematics for both are shown within the field of the basic receiver schematic.

The schematic for the HQ-180 at the BAMA site shows the parameters inside the
hybrid.

/s/ DD, W1MCE