Hi Folks:
I found this radio at a flea-market and had to buy it. Just $2.
It works anyway.
I put it on a IFR (spectrum analyzer) and it's damn spurious,
especially on one of the sidebands! I shut-it-up a bit with tuning,
and I guess it's down about -40dB of fundimental, but I think it could
be cleaner. AM is clean (better than 50 dB down) but it was touchy to
get it clean. At least the 11.275MHz doubler circuit is very
spurious. I just ordered schematics from Kens Electronics.
I like this old radio. The controls feel very smooth. I have the
crystals about as close to where they need to be, but most of the
crystals are too low. I read on the net that the 4-crystal bank needs
to be tuned 3kc higher than marked. Only one of the four went that
high. I think I can get close to channel-center with the clarifier on
the other bank. The PCB containing the crystals seems to have been
worked on with cut traces and jumpers. I'm thinking someone either
tried to slide it or this is a factory mod. That leads me to thinking
what the difference is between the 674A and 674B.
If anyone has any experience/hints to this radio they'd like to
share, I'd much appreciate it!
Thanks!
Harry