GR-78 opinions, anyone?

[Robert P. Okas]

Greetings,

    I'm restoring a GR-78 and have run into some things that lead me to
believe that the radio could be performing better. I'd like to know if my
unit is typical, or if there are some "issues" to address. When compared
to its older brother, the GC-1A, my GR-78 sounds distorted to the point
that I prefer listening to the GC-1A. Nothing severe, but signals sound
rather "fuzzy" and muffled. Does anyone else's radio sound similar?

    All of the voltages that I've measured are within 10% of what the
schematic indicates, so it is working, after a fashion. The speaker and
all other obvious things have been checked and verified. With moderate
signals, I've observed non-linearities in nearly every stage from the IF
strip down.

    I'd like to hear any thoughts, opinions or observations.

TIA,
Bob - W3CD

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