Back in the mid 90s I talked to a guy in Pauls Valley, OK who had an FT
101E. He had made modifications to his for better audio, but I don't know
if they mirror what you saw. Recently another friend in Amarillo, TX
bought another transmitter and sold FT 101E. It also sounded very good on
the air.
I agree with Paul, they can sound very good with minor changes.
There is an article in The AM Press/Exchange (don't recall which issue),
written by Tim, WA1HLR, on converting the FT-101 series to hi-fi audio, both
on transmit and receive.
I modified a couple for friends, and it worked well.
Don k4kyv