Hello From Maine

[Electronic M]

By about the mid 60's (64-66) most companies phased out tube circuits in their audio consoles (Zenith was a notable exception).

There was an awesome repair shop in near where I lived in Ill. whose owner was a pro vintage radio restorer, and sold many of his projects (which were always on display in the window). They would fix almost any vintage of electronic device one could find to bring them.