Audimax 3 by CBS Labs at 1965 all tubes.
3-411 by CBS Labs at about 1967 all transistorized.
Volumax 4450A and Audimax 4010
by CBS Labs at 1970 all transistorized.
you see schematics of Audimax.
you see schematics of Volumax.
2BA or 146A2 peak limiter at about 1970 all transistorized.
plug-in modules BA-46 Limiter and BA-45 AGC
at about 1970, transistorized.
1 from brand Marti good Quality STLís.
Seems to be all tubes? At about 1969?