Hello Stephen,

pls use the button "man. Date" on the left.

Note: there were 2 circuit versions:
TLM170, violet logo, 1983-1993
TLM170R, red logo, 1993-today

The R stands for remote pattern control, when using a N248 (or older N48R-2) supply. In other respects, the versions don't differ.

Best regards,
Martin Schneider / Neumann Mic. Development