FOR OLD TAPE RECORDERS NEED A VU METER
if you want to make record for other tape or source
this VU meter need for using from ONE source to 2 tape recorder in samme time.
I had built for my Telefunken M5 & Stder C36, B62 Reel to Reel units
600 Ohm Balanced XLR circuit with Transfomers
it is a Great "toy" for a home or a small studio
makes record or mix music