RT28 1:28 Ratio, suits RCA Varacoustic, 77, Beyer M130, M500, M260, M360, and other mics with narrow ribbons re-ribboned with 1.8 micron foil.
Samar's low losses, low distortion, and extremely low DCR ribbon microphone transformers are wound on annealed Amorphous tape wound cores impregnated in a metal can. The typical primary DCR is only 0.002 Ohm and secondary DCR between 3 and 10 Ohm, depending on ratio.
