Tech-Master FM-50 30 Watt Tuner Tube Identification For Parts and Repair No Audio

Restoration Item Tube FM-50 Tech-Master Japanese Radio for Parts and Repair.
tech-master model 50
FM Tuner
Frequency Modulation
Frequency Modulation (FM) is the encoding of information in a carrier wave by changing the instantaneous frequency of the wave. FM technology is widely used in the fields of computing, telecommunications, and signal processing.
Tubes in the unit:
RCA 12AL5 Dual or Double Diode
RCA 12AU6 Pentode, Sharp Cut-off
RCA 12AU6 Pentode, Sharp Cut-off
RCA 1264
RCA 6U8A Triode pentode constructed as a beam tetrode.
RCA 6BN8 Miniature, high mu triode
RCA 12DT8 Dual Triode, rf amplifier and as a combined oscillator-mixer in fm tuners.
Mu. Mu is useful in determining the gain of a particular stage of an amplifier.