RCA45 single-ended amplifier

45 (245) is a direct-heating triode, first introduced by RCA in 1928, and widely used for radios and record players. Later, the shape of the tube changed to ST type as shown in this movie.
Driver: 5687 (twin triodes)
Rectifier: RCA80
Power transformer: Noguchi PM-140HG
Output transformers: Noguchi FM-3WS (fine-met core)
Loud speakers: Isophon oval front-magnet full-range unit