Crosley Radio Model 56 TU (O)

Circa 1947

This is the type of small radio that would have been popular as a kitchen radio in the time it was new.

Above, The ivory painted Bakelite cabinet is in untouched original condition. When I initially saw this set in a local antique shop, I thought the clear handle was a later addition by a previous owner, and had passed on it the first few times I saw it in the shop. Flipping through and seeing pictures in the Rider's manual, however, confirmed that the ivory versions of this radio had the handle, the unpainted brown version does not. So, the next time I was in the shop, I picked it up.  This is a nice post-war style radio, but you'll note an unusual feature: the dial is backwards from the common arrangement of low to high going left to right.

Below, the labels pasted under the cabinet. The (O) designation signifies octal tubes, the 56 TU uses loctal tubes.


Above, and below, before and after views of the chassis. This radio played as purchased, but I was unsure what the condition of the electronics was. You can see that the two .022mF capacitors under the 50L6 tube (bottom left corner of chassis) appear to have been overheated, by the way that wax end seals have popped out. One of these is the audio coupling cap from the first audio to the output, the other is for fixed tone compensation. The new electrolytic capacitors explain why there was no power supply hum.

Since I wanted to use this set, I went ahead and replaced the six paper capacitors. This was a relatively straight-forward set to work on, and the work was made easier by the fact that the leads were only loosely wrapped around the terminals. The hardest part was the capacitor from the B- to chassis, because the chassis end lead connects under the oscillator coil.

Tube line-up:

ID Type Function
V1 12SA7-GT Converter-Oscillator
V2 12SK7-GT Intermediate Frequency Amplifier
V3 12SQ7-GT Detector-AVC-Audio Amplifier
V4 50L6-GT Beam Power Audio Output
V5 35Z5-GT Rectifier

Service Data:

Riders Volume 17, Crosley Page 17-7, and 17-8. (56TU)

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