Old radio parts (3)

1920s Radio Components

A job lot bought recently

A pair of early T.C.C. bakelite-housed capacitors

These are 2uF and 1uF, 200vw probably designed for battery operated sets having an HT supply of around no more than 150 volts

The manufacturer was the Telegraph Condenser Company

but "TCC" sufficed as they were so well known

Early valve rectifiers

Philips 1561

An early rectifier in what is known as a balloon-shaped glass envelope

The anodes are matt black to assist in cooling

Rating: 4 volt 2Amp filament, 120 mA HT current and rated at 500-0-500V RMS

Mazda UU60/250

Another early rectifier both of a variety used in early mains powered radios. This has bright metal anodes containing a lot of metal and pre-date the blackening process of the other type shown above

Rating: 4 volt 1.25Amp filament, 60mA HT current and rated at 250-0-250V RMS

Other manufacturers made similarly coded valves and improved their ratings to get an edge on sales

A set of 3 very old resistors

These resistors are sealed in glass tubes presumably to give stability to the early resistive material

A set of 3 coils

These are Wearite types, carefully matched for three stages of a TRF or "straight" receiver

The cans are solid copper and the coils plug into standard B4 valve sockets

Below (left) is a view of one of the coils showing the matching copper baseplate

It was vital for a stable receiver that there was no unwanted coupling between the amplifying stages, hence the copper screening cans.

This coil is unscreened and could have been used in the RF stage of a small valve receiver.

The coil would have been mounted horizontally, as shown, on its two posts

John Gibson dropped me a line to say it's the LW/MW tuning coil from a 1932 Ultra Blue Fox radio which is a 2 valve plus rectifier set with a AC2/HL grid leak triode detector utilising reaction, transformer coupled to a AC/Pen output pentode.