©
2008 www.valve-radio.co.uk
Edison
Swan Electric Co. Ltd (Ediswan)
Resistance Coupling Unit
This unit consists of two resistances and a coupling capacitor and provided a compact way to couple one valve stage to the next. They were used in the Ediswan RC Threesome home constructor set and the construction booklet includes a description of this unit - it can be downloaded from the Radio Literature section of this site - click here
Each resistance is in a glass enclosure and the Ediswan name is stamped on the end caps. The remains of the paper labels read "Anode" and "Grid". The coupling capacitor is made of mica and is sandwiched between two ebonite base plates and connects the grid ("G") terminal and the anode ("P") terminal.
The RC unit cost 7 shillings in 1927.
