Filament Transformer

Ellison Filament Transformer

There are probably many readers who have A.C. mains but whose sets use battery valves with an A.C. eliminator and wish to change to the more efficient A.C. valves. The necessary modification to the set can usually be carried out easily, but a filament transformer will be needed.

The transformer is well-made and has a very substantial core and a neat terminal assembly on the top. Only two windings are provided, the primary tapped for voltages between 200 and 250, and a centre-tapped secondary winding giving 4 volts on load.

On test, the transformer was quite satisfactory, with good regulation, as can be seen from the accompanying figures. The no-load power was 1.7 watts, giving an efficiency at full load of 93 percent. 

In questo link sono elencati 2 modelli, di cui 2 con immagini e 0 con schemi.
Elenco delle radio e altri apparecchi della Ellison Manufacturing Co., Ltd.; Harrogate