Mains Transformer H.8

• Brand: Birmingham Sound Reproducers

Mains transformer, type H.8.

This mains transformer is designed for use with the Westinghouse HT.8 rectifier. The coils are wound on molded bakelite formers, and the insulation throughout is of an exceedingly high order: an important matter in mains transformers. On test the model H.8 was found to give exceptionally good regulation, the A.C. output from the secondary winding varying by a small amount of 3.5 percent. between a load of a few milliamps. and the maximum of 60 mA.

The D.C. regulation curve on the graph is thus virtually the regulation of the rectifier alone. All measurements were made with the single 4-volt winding loaded by a resistance passing 3 amps. Its maximum output is given as 4 amps. This winding gave exactly 4 volts with no load on the HT circuit, and 3.93 volts with the rectifier fully loaded: a very satisfactory performative indeed.

The price of the mains transformer described above is 27s. 6d. with one 4-volt L.T. winding or 25s. without this addition.

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