Output Transformer S.2/0

• Brand: Birmingham Sound Reproducers

Output transformer, type S.2/0

The output transformer tested appears in their catalogue as model S.2/0. and has a step-down ratio of 15:1. This model is available in various other ratios, extending from 40:1 to 1:1, and special models can be made to order.
Owing to the generous size of the core and the provision of a small air gap in the magnetic circuit, anode currents up to 120 mA. (D.C.) can be passed through the primary winding. Thus there is no need to employ choke coupling, and the transformer may be connected directly to the anode circuit of the output valve.

The measured inductance of the primary winding is 10.7 henrys without D.C. flowing, and 8 henrys with 120 mA. passing, the change in inductance being sensibly linear between these two limits. Since this model will be used generally with super-power output valves whose A.C. resistance is less than, or of the order of, 1,500 ohms, the inductance of the primary is more than sufficient to assure that perfectly satisfactory results will be obtained.
The price of the output transformer 25s.

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Tous les appareils de BSR (Brand), Birmingham Sound Reproducers Ltd.; Staffordshire