HiFi Receiver

• Brand: Birmingham Sound Reproducers

Birmingham Sound Reproducers, Ltd. has introduced a new high-fidelity receiver with advanced features. The receiver, priced at 85 guineas, offers a flat audio response from 40 to 12,000 cycles per second and includes an automatic record changer with a piezo-electric phonograph pick-up.
The system employs two loudspeakers: a moving coil type and a high-frequency unit.

Key features of the receiver include:

1. Adjustable selectivity: A continuous control varies the coupling between band-pass coils in six IF tuned circuits, allowing the received band to be adjusted from 24 kc (for 12,000-cycle audio response) to hair-width selectivity.
2. "Whistle filter": Set at 9 kc, this filter reduces interstation interference between European broadcasting stations. It is automatically bypassed when the receiver is set for reception above 9,000 cycles per second.
3. Visual tuning, delayed a.v.c., and inter-carrier noise suppression.
4. Adjustable noise suppression: A separate control allows continuous adjustment of receiver sensitivity from its maximum (one microvolt) to a level suitable for the strongest signals.
5. Resistance-capacity coupling in audio stages, with the final stage delivering six watts to the speaker.
6. Dual European wavebands: 190 to 570 metres and 800 to 2,000 metres.
7. Eight tubes, including the rectifier.

The selectivity control integrates multiple functions, including the whistle filter and high-frequency speaker activation, all managed through a single knob.
This innovative British receiver combines advanced audio technology with user-friendly controls, offering a high-quality listening experience across various reception conditions.

Here you find 105 models, 97 with images and 21 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from BSR (Brand), Birmingham Sound Reproducers Ltd.; Staffordshire