4-Valve Screen Grid Portable B4 Second cabinet design
- Royaume Uni
- Fabricant / Marque
- Murphy Radio Ltd.; Welwyn Garden City
- Radio - ou tuner d'après la guerre 1939-45
- Radiomuseum.org ID
Cliquez sur la vignette du schéma pour le demander en tant que document gratuit.
- No. de tubes
- Principe général
- Récepteur TRF - par réaction (régénératif); 2 Etage(s) BF; Tube à grille écran 1926-1935.
- Circuits accordés
- 1 Circuits MA (AM)
- Gammes d'ondes
- PO et GO
- Tension / type courant
- Piles (rechargeables ou/et sèches)
- HP mais de technologie inconnue
- Boitier en bois
- De Radiomuseum.org
- Modèle: 4-Valve Screen Grid Portable B4 Second cabinet design - Murphy Radio Ltd.; Welwyn
- Portative > 20 cm (sans nécessité secteur)
- Dimensions (LHP)
- 15 x 17 x 9 inch / 381 x 432 x 229 mm
4-Valve Screen Grid Portable
- Single Tuning Control
- Completely Ganged Circuits Calibrated in Wavelengths
- Fitted in beautiful Walnut Cabinet
- No aerial or earth is required.
- B.R.V.M.A. Valves.
- 2 -volt, 23 AH Accumulator, mounted on an acid-proof rack.
- 108-volt HT Battery, 12 mA. rating. Average HT consumption, 8-9 mA.
- Gramophone Jack.
- External Loudspeaker Jack.
- External aerial and earth sockets.
The circuit comprises a single-screen grid stage of HF amplification, reacting leaky grid detector, and two transformer-coupled LF stages.
Excellent loudspeaker reproduction, giving very enjoyable music and particularly clear speech.
Range and selectivity are equal to, if not better than, any other portable set on the market.
The cabinet was redesigned in early 1932. No alterations were made to the chassis. See B4 first cabinet design.
Polished Walnut cabinet by R.D. Russell.
- Prix de mise sur le marché
- 17.85 GB £
- Radio! Radio!
- Wireless Magazine (April 20, 1932, Page 412)
- Modèle crée par Konrad Birkner † 12.08.2014. Voir les propositions de modification pour les contributeurs supplémentaires.
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THE 1932 MURPHY PORTABLE.
Original Chassis to be Continued in a Redesigned Cabinet
When first introduced nearly two years ago the Murphy type B4 receiver at once established for itself a position in the front rank of portable sets of the better class. The performance in the matter of range and selectivity was exceptionally good, and the arrangement of the controls on the top of the cabinet with a ledge upon which to rest the hands when tuning was an idea that earned universal approval.
We are glad to note that this feature is retained in the 1932 edition of the B4 portable.
The only alteration to the cabinet takes the form of a new loudspeaker grille of bold and original design. No alterations have been made to the chassis, as the original screen grid H.F. - detector - 2 L.F. circuit gives a performance that is still more than adequate for present-day reception conditions. It is a tribute to the intrinsic soundness of the design that this performance is being repeated consistently in current sets. This was proved by a recent test on a receiver drawn from stock. Upwards of twenty-five reliable programs were available on the lower waveband after dark, while four or five mediumwave stations, including Brussels, Hilversum, and Langenburg, came through well in daylight. The efficiency on long waves is equally good, and the selectivity on both wave- ranges is exceptionally good, even for a set employing a frame aerial. The price of the Murphy portable in its latest form is fifteen guineas
Wireless world April 20, 1932, page 412
Gary Cowans, 27.Feb.22