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370

370; His Master's Voice (ID = 1372981) Radio
 
370; His Master's Voice (ID = 1372982) Radio
370; His Master's Voice (ID = 1376434) Radio 370; His Master's Voice (ID = 1656335) Radio
370; His Master's Voice (ID = 1372934) Radio 370; His Master's Voice (ID = 1459448) Radio
370; His Master's Voice (ID = 1459450) Radio 370; His Master's Voice (ID = 1459451) Radio
370; His Master's Voice (ID = 1459452) Radio 370; His Master's Voice (ID = 1459453) Radio
370; His Master's Voice (ID = 1515461) Radio 370; His Master's Voice (ID = 1376435) Radio
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370; His Master's Voice (ID = 1376434) Radio
His Master's Voice: 370 [Radio] ID = 1376434 933x1380
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For model 370, His Master's Voice (Masters, HMV, H.M.V., Marconi); Hayes, Middlesex, GB
 
País:  Gran Bretaña (GB)
Fabricante / Marca:  His Master's Voice (Masters, HMV, H.M.V., Marconi); Hayes, Middlesex, GB
Año: 1935 Categoría: Radio - o Sintonizador pasado WW2
Válvulas 4: VMS4B MH41 N41 U12
Principio principal RFS (Radio Frecuencia Sintonizada) en general
Gama de ondas OM y OL
Especialidades Tocadiscos-autom o no-no sabemos
Tensión de funcionamiento Red: Corriente alterna (CA, Inglés = AC) / 200-250 Volt
Altavoz Altavoz electrodinámico (bobina de campo)
Potencia de salida
de Radiomuseum.org Modelo: 370 - His Master's Voice Masters,
Material Madera
Anotaciones

Similar to the Marconiphone 245 radiogram.

The scale is translucent with the tuning pointer behind it. A lamp is mounted behind the pointer travelling with it to cast a shadow on the scale.

The record player pickup uses steel needles. Its speed is adjustable and there is an auto-stop mechanism.

Access to the Radio Chassis is by removal of the top record player assembly.

Documentación / Esquemas (1) Trader sheet 687

Modelo creado por Howard Craven. Ver en "Modificar Ficha" los participantes posteriores.



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Contribuciones en el Foro acerca de este modelo
His Master's Voice: 370
Hilos: 2 | Mensajes: 2
Entradas: 976     Réplicas: 0
hismasters: 370, Moving Iron pickup
Michael Watterson
16.May.14
  1

The needle holder is the "moving iron" as I can confirm it plays with a Bamboo "needle".

 
Entradas: 953     Réplicas: 0
hismasters: 370: Gram / PU wiring
Michael Watterson
15.May.14
  1

The radio doesn't use a true volume control. Instead the "volume" control potentiometer (on right) is V1 bias (quite common on late 1920s & early 1930s) and to an extent the "reaction control" capacitor (on left).

The chassis was modified for Gramophone use by adding three wander sockets (pair nearest side of chassis are both "earth" and 3rd is signal) and 1 M Ohm pot ganged with R5 (14 K Ohm) the V1 Bias / "volume". Extra switch contacts are supposed to be used to connect the silder of the extra 1M  Pot fed by 3rd wander plug socket and disconnect C10 from V2 detector. Except on my model the Radio "muting" is very poor (on the 370A and related models they also short V2 anode to HT to provide more Radio muting!) and the ganged pot is missing.

The turntable panel was hacked on rear (long ago, perhaps even in 1930s or 1940s) to add a 1M volume control there. The input socket appears to be aways connected to junction of R12 & R11 as turning the "deck" volume down controls radio volume!

Perhaps the solution is to buy both 20K and 1M stereo pots and swap the backs to have a 1M & 20K (close enough to 14K as it's open one end) dual gang and examine switch wiring. Then fill hole in top panel. The pick up is "floating" pair with an overall screen. The 3 sockets on chassis rear is common earth for screen and one signal wire.

The moving iron Pickup coil  uses unbelievably fine wire, with about 42500 Ohms (42K5!) on about a 15mm bobbin about 5mm tall winding.

See photos of arm and pickup assembly and sockets under chassis (top left of image sockets, left side of image is rear)

 
His Master's Voice: 370
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