Other radios based on the same chassis:
First of two tiny 2-valve mantle radios from HMV, with 4-valve performance using muti-purpose valves.
Released with a cardboard dial showing only the big 4 stations 1YA, 2YA, 3YA and 4YA. The dial was also marked with either the 'HMV' brand or 'Magic Tone' and a music note for a logo (the MK2 version was also released under both brands but had a glass dial).
Most likely released in 1941, the first information seen in print is from Mason, Struthers, and Co Ltd in Christchurch announcing the 'Midget HMV Radio'
The Press - 2 Dec 1941
Wisemans of Auckland early advertising for this model showed it as the 'HMV Twin 4' most likely referring to the two dual-purpose valves it used, but their later graphic ads for the MK2 version showed the Midget name as well.
Auckland Star 10 January 1942
This model had a cardboard dial and unusual grill design. In the rear or the radio the main transformer, located roughly in the middle of the chassis, stood upright, while in later models it lay flat. Early chassis' are also said to have been spray painted while later models had nickel plating.
Valves (2): 12B8GT, 25A7G or GT
Intermediate Frequency: TRF
Frequency Bands: 1
Chassis Notes(most schematics can be clicked to download a full size version)
TRF chassis using a 12B8 triode / pentode for RF and a 25A7 half-wave rectifier / beam powered tetrode. Rola F4B speaker.
Take care with the transformer, it has a 225V HT winding and a 37V heater winding which would need rewound if damaged since nothing like that will exist off the shelf today - certainly not in a package that will fit this radio.
|1941||HMV Midget 'MK2'|