55
Early Wireless Set - Sloping Panel Radio c1920. Custom wooden case with rear access door. De
Early Wireless Set - Sloping Panel Radio c1920. Custom wooden case with rear access door. De Forest Swinging Coils. Mullard Valves, possible replacements dating c1930. The horn speaker is a Sterling ‘Baby’ c1925. Headphones are BTH British Thomson-Houston Co Ltd c1925. 2 x Siemens Brothers Co Dry Cell Batteries size BS. The radio is untested. There are some dents and scuffs to the horn. Wooden case door is warping. Generally, good condition. Case is 40.5cm high *Technical notes* Swinging coils made for bright emitter valve - filament rheostats. Requires an accumulator (2V) to run the valve heaters, a 90V - 120 v battery to provide the HT and a grid bias battery which is used to negatively bias the grids of the valves to their correct operating condition. The grid bias battery is generally tapped to provide any voltage in 1½ volt steps up to -9V.
Early Wireless Set - Sloping Panel Radio c1920. Custom wooden case with rear access door. De Forest Swinging Coils. Mullard Valves, possible replacements dating c1930. The horn speaker is a Sterling ‘Baby’ c1925. Headphones are BTH British Thomson-Houston Co Ltd c1925. 2 x Siemens Brothers Co Dry Cell Batteries size BS. The radio is untested. There are some dents and scuffs to the horn. Wooden case door is warping. Generally, good condition. Case is 40.5cm high *Technical notes* Swinging coils made for bright emitter valve - filament rheostats. Requires an accumulator (2V) to run the valve heaters, a 90V - 120 v battery to provide the HT and a grid bias battery which is used to negatively bias the grids of the valves to their correct operating condition. The grid bias battery is generally tapped to provide any voltage in 1½ volt steps up to -9V.
Chinese, Indian & Asian Art - Mint & Used Stamps - Early Wireless Radio - Silver & Gold
Sale Date(s)
Venue Address
We offer packing and posting as part of our service
Important Information
.We are a customer focused business, giving value to buyers and sellers
Terms & Conditions
25% Buyers premium which includes Vat. Please see our website for full details