Antique radios, Old Time Radios
PF-HC-3F
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Country:
Great Britain (UK)
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| Identical to |
PF-HC-3F
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| Base |
Swan-Bajonett B22=22 mm
Wires only.
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| Was used by |
Transmittertube (Radio) |
| Filament |
Direct |
| Description |
This tube was designed by H. J. Round and made by Ediswan for the Marconi Wireless Telegraph Co Ltd (GB). Most transmitting types had three filaments of lime coated platinum wire, with the provision fo use them singly, if required. Some valves had 4 contacts. in the base sheathing. These bases were usually nickel plated brass. Properly used, these valves achieved amazing sensitivity and performance.
Some valves had a tubulation on the top mwhich contained amalgam instead of the usual asbestos. This was a method of adjusting the vacuum
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| Information source |
Saga of the Vacuum Tube, Tyne p. 209 - 212
-- Collector info (Sammler) National Valve Museum UK
-- Collector info (Sammler)
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Just Qvigstad
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