Originally made with a 55 mm diameter bulb. Some BTH R tubes have been found with a vertical element assembly. later tubes c. 1922-25 had tapered bulbs approx. 40 mm diametera<100
Dimensioni (LxAxP) incl.pins/tip
x 118 x 55 mm / x 4.65 x 2.17 inch
Quotazioni
1 Quotazioni (visibili solo per gli
associati)
Bibliografia
- - Manufacturers Literature 1925 Brown Brothers Catalog 217
Saga of the Vacuum Tube, Tyne Pages 217-219
R_BTH: KoBi
Konrad Birkner † 12.08.2014
Just Qvigstad
R_BTH: Banneitz, TB der drahtl. Teleph. 1927
Anonimo 15 Collezionista
