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The B7G (or "small-button" or "heptal") seven-pin miniature tubes are smaller than Noval, with seven pins arranged at 45-degree spacing in a 9.53 mm (3/8th inch) diameter arc, the "missing" pin position being used to position the tube in its socket (unlike octal, loctal and rimlock sockets). Examples include the 6AQ5/EL90 and 6BE6/EK90.
110–119 – Y8A 8-pin steel tube base; Rimlock B8A; 130–139 – Octal; 150–159 – German 10-pin with spigot; 10-pin glass with one big pin; Octal; 160–169 – Inline wire-ended Pencil tubes; Y8A 8-pin steel tube base; 170–179 – RFT 8-pin; RFT 11-pin all-glass gnome tube with one offset pin; 180–189 – Noval B9A; 190–199 ...
VF14 – Sharp-cutoff pentode, 55 V heater, Y8A 8-pin steel tube base, identical to EF14 and UF14 except for heater ratings [2] VF14M – Selected VF14 in production until the end of the 1950s for use as a preamplifier in Neumann condenser microphones U-47 and U-48 where they were run at only half their rated heater power to reduce noise [ 58 ]
6V6 Octal socket basing diagram. 1 - * Unconnected in all versions except for the shell connection of the metal 6V6 2 & 7 - Filament / Heater 3 - Anode / Plate 4 - Grid 2 / Screen Grid 5 - Grid 1 / Control Grid 6 - No connection. Pin normally absent 8 - Cathode & Beam-Forming Plates. The 6V6 is a beam-power tetrode vacuum tube.
The GU-50 (Russian: ГУ-50) is a power pentode vacuum tube intended for 50 watt operation as a linear RF amplifier on frequencies up to 120 MHz. It is, in fact, a Soviet-produced copy of the Telefunken LS-50 power pentode, [ 1 ] possibly reverse-engineered from German ( Wehrmacht ) military radios captured during World War II , or based on ...
Socket connections; Octal base, (IO) Pin 1, Not used Pin 2, Heater Pin-3, Anode/plate Pin-4, Screen grid, g2 Pin-5, Control grid, g1 Pin-6, Not used Pin-7, Heater. Pin-8, Cathode-beam plates: Typical class-A amplifier operation; Anode voltage: 250V: Anode current: 140mA: Screen voltage: 250V: Bias voltage-15V: Anode resistance: 12 kilohms ...
1-9 Pinch-type construction valves, mostly P8 bases (P base, 8-pin side-contact) or European 5-pin (B base) and various other European pre-octal designs. 10–19 8-pin German metal octal, G8A 20–29 Loctal B8G ; some octal; some 8-way side contact (exceptions are DAC21, DBC21, DCH21, DF21, DF22, DL21, DL21, DLL21, DM21 which have octal bases)
Most vacuum tubes have a limited lifetime, due to the filament or heater burning out or other failure modes, so they are made as replaceable units; the electrode leads connect to pins on the tube's base which plug into a tube socket. Tubes were a frequent cause of failure in electronic equipment, and consumers were expected to be able to ...
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