13-01-2020, 12:40 PM
(This post was last modified: 13-01-2020, 12:53 PM by Mike Watterson.)
NO. Battery valves for 1.4V at least:
Edge Connect (P8A), Octal (K8A), Mazda Octal (K8B), German Y8, Rimlock, B7G, subminiature B8D (pins or left long as wires), subminature crimp outside (often 5 wires or cut for sockets), and various subminiature Russian tyes and USA 8 pin Loctal B8G.
A few subminiature are 0.65V and some battery valves have a centre tap for series 50mA or 25mA, or parallel 1.4V.
Note that 1.5V LT radios are really nominal 1.4V and recommended for 1.35V off a mains PSU. Many "6.3V" types originated with 3 x Lead Acid car battery, often with a vibrator for HT. Such a battery is closer to a nominal 7V on charge, hence USA "7" series.
The 2V valves were never intended to be connected to a cell on charge. Same with the 4V and 6V variants of same designs that went out of popularity when filament currents got lower in 1928 to 1934. By 1935 there may have only been 2V battery types. The 1.4V type first came out in 1938 as Octal / Loctal Sylvania and the similar filament current and spec RCA B7G came in late 1939/1940, plenty of portables and personal sets in USA in 1941 before Pearl harbour. UK used P8A, Mazda Octal and regular Octal versions of the 1.4 Sylvania tubes from 1939 to 1950 and even 2V tubes for rural table models till 1950. The RCA B7G first in the Romac in UK in 1946 and not widely in UK till 1947.
Germany used Telefunken Y8 1.3V from about 1941 till about 1950 (parallel only as various currents and NiCd as LT regulator on mains) as well as regular 1.4V valves from 1945.
Philips did the most B8A rimlock 1.4V types and developed the 25mA B7G in about 1953.
Some battery valves are nickel filament and some tungsten.
There are loads of 6.3V B7G, particularly in USA, Commerical and Military gear. The USA also used B7G 115V heater rectifiers for battery/mains sets.
Also the 150mA (H) is rare in UK but common in USA and in USA B7G, Loctals and Octals.
The 2V battery types in at least 4 pin (maybe 3 kinds), (some pentodes, 5th side pin, TC or 5th pin), 6 pin (US & UK), Old British 7 pin and Octal.
Edge Connect (P8A), Octal (K8A), Mazda Octal (K8B), German Y8, Rimlock, B7G, subminiature B8D (pins or left long as wires), subminature crimp outside (often 5 wires or cut for sockets), and various subminiature Russian tyes and USA 8 pin Loctal B8G.
A few subminiature are 0.65V and some battery valves have a centre tap for series 50mA or 25mA, or parallel 1.4V.
Note that 1.5V LT radios are really nominal 1.4V and recommended for 1.35V off a mains PSU. Many "6.3V" types originated with 3 x Lead Acid car battery, often with a vibrator for HT. Such a battery is closer to a nominal 7V on charge, hence USA "7" series.
The 2V valves were never intended to be connected to a cell on charge. Same with the 4V and 6V variants of same designs that went out of popularity when filament currents got lower in 1928 to 1934. By 1935 there may have only been 2V battery types. The 1.4V type first came out in 1938 as Octal / Loctal Sylvania and the similar filament current and spec RCA B7G came in late 1939/1940, plenty of portables and personal sets in USA in 1941 before Pearl harbour. UK used P8A, Mazda Octal and regular Octal versions of the 1.4 Sylvania tubes from 1939 to 1950 and even 2V tubes for rural table models till 1950. The RCA B7G first in the Romac in UK in 1946 and not widely in UK till 1947.
Germany used Telefunken Y8 1.3V from about 1941 till about 1950 (parallel only as various currents and NiCd as LT regulator on mains) as well as regular 1.4V valves from 1945.
Philips did the most B8A rimlock 1.4V types and developed the 25mA B7G in about 1953.
Some battery valves are nickel filament and some tungsten.
There are loads of 6.3V B7G, particularly in USA, Commerical and Military gear. The USA also used B7G 115V heater rectifiers for battery/mains sets.
Also the 150mA (H) is rare in UK but common in USA and in USA B7G, Loctals and Octals.
The 2V battery types in at least 4 pin (maybe 3 kinds), (some pentodes, 5th side pin, TC or 5th pin), 6 pin (US & UK), Old British 7 pin and Octal.
