The 6AS7G is a double triode with special properties. The AC anode resistance is very low at 280 Ω and the mutual conductance is considerable at 7.5 mA/V. This valve could be used in low voltage power supplies as a series pass device or it could be used for a direct drive audio amplifier. Use as a series element in a stabilised power supply was probably the original use.
each anode is a pair of finned flat U channels either side of the cathode assembly.
The earliest reference we found was in the 1950 RCA data book.
Unlike the Russian made 6AS7G this exhibit has radiating fins at both top and bottom of the grid supports. This construction points to supplying current for Class A operations such as a series pass valve, the heater power also supports this.
The RCA logo and Made in USA on the base cap.
Looking along the grid axis.
The classic envelope is 51 mm in diameter and, excluding the IO base pins, is 114 mm tall.
References: Data-sheet & 4040. Type 6AS7G was first introduced in 1946. See also1946 adverts.
