Sensibly equivalent¶ to:
The PL504 is a purpose designed television pentode line output valve. The peak anode voltage is quoted as 7,000 Volts and shows why the line output stage of a television receiver was the last consumer electronics product to remain a valve. The CRT and magnetron excepted of course.
The discoloured glass following a hard live.
The wide glass tube envelope is 28 mm in diameter, and excluding the B9D base pins, is 90 mm tall.
References: Data-sheet & 1040. Type PL504 was first introduced in 1961.
Absolute Maximum Operating Conditions¶
Updated March 24, 2014. shape:wide.glass.tube construction:all.glass type:pentode age:1960.1975 base:b9d heater:300ma pins:9 pin:1.g1 pin:2.g1 pin:3.k.g3 pin:4.h pin:5.h pin:6.g2 pin:7.g2 pin:8.k.g3 pin:9.k pin:tc.a