Sensibly equivalent¶ to:
4D1 AR7 C30B CV1000 CV1109 CV3502 DA HL13C NR55 VR109 VT100B
The HL1320 is triode for use on AC or DC mains and thus for use with a series heater chain. The HL1320 was designed for use as a detector or first audio voltage amplifier.
In this exhibit the zinc paint has started to corrode.
The reverse of the envelope is plain metal paint.
The classic envelope is 42 mm in diameter, and excluding the B7 base pins is 103 mm tall.
References: Datasheet, 1040 & 1043. Type HL1320 was first introduced in 1934.
Absolute Maximum Operating Conditions¶
Updated March 12, 2014. shape:classic construction:pinch type:triode age:1930.1940 base:b7 heater:200ma pins:7 pin:1.m pin:2.- pin:3.- pin:4.h pin:5.h pin:6.k pin:7.a pin:tc.g1