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HL41

Sensibly equivalent to:
3A/204D CV24
    
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The HL41 is an externally screened indirectly heated amplifier triode of medium impedance. It was designed as an oscillator or RCC amplifier. At the time Mazda had a passion for applying metallisation to valves even if it was not indicated electrically.
This device was aimed at being the first audio stage in a TRF radio receiver or a superhet with external signal detection. The HL41/DD added a pair of signal diodes to the triode amplifier.
The reverse is kept as plain zinc paint.
The classic envelope is 32 mm in diameter and, excluding the MO base pins, is 80 mm tall.
References: Data-sheet, 1040 & 1043. Type HL41 was first introduced in 1938.

 

Pin Connections
MO
1
2
3
4
5
6
7
8
h
k
a
-
g1
m
-
h

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
4.0
0.65
250
-4.5
7.0
11,500
3.1
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated May 17, 2021.
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