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1A7GT

Sensibly equivalent to:
CV1802 DK32 VT-147 X14
See also:
Dario 1A7GT Box
    
Extras ▼

 

The 1A7GT is a heptode frequency changer. The 1A7GT is designed for battery superhet radio receiver use. The local oscillator is formed between the cathode and grid 2. Grid 1 being the oscillator control grid. The pulsating electron flow is screened by Grid 3 from the oscillator and grid 5 from the anode. In this screened space is the mixer control grid g4. For maximum isolation between oscillator and signal circuits the mixer control grid is taken to the top cap.
The wide glass tube envelope is 30 mm in diameter, and excluding the IO base pins is 86 mm tall.
References: Datasheet, 1040 & 1043. Type 1A7GT was first introduced in 1937.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
s
f+
a
g3,g5
g1
g2
f-
-
g4

 

Absolute Maximum Operating Conditions
Heptode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
1.4
0.05
110
60
-0
0.6
0.7
0.6M
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated June 28, 2014.
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