▼ Menu

VHTA

 
    
Extras ▼

 

The VHTA is a heptode (pentagrid) mixer or frequency changer. The 200 mA heater indicates that it was for use with a series heater chain across the mains. The anode voltage of 200 Volts is consistent with UK mains voltages. The signal is taken to grid 4 at the top cap.
The B7 Base pins.
Thanks to Mark Mallison for sending the images.
The balloon envelope is  mm in diameter, and excluding the B7 base pins is  mm tall.
References: 1040 & 1043. Type VHTA was first introduced in 1935. See also 1935 adverts.

 

Pin Connections
B7
1
2
3
4
5
6
7
tc
g2
g1
g3,g5
h
h
m,k
a
g4

 

Absolute Maximum Operating Conditions
Heptode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
13.0
0.2
200
100
-1.5
3.2
5.6
0.5M
0.65
Updated August 23, 2022.
Return to Main Index