▼ Menu

SG215

Sensibly equivalent to:
CV3702
See also:
Mazda 2 Volt Range Advert - Valves for Your Set
    
Extras ▼

 

The SG215 tetrode was introduced in 1930 and was similar to the 1929 215SG. It is a screen grid or tetrode valve for RF amplification in broadcast radio receivers or the wireless as it was known at the time.
The original adverts show that it was initially fitted with a screw top cap. The 'top hat' top cap appeared in the mid 1930s.
The detail photograph is of the control grid. It has the appearance of being hand made rather than the perfectly regular structure expected of a machine wound grid.
The balloon envelope is 43 mm in diameter and, excluding the B4 base pins, is 117 mm tall.
References: 1040. Type SG215 was first introduced in 1930.

 

Pin Connections
B4
1
2
3
4
tc
g2
g1
f
f
a

 

Absolute Maximum Operating Conditions
Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
2.0
0.15
150
60
-1.5
1.5
0.25
1.5M
0.85
Updated May 26, 2018.
shape:balloon construction:pinch type:tetrode age:1930.1940 base:b4 heater:2.0v pins:4 pin:1.g2 pin:2.g1 pin:3.f pin:4.f pin:tc.a
Return to Main Index