▼ Menu

R Type

Sensibly equivalent to:
R. TM
    
Extras ▼

 

This exquisite R Type valve is smaller than the usual varieties and the grid is smaller and wound to a finer pitch. We believe that this was made in Europe after WW1.
Another R Type in the museum has a very similar construction externally and the etching on the bulb says that was made in Holland.
Seen end on the electrode structure and the intact tungsten filament can be seen. Tungsten filaments of this age are extremely fragile.
The type designation is missing from the envelope but operating voltages are etched into the glass. The filament is designed to operate on 4 Volts and the anode supply can be between 60 and 100 Volts.
The balloon envelope is 48 mm in diameter and, excluding the B4 base pins, is 80 mm tall.
References: Private communication, 1005 & 1003. Type R Type was first introduced in 1916.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
ra
gm
4.0
0.7
100
40k
0.26
Updated January 08, 2013.
Return to Main Index