▼ Menu

VR65A

Sensibly equivalent to:
ARP19 CV1335 CV1574 SP41
See also:
The First Airborne Radar - Television RF Valve Development
    
Extras ▼

 

The VR65A is a television HF amplifier pentode for operation at 45 MHz with external metalisation as shielding. The original design was from Mazda, and other manufacturers copied this successful design after it had become established.
This exhibit is in a tubular envelope, the other VR65A exhibit is in a classic envelope of the same design as the branded SP41 and SP61, thereby suggesting its origin.
By contrast with the short lived EF50, the SP41, SP61 and the VR65A were virtually indestructible.
The 4.0 V heater was common in the UK during the 1930s when mains sets first began to appear. The first American AC heater standard was 2.5 Volts. The mid 1930's American 6.3 Volt standard was eventually universally adopted.
The wide glass tube envelope is 30 mm in diameter and, excluding the MO base pins, is 80 mm tall.
References: Datasheet, 1040 & 1043. Type VR65A was first introduced in 1938.

 

Pin Connections
MO
1
2
3
4
5
6
7
8
tc
h
k
a
g2
g3
m
-
h
g1

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
4.0
0.95
200
200
-1.5
10.9
2.7
0.7M
8.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 26, 2013.
Return to Main Index