▼ Menu

PM1HF

Sensibly equivalent to:
AR4 CV1303 HL210
See also:
The Azide Process - The Philips-Mullard (PM) Series - Mullard PM1HF Box
    
Extras ▼

 

The PM1HF is part of the first series of Philips-Mullard valves. The filament has an oxide coating applied by the Azide process. The PM1HF was introduced in 1926 as an HF amplifier and also for use as a detector. The µ or amplification factor is 15.
No inter electrode capacitances are quoted for this battery triode valve. The filament would be run from a 2.0 Volt wet accumulator.
The anode is a box placed horizontally in the bulb.
The electrode supports are made of stout wire and emerge from the pinch and then turn through 90 degrees.
The balloon envelope is 40 mm in diameter and, excluding the B4 base pins, is 77 mm tall.
References: 1931 datasheet, 1004 & 1040. Type PM1HF was first introduced in 1926.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
2.0
0.1
100
0
2.3
22.5k
0.8
Thanks to Andy Cowley for supplying the above PDF datasheet.
Updated December19, 2012.
Return to Main Index