▼ Menu

PM254

Sensibly equivalent to:
CV1153 CV1154 NR16 NR16A
See also:
The Philips-Mullard (PM) Series - Mullard PM254 Box - CV1153 short entry - CV1154 short entry
    
Extras ▼

 

The PM254 triode design dates from 1927 and was improved in 1929. It is an audio output valve for battery wireless receivers and described at the time as a 'super-power valve'. The μ was 4.2 and rated output was 380 mW into a 4,500 Ohm load. High impedance headphones are of the order of 4,000 Ohms. The envelope has etched into it a BBC logo, as well as the 254 indicating it is from the original issue. The Bakelite base has a location groove filled with white paint.
The balloon envelope is 43 mm in diameter and, excluding the B4 base pins, is 93 mm tall.
References: 1931 datasheet & 1043. Type PM254 was first introduced in 1927.

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
mAa
Vg
ra
gm
4.0
0.25
150
14.0
-22.5
3,500
2.1
Thanks to Andy Cowley for supplying the above PDF datasheet.
Updated April 04, 2015.
Return to Main Index