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Pen220A

Sensibly equivalent to:
220PT CV1051 VT51
See also:
MAZDA HL2 S215VM Pen220 Pen220A P220 & P220A Advert - MAZDA Pen220 & Pen220A Advert - Mazda Pen220 & Pen220A Advert - CV1051 short entry
    
Extras ▼

 

The Pen220A from Mazda is a battery output pentode.
The anode load impedance is given as 6,000 Ohms and it would generate 1.1 Watts of audio at 7% distortion.
The literature gives 1933 as the date of introduction, however, the Mazda advert places the introduction at April 1932.
The wide spaced wire grid structure can be seen from the top of the dome as the anode cavity has an open top. The filament is a double inverted V.
The balloon envelope is 45 mm in diameter and, excluding the B5 base pins, is 96 mm tall.
References: 1040, 3002 & 1043. Type Pen220A was first introduced in 1931.

 

Pin Connections
B5
1
2
3
4
5
a
g1
f(-)
f(+)
g2

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Pout
D
2.0
0.2
150
150
-9.0
18
3.6
270,000
2.2
1.1
7%
Updated April 03, 2015.
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