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13VPA

Sensibly equivalent to:
9D2 C50N CV1106 VP1322
    
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The 13VPA is an HF screened pentode with a vari-μ characteristic. The amplifier gain is altered by changing the bias point via an AGC voltage derived from the signal. The greater the signal the more negative the AGC line and thus the lower the amplification of the controlled stage. The AGC or earlier AVC (Automatic Volume Control) has the function of avoiding overloading of the receiver by strong local signals.
The suppressor grid has a separate pin to allow for extra control of the valve this allows the 13VPA to act as a mixer if required. The five pin based version has g3 tied internally to the cathode.
We also have the 13VPA with a clear envelope.
The top view with the control grid connected to the top cap.
The Cossor box. The price was fixed at 10/6. Resale Price Maintenance was considered against public interest and the 1964 Resale Prices Act ended the practice.
Thanks to Mark from Vintage-parts for sending these images.
The classic envelope is  mm in diameter, and excluding the base pins is  mm tall.
References: Datasheet & 1043. Type 13VPA was first introduced in 1935.

 

Pin Connections
B7
1
2
3
4
5
6
7
tc
-
a
g3
h
h
k
g2
g1

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
μ
13
0.2
250
125
-1
10.0
3.5
0.6M
1.65
1,000
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 20, 2017.
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