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PCC89

Sensibly equivalent to:
4021 7FC7
See also:
Frame Grid Valves - Making a Mullard Valve - The PC97 - a tutorial - Frame-grid valves for TV - Frame-grid valves for TV
    
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The PCC89 is a high gain, high frequency, frame grid double triode for domestic television receivers. It was designed as a cascode RF amplifier to operate in Band III up to 220 MHz.
The packaging used by Mullard for these relatively modern valves featured a moulded plastic carrier within the card box rather than a corrugated wrap and had the trade name Kradlepak.
The anode has as much area as possible to dissipate heat but the face opposite the cathode is formed by a deep depression.
As an RF valve there is much screening between sections.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 48 mm tall.
References: Data-sheet & 1040. Type PCC89 was first introduced in 1959.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
k(2)
g1(2),s(2)
a(2)
h
h
g(1)
k(1)in
k(1)out
a(1)

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
7.5
0.3
90
-1.2
15
2900
12.3
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 30, 2021.
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