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PCL86

Sensibly equivalent to:
14GW8
See also:
Valves and their Habits - Mazda TV Valves advert
    
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The PCL86 was designed for the audio stage of a television receiver and offered a quality output.
The triode section provided the first audio amplification, and the output pentode would drive the loudspeaker.
The PCL86 as a single ended audio amplifier would have a cathode resistor of 125 Ω and an anode load of 5,100 Ω and under these conditions would produce an output power of 4.1 Watts at a distortion of 10%, more than adequate for a domestic television receiver.
The triode is seen end-on with the screen separating it from the pentode section.
The pentode section has only two grids, both wound on copper supports. The suppressor function is provided by beam forming plates - Mazda has implemented the design as a beam tetrode.
The control grid is topped by heat radiating fins.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 70 mm tall.
References: Data-sheet & 1040. Type PCL86 was first introduced in 1961. See also 1961 adverts.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
g1(t)
k(t)
g2
h
h
a
k,s,g3
g1
a(t)

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
13.3
0.3
230
230
-5.7
41.0
10.5
16,000
7.5

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
13.3
0.3
230
-1.7
1.2
62,000
1.6
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 07, 2019.
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