TUBE: A2134
SOURCE FILE: sheets/126/a/A2134.pdf
MANUFACTURER: Marconi's Wireless Telegraph Company Limited (Chelmsford)
YEAR: MARCH 1955
PAGES: 12

===== PAGE 1 =====
MARCONI — A2134 — MINIATURE OUTPUT PENTODE — 6.3V INDIRECTLY HEATED
The A2134 is the commercial equivalent of CV2179. Particularly suitable as the series valve in voltage stabilising equipment.
BASE: B7G. BULB: Tubular. Overall length 64-70 mm; Seated length 58-64 mm; Max diameter 19 mm.
PINOUT (view from underside of base, B7G): Pin1=g1; Pin2=g3,k; Pin3=h; Pin4=h; Pin5=a; Pin6=I.C.; Pin7=(blank/k?)  [drawing: h top, a pin5, g3/k pin2, g1 pin1]
HEATER:
  Vh: 6.3 V
  Ih: 0.635 A
MAXIMUM RATINGS (design centre):
  Pentode connection:
    Va: 300 V
    Vg2: 300 V
    Vh-k (pk): 150 V
    Pa: 9 W
    Pg2: 3 W
  Triode connection:
    Va,g2: 300 V
    Pa,g2: 12 W
CHARACTERISTICS:
  Pentode connection:
    Va: 165 V
    Vg2: 165 V
    Vg1: -9 V
    µ: 220
    ra: 23.2 kΩ
    gm: 9.5 mA/V
  Triode connection:
    Va,g2: 165 V
    Vg1: -9 V
    µ: 10
    ra: 835 Ω
    gm: 12 mA/V
CAPACITANCES (of unscreened valve):
  Ca-all: 10 pF
  Cg1-all: 10 pF
  Ca-g1: 0.3 pF
TYPICAL OPERATION — Pentode Connection, Single Valve, Class A (5 columns):
  % full input: 45 / 100 / 100 / 75 / 50
  Va: 100 / 150 / 165 / 165 / 165 V
  Vg2: 100 / 150 / 165 / 165 / 165 V
  Vg1(o): -4.6 / -7.8 / -9.3 / -10 / -11.4 V
  Ia(o): 39 / 56 / 53 / 40 / 29 mA
  Ig2(o): 6.5 / 9.5 / 9 / 7.2 / 5.4 mA
  Rk: 100 / 120 / 150 / 220 / 330 Ω
  vin(pk): 5 / 7 / 8.5 / 6.7 / 4.7 V
  RL: 2.5 / 3 / 3 / 4 / 6 kΩ
  Pout: 1.45 / 3.5 / 4.1 / 2.84 / 2.3 W
  D: 8.6 / 11 / 10 / 10 / 10 %

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Two Valves Push-pull Class AB1 (per pair):
  Va: 100/165/200/250 V
  Vg2: 100/165/165/165 V
  Vg1(o): -5/-11.9/-10/-11.2 V
  Ia(o): 70/107/87/66 mA
  Ia (max sig): 73/110/100/80 mA
  Ig2(o): 12/18/14/10 mA
  Ig2 (max sig): 15/36/25/24 mA
  Rk (per valve): 120/150/200/300 Ω
  vin(pk)(g1-g1): 11/20/25/30 V
  RL(a-a): 3/3/4.5/7.5 kΩ
  Pout: 2.25/9/11.5/13.3 W
  D: 3.3/4.6/4/4.5 %
Triode Connection, Two Valves Push-pull Class AB1 (per pair):
  Va,g2: 165 V; Vg1(o): -10.5 V; Ia,g2(o): 65 mA; Ia,g2(max sig): 74 mA; Rk(per valve): 330 Ω; vin(pk)(g1-g1): 24 V; RL(a-a): 3 kΩ; Pout: 2.6 W; D: 1.4 %
GRID RESISTOR: max DC grid-cathode resistance 0.27 MΩ ±20% auto-bias; 0.1 MΩ fixed bias.
SCREENING: none internal/external. MOUNTING: any. VENTILATION: bulb hottest point must not exceed 250°C. MICROPHONY: free in normal receiver applications.

===== PAGE 3 =====
[courbes seules] PENTODE CONNECTION, Vg2=165: Ia and Ig2 vs Va, grid bias family +1 to -19.

===== PAGE 4 =====
[courbes seules] PENTODE CONNECTION, Vg1=0: Ia and Ig2 vs Va, screen voltage family 100-165.

===== PAGE 5 =====
[courbes seules] TRIODE CONNECTION: Ia vs Va, grid bias family 0 to -34.

===== PAGE 6 =====
[courbes seules] PENTODE CONNECTION single valve class A: Pout & D% vs vin, Va=Vg2=100, RL=2.5kΩ, Rk=100Ω.

===== PAGE 7 =====
[courbes seules] Pout & D% vs vin curves (Va=Vg2=165 RL=3k Rk=150; and Va=Vg2=150 RL=3k Rk=120).

===== PAGE 8 =====
[courbes seules] Pout & D% vs vin, single valve class A 75% input power, Va=165 Vg2=165 RL=4k Rk=220.

===== PAGE 9 =====
[courbes seules] Pout & D% vs vin, single valve class A 50% input power, Va=Vg2=165 RL=6k Rk=330.

===== PAGE 10 =====
[courbes seules] Push-pull Pout & D vs vin(g1-g1), Va=Vg2=165 RL(a-a)=3k Rk=150/valve; and Va=Vg2=100 RL=3k Rk=120.

===== PAGE 11 =====
[courbes seules] Push-pull Pout & D, Va=250 Vg2=165 RL=7.5k Rk=300; and Va=200 Vg2=165 RL=4.5k Rk=200.

===== PAGE 12 =====
[courbes seules] TRIODE CONNECTION push-pull Pout & D vs vin(g1-g1), Va=165 RL(a-a)=3k Rk=330/valve. OV.2784.