TUBE: 6L6G (sheet also covers 6L6)
SOURCE FILE: sheets/127/6/6L6G.pdf
MANUFACTURER: TUNG-SOL (Electron Tube Division, Newark NJ)
YEAR: 1952 (Sept 1, 1952; copyright 1952)
TYPE (per PDF): BEAM PENTODE [= beam power tetrode; Tung-Sol's label]
PAGES: 6 (pages 1-3 data, pages 4-6 curves only)

===== PAGE 1 =====
TUNG-SOL — 6L6G, 6L6 — BEAM PENTODE
COATED UNIPOTENTIAL CATHODE. HEATER 6.3 VOLTS 0.9 AMP. AC or DC. Any mounting position.
Envelopes: 6L6 = MT-10 metal shell (small wafer 7-pin octal); 6L6G = ST-16 glass bulb (medium shell 7-pin octal). Basing 7AC.
"The 6L6 and 6L6G are designed with high power sensitivity and high efficiency for service in the output stages of AC receivers..."
DIRECT INTERELECTRODE CAPACITANCES (6L6 / 6L6G):
  Grid to Plate = 0.4 / 0.9 µµF
  Input = 10 / 11.5 µµF
  Output = 12 / 9.5 µµF
FOOTER: PLATE 3025, SEPT 1 1952

===== PAGE 2 =====
RATINGS (per RMA standard M8-210), columns Triode Connection / Pentode Connection:
  Heater Voltage = 6.3 / 6.3 V
  Max Heater-Cathode Voltage = 180 / 180 V
  Max Plate Voltage = 275 / 360 V
  Max Grid #2 Voltage = (plate) / 270 V
  Max Plate Dissipation = 19 / 19 W
  Max Grid #2 Dissipation = --- / 2.5 W
  Max Grid #1 Circuit Resistance: fixed bias 0.1/0.1 MΩ ; cathode bias 0.5/0.5 MΩ
CLASS A1 AMPLIFIER — PENTODE CONNECTION (3 columns):
  Plate Voltage: 250 | 300 | 350 V
  Grid #2 Voltage: 250 | 200 | 250 V
  Grid #1 Voltage: -14 | -12.5 | -18 V
  Peak AF signal: 14 | 12.5 | 18 V
  Transconductance: 6000 | 5300 | 5200 µmhos
  Plate Resistance: 22500 | 35000 | 33000 ohms
  Zero-sig Plate Current: 72 | 48 | 54 mA
  Max-sig Plate Current: 79 | 55 | 66 mA
  Zero-sig Grid#2 Current: 5 | 2.5 | 2.5 mA
  Max-sig Grid#2 Current: 7.3 | 4.7 | 7 mA
  Load Resistance: 2500 | 4500 | 4200 ohms
  Power Output: 6.5 | 6.5 | 10.8 W
  THD: 10 | 11 | 15 %
CLASS A1 AMPLIFIER — TRIODE CONNECTION (g2 to plate):
  Va=250V; Vg1=-20V; Peak AF=20V; gm=4700 µmhos; Plate Res=1700 ohms; µ=8;
  Zero-sig Ia=40mA; Max-sig Ia=44mA; Load=5000 ohms; Pout=1.4W; THD=5%
FOOTER: PLATE 3026, SEPT 1 1952

===== PAGE 3 =====
CLASS A1 PUSH-PULL AMPLIFIER — PENTODE CONNECTION (values for two tubes; 2 columns):
  Plate Voltage: 250 | 270 V
  Grid#2 Voltage: 250 | 270 V
  Grid#1 Voltage: -16 | -17.5 V
  Peak AF grid-grid: 32 | 35 V
  Transconductance(each): 5500 | 5700 µmhos
  Plate Res(each): 24500 | 23500 ohms
  Zero-sig Ia: 120 | 134 mA ; Max-sig Ia: 140 | 155 mA
  Zero-sig Ig2: 10 | 11 mA ; Max-sig Ig2: 16 | 17 mA
  Load Resistance: 5000 | 5000 ohms
  Power Output: 14.5 | 17.5 W ; THD: 2 | 2 %
CLASS AB1 PUSH-PULL — PENTODE (two tubes; 2 cols):
  Va: 360 | 360 V ; Vg2: 270 | 270 V ; Vg1: -22.5 | -22.5 V ; Peak AF g-g: 45 | 45 V
  Zero-sig Ia: 88 | 88 mA ; Max-sig Ia: 132 | 140 mA
  Zero-sig Ig2: 5 | 5 mA ; Max-sig Ig2: 15 | 11 mA
  Load: 6600 | 3800 ohms ; Pout: 26.5 | 18 W ; THD: 2 | 2 %
CLASS AB2 PUSH-PULL — PENTODE (two tubes; 2 cols):
  Va: 360 | 360 V ; Vg2: 225 | 270 V ; Vg1: -18 | -22.5 V ; Peak AF g-g: 52 | 72 V
  Zero-sig Ia: 78 | 88 mA ; Max-sig Ia: 142 | 205 mA
  Zero-sig Ig2: 3.5 | 5 mA ; Max-sig Ig2: 11 | 16 mA
  Load: 6000 | 3800 ohms ; Pout: 31 | 47 W ; THD: 2 | 2 %
FOOTER: PLATE 3027, SEPT 1 1952

===== PAGE 4 =====
[courbes seules] 6L6,6L6G plate characteristics: Ib & Ic2 vs plate volts, Ef=6.3, Ec2=250V, Ec1 +15 to -25V (top); Ib vs plate volts, Ec2 50-300V, Ec1=0 (bottom).

===== PAGE 5 =====
[courbes seules] Harmonic distortion & signal volts vs power output (Eb=Ec2=250, Ec1=-14, RL=2500); Power output & distortion vs load resistance.

===== PAGE 6 =====
[courbes seules] Triode-connected plate characteristics, Ef=6.3, Ec1 +15 to -90V. (Lower panel blank.)

NOTE: "BEAM PENTODE" is Tung-Sol's name for the beam power TETRODE — same 6L6 structure (beam-forming plates, one control + one screen grid). Declared TETRODE = CONFIRMED. Octal 7-pin. Vh=6.3V/0.9A. Va max 360V (pentode conn), Vg2 max 270V, Pa 19W, Pg2 2.5W, Vh-k 180V.