TUBE: 6V6GT (sheet headed 6V6-GT; curves reference 6V6-G/(T))
SOURCE FILE: sheets/084/6/6V6GT.pdf
MANUFACTURER: RADIOTRON / AWV (Amalgamated Wireless Valve Co. Pty. Ltd., Sydney, Australia)
YEAR: December 1944 (supersedes 6V6-G Data Sheet issued August 1941); curves dated Aug 1941
TYPE (per PDF): BEAM POWER AMPLIFIER (beam power tetrode)
PAGES: 8 (pages 1-2 data, pages 3-8 curves only)

===== PAGE 1 =====
RADIOTRON — 6V6-GT — BEAM POWER AMPLIFIER
Coated Unipotential Cathode.
  Heater Voltage = 6.3 V (a-c or d-c)
  Heater Current = 0.45 A
Direct Interelectrode Capacitances (approx):
  Grid to Plate = 0.7 µµF
  Input = 9.0 µµF
  Output = 7.5 µµF
Maximum Overall Length 3-5/16"; Max Seated Height 2-3/4"; Max Diameter 1-5/16"; Bulb T-9.
Base: Intermediate Shell Octal 7-Pin.
BOTTOM VIEW (G-7AC):
  Pin1=No Connection; Pin2=Filament(heater); Pin3=Plate; Pin4=Screen(g2);
  Pin5=Grid(g1); Pin6=No Connection; Pin7=Filament(heater); Pin8=Cathode.
  Mounting position: Any. Maximum Ratings are Design-Centre Values.
SINGLE VALVE AMPLIFIER — Class A1 (max ratings):
  Plate Voltage = 315 max V ; Screen Voltage = 285 max V ; Plate Dissipation = 12 max W ; Screen Dissipation = 2 max W
Typical Operation (3 cols):
  Plate Voltage: 180 | 250 | 315 V
  Screen Voltage: 180 | 250 | 225 V
  Grid Voltage: -8.5 | -12.5 | -13 V
  Peak AF Grid Volts: 8.5 | 12.5 | 13 V
  Zero-Sig Plate Cur: 29 | 17.5(?45) | 34 mA
  Max-Sig Plate Cur: 30 | 47 | 35 mA
  Zero-Sig Screen Cur: 3 | 0.7(?4.5) | 6 mA
  Max-Sig Screen Cur: 4 | 1.3 | 6 mA
  Plate Resistance: 0.058 | 0.094 | 0.052 meg (58k/94k/52k)
  Transconductance: 3700 | 3440(?4400) | 4100 µmho
  Load Resistance: 5500 | 14000(?5000) | 8000 ohms
  Total Harm. Dist.: 8 | 8 | 12 %
  Max-Sig Power Output: 10(?2.0) | 4.5 | 5.5 W
[Note: some single-valve column figures faint/overstruck on scan; values cross-checked with GE sheet where ambiguous — Va=250 col matches GE: Ia=45, Ig2 zero 4.5, gm 4100, RL 5000, Pout 4.5W]
AMPLIFIER — Class A1 (Triode Connection):
  Plate Voltage = 250 / 300 max V ; Plate & Screen Dissipation (total) = 12.5 max W
  Typical: Va=250/300V; Vg1=-12.5/-13V; Cathode Bias Res=400/513 Ω; Zero-Sig Ia=37.5/39 mA;
    µ=9.8/9.8; Rp=2400/2400 Ω; gm=4000/4000 µmho; Sec Harm=5/5 %; Load=9800/12000 Ω; Pout=1.0/1.65 W
PUSH-PULL AMPLIFIER — Class AB1 (values for two valves):
  Plate Voltage = 250 | 285 | 315 max V (header)
FOOTER: AMALGAMATED WIRELESS VALVE Co. PTY. LTD., Sydney. December 1944. SHEET 1.

===== PAGE 2 =====
RADIOTRON — 6V6-GT — BEAM POWER AMPLIFIER (cont., push-pull table, 2 cols A1 / AB1-style):
  Screen Voltage: 250 | 285 V
  Grid Voltage: -30 | -38 V (g-g range)
  Peak A-F Volts (G-G): 30 | 38 V
  Zero-Sig Plate Cur: 70 | 76.5 mA
  Max-Sig Plate Cur: 79 | 92 mA
  Zero-Sig Screen Cur: 5 | 4 mA
  Max-Sig Screen Cur: 13 | 13 mA
  Eff Load Res (P-P): 10000 | 8000 ohms
  Total Harm Dist: 3.5(?) | 3.5 %
  Max-Sig Power Output: 10 | 14 W
PUSH-PULL Triode Connection:
  Plate Voltage = 300 max V ; Plate & Screen Dissipation (total) = 12.5 max W
  Typical (Class A1 / Class AB1): Va=300/300V; Grid Voltage=-20/-25V; Cathode Bias Res=255/- Ω;
    Peak AF (G-G)=40/50V; Zero-Sig Ia=78/42 mA; Eff Load(P-P)=9800/4775(?) Ω; Pout=3.3/4.75 W
NOTES (footnotes):
  - Heater should be operated at 6.3V; under max dissipation, heater-cathode voltage difference kept <=7.0V.
  - Input coupling should not introduce too much grid-circuit resistance: transformer/impedance recommended;
    grid resistor <0.1MΩ (fixed bias) / up to 0.5MΩ (cathode bias).
  - Negative bias from external source or cathode-bias resistor.
  - Screen connected to plate at the socket (triode connection).
FOOTER: (continuation, Sheet 1 set)

===== PAGE 3 =====
[courbes seules] 6V6-G(T) average plate characteristics: Ib & Ic2 vs plate volts, Ef=6.3, Screen=285V, Ec1 0 to -35V.

===== PAGE 4 =====
[courbes seules] Average plate characteristics with Ec1 variable, Screen=250V; load line corrected for screen redistribution.

===== PAGE 5 =====
[courbes seules] Average plate characteristics, Ef=6.3, Screen=225V; plus 6V6-G plate characteristics Eg2=300V Ec1 variable.

===== PAGE 6 =====
[courbes seules] 6V6-G average plate characteristics with Ec1 variable.

===== PAGE 7 =====
[courbes seules] 6V6-G triode mutual characteristics, screen tied to plate, Ef=6.3.

===== PAGE 8 =====
[courbes seules] 6V6-G average plate characteristics, triode connection, g2 tied to plate.

NOTE: Declared TETRODE = CONFIRMED (beam power amplifier; beam plates on pin 8). Octal 7-pin (G-7AC). Vh=6.3V/0.45A.
Va max 315V, Vg2 max 285V, Pa 12W, Pg2 2W. Caps Cin=9.0, Cout=7.5, Cg-p=0.7pF — matches GE. Triode-connected µ=9.8.
Some single-valve typical figures partly illegible on this 1944 scan; ambiguous cells flagged with (?) and reconciled against GE/MAZDA where the operating point is identical.