TUBE: 46
FICHIER SOURCE: sheets/021/4/46.pdf
FABRICANT: RCA (Receiving Tube Manual)
ANNÉE: n/d
LANGUE: en

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RCA-46 — DUAL-GRID POWER AMPLIFIER
"The 46 is a double-grid power-amplifier tube recommended especially for service in Class B amplifier circuits of suitable design."
Brochage (top): culot Medium 5-Pin. G1(pin3), P(pin2), G2(pin4), F(pin1), F(pin5). [DEUX grilles séparées G1 et G2]

CHARACTERISTICS:
Filament Voltage (A.C. or D.C.) = 2.5 V
Filament Current = 1.75 A
Bulb: S-17 ; Base: Medium 5-Pin

As Class B Amplifier (Grid No.1 and No.2 connected together at socket):
Plate Voltage = 400 max V
Peak Plate Current = 200 max mA
Average Plate Dissipation = 10 max W
Typical Operation (2 tubes):
  Plate Voltage = 300 / 400 V
  Grid Voltage = 0 / 0 V
  Zero-Signal Plate Current = 8 / 12 mA
  Effective Load Resistance (plate-to-plate) = 5200 / 5800 Ω
  Power Output (approx.) = 16* / 20† W
  (* 950 mW input entre grilles ; † 650 mW input entre grilles)

As Class A1 Amplifier (Grid No.2 connected to plate at socket):
  Plate Voltage = 250 max V
  Grid Voltage = -33 V
  Plate Current = 22 mA
  Plate Resistance = 2380 Ω
  Amplification Factor = 5.6
  Transconductance = 2350 µmhos
  Load Resistance (max undistorted power) = 6400 Ω
  Undistorted Power Output = 1.25 W

INSTALLATION: socket 5-contact, vertical ou horizontal. Filament 2.5V. Grille et retour plaque (Class B) au point milieu du filament ou centre d'une résistance 20Ω. Page 132.

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APPLICATION: en Class B audio, les deux grilles sont reliées ensemble (signal appliqué aux deux). Pour Class A1, la grille adjacente à la plaque est reliée à la plaque -> ampli Class A pour driver de deux 46 en Class B. Tube à double service.
[courbes seules] AVERAGE PLATE CHARACTERISTICS Class B (Ib & Ic1 vs plate volts, grilles +5..+50); OPERATION CHARACTERISTICS Class B (Po/THD/Ib/Ig vs driver signal). Page 133.

--- CHAMPS EXTRAITS ---
Type: DUAL-GRID power amplifier (bigrille). 2 grilles séparées (G1 contrôle + G2 adjacente plaque). NI triode simple NI tétrode à écran: fonctionne en triode dans les 2 modes (grilles reliées = mu élevé Class B; G2->plaque = mu bas 5.6 Class A1). PAS une tétrode beam ni pentode.
heater_v=2.5 ; heater_a=1.75
va_max=400 (Class B) / 250 (Class A1) ; pa_max=10 (par tube, Class B)
ipk_max=200 mA ; vg1: -33V (Class A1), 0V (Class B)
socket="Medium 5-Pin" ; bulb S-17
pinout: pin1=f; pin2=p(plaque); pin3=g1; pin4=g2; pin5=f
operating_points: A1 (Va250,Vg-33,Ia22,gm2.35,rp2380,mu5.6,RL6400,Pout1.25W); B 2-tubes (Va300,Vg0,Ia0=8,RLpp5200,Pout16W) et (Va400,Vg0,Ia0=12,RLpp5800,Pout20W)