TUBE: 300B (work order alias 300B-XLS-EmissionLabs)
SOURCE: sheets/163/3/300B.pdf
FABRICANT: JJ Electronic (www.jj-electronic.sk) — "Excellence with every decibel"
ANNEE: non visible
LANGUE: en
PAGES: 1 (2-page spread on one PDF page, pp.24-25)

===== PAGE 1 (spread pp.24-25) =====
300 B   R. F. TRIODE   (JJ Electronic)
"Moderate power, filamentary triodes for Class A service."
Base: 4-PIN CERAMIC BASE
 Uf = 5 V ; If = ca 1.3 A
Typical characteristic:
 Ua = 300 V ; Ug1 = -61 V ; Ia = 60 mA
 S = 5.5 mA/V ; Ri = 700 Ohm ; mu = 3.85
Limiting values:
 Ua = 450 V ; Wa = 40 W
 Maximum plate current of average tube for fixed bias   Ia = 70 mA
 Maximum plate current for manually adjusted grid bias or self-biasing   Ia = 100 mA
Capacitances:
 Cg1 = 17 pF ; Ca = 11 pF ; Cg1-a = 7.5 pF
Dimensions and connections:
 max 62 / max 45 (dia); max 145 / max 165 (height).
 Pin diagram (4-pin): a (anode/plate), g (grid), f/k, f/k (filament).
 (=> SINGLE GRID. Directly-heated filamentary TRIODE.)

[courbes seules — pas de donnees tabulaires] Plate characteristics (Ia vs Ua, Ug=0 to -140V) and
 transfer characteristics (Ia=f(-Ug), Uf=5V, Ua=100 to 450V).