AF output pentode - JJ Electronic

Class A1 Amp.: ua = 250 V ug2 = 250 V. Rk = 135 Ω. Ia = 48 mA. Ig2 = 5,5 mA. Ra = 5,2 kΩ ug1eff (50mW) = 0,3 V ug1eff(n) = 4,3 V n (10%)1) = 5,7 W n 2) = 6 W.
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EL84

6BQ5 Base: NOVAL Uf = 6,3 V If = 0,760 A

max 71,4 max 77,8

max 22,0

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Limiting Values: Ua = 300 V Wa = 12 W Ug2 = 300 V Typical Characteristics: Wg2 = 2 W Ua = 250 V Ug1 = -100 V Ug2 = 250 V Ik = 65 mA Ug1 = -7,3 V Rg1 = 1 MΩ for automatic bias Ia = 48 mA Rg1 = 0,3 MΩ Ig2 = 5,5 mA for fixed bias S = 11,3 mA/V Uk/f = 100 V Ri = 40 kΩ µg1/g2 = 19 Capacitances: cg/k = 10 pF Class A1 Amp.: ca = 5,1 pF Ua = 250 V cg/a = 0,6 pF Ug2 = 250 V cg1f = 0,15 pF Rk = 135 Ω Ia = 48 mA Ig2 = 5,5 mA Ra = 5,2 kΩ Ug1eff (50mW) = 0,3 V Ug1eff(N) = 4,3 V 1) Ug1 fixed grid bias N (10%)1) = 5,7 W 2) Ig1 = 0,3 µA N 2) = 6 W

A. F. output pentode

A. F. output pentode

Transfer characteristics

plate characteristics Ia(mA) 180 160 140 120 100 80 60 40 20 0

-15

Ug(V)

-10

-5

0

50

100

150

200

250

300

Ua(V)