300B-SE

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300B-SE, customization, is direct-headed type cathode middle- power double triode, used in class A1 amplifier. In audio amplifier, it suits for the condition that the output power is 10W. 

 Maximum Rating 
Ua…………………………480 V
Pa…………………………40 W

Ik
with cathode bias………………100 mA 
with fixed bias……………70 mA

Direct Interelectrode Capacitances
input……………9PF 
output……………4.3PF 
grid to plate……………15PF

Static parameter 

Ua……………………300V 
-Ug………………… 60V 
Ia……………………60mA 
Gm……………………5.5mA/V 
ri……………………0.7 KΩ 
u ……………………3.85 
Pout…………………6.6W
Recommended parameter 
           Ug
Ua Uf(AC) Uf(DC) I a
V --~V----V----   mA
200--33--29.5 --77
200--45--41.5 --20
250--46--42.6 --74
250--57--53.6 --22
300--60--56.5 --68
300--70--66.5 --23
400--86--82.5 --68
400--98--94.5 –19
Limited parameter
450--100--96.5--60




 Typical operating parameter 
Audio amplifier 
class A1
Ua -Ug Ia -RL Pout 2nd
V --V -mA -Ω-W ---db
200 42 30 2000 3 --20
200 39 40 2500 2.6 26
250 55 30 2000 4.9 18
250 52 40 3000 4.0 26
250 50 50 2500 4.4 26
250 48 60 2000 4.7 30
250 48 60 2700 5.0 26
250 45 80 1500 5.0 26
300 65 40 2500 6.7 20
300 63 50 2000 7.2 21
300 63 50 3000 6.1 26
300 61 60 2400 6.6 26
300 58 80 1700 7.5 26
350 76 50 3600 7.8 26
350 74 60 2000 10.2 21
350 74 60 3000 8.3 26
350 74 60 4000 7.0 30
350 71 80 2200 9.6 26
400 91 40 5000 8.4 26
400 89 50 1000 11.5 21
400 89 50 4000 9.4 25
400 87 60 3500 10.5 26
400 84 80 2500 12.5 25
450 104 40 6000 9.5 26
450 102 50 5000 10.7 27
450 100 60 4000 12.5 26
450 100 60 5500 10.1 30
450 97 80 2000 17.8 21
450 97 80 1000 14.6 26
450 97 80 4500 11.5 31