Sell Vacuum Tubes 300BA

Vacuum Tubes 300BA
300B Series Straight heating cathode middle power double tridoes used in the amplifing of A1. It is adapt to be used in audio frequency which needs the output power is 100W.
300B-C long-life design, use pure graphite anticathode and plate dissipation power can reach 60W. If you adjust the electrical route properly, single tube can amplify A1, and can get the higher output power than 20W.

limit rating
plate voltage480V
plate dissipation power40W
cathodecurrent
自 partial voltage100 mA
fixuppartial voltage70 mA

capacitance between poles
input capacitance9PF
output capacitance4.3PF
transroute capacitance15PF

static state parameter
Ua300V
-Ug 60 V
Ia60mA
Gm5.5mA/V
Ri0.7 K(Ohms)
53.85
Pout6.6W

filament heating
Uf(DC) 5V
If(DC)  1.2A

Ug
---------Ua Uf(AC) Uf(DC) Ia
----------V --~V---- =V----mA
commend
parameter-----33 ---29.5 --77
---------200{ 45 --41.5 --20
---------------46-- 42.6-- 74
---------250 { 57 --53.6 --22
---------------60-- 56.5 --68
---------300 { 70-- 66.5-- 23
---------------86-- 82.5-- 68
---------400 { 98-- 94.5-- 19
limit
parameter450 100-- 96.5--- 60