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Vacuum Tube FU50 1pc Inventory Product Small 300B for Tube Amplifier Headphone Amp High Reliability
Model No: FU50
Type: Parathermal cathode beam pentode
Main use: for high frequency oscillation and power amplification
Filament voltage (Uf) = 12.6V;
Filament current (If) = 0.6 ~ 0.8A;
Anode voltage (Ua) = 800V;
Second gate voltage (Ug2) = 250V;
The third gate voltage (Ug3) = 0V;
The first gate operation accounts for a bias voltage of 1 (Ug1) - 55 ~ -25V;
The first gate reverse current 2 (-Ig1) ≤ 15μA;
The third gate reverse current 2 (-Ig3) ≤ 50 μA;
Transconductance 3 (S) = 3 ~ 5.2 mA / V;
Leakage current between the filament and the cathode 4 (Ifk) ≤ 100μA;
The second gate current 5 (Ig2) ≤ 7 mA;
Output power 6 (Po) ≥ 50W;
Output power 6 ≥ 40W when the filament voltage is 10.8V;
Life time 7 (T) ≥ 500h. (Life boundary conditions) output power (Po) ≥ 40W;
Maximum height (excluding the insertion and removal handle) (Hmax) = 93.5mm;
The maximum diameter (Dmax) = 45.3mm;
Maximum weight (Gmax) = 100g.
2Uf=14.5V, Ug3=-200V, Rt=350Ω, Rg1≤0.1MΩ, when Ig2=15mA, 3Ia=50mA, △Ug1=5V;
4Uf=14.5V, Ufk=±200 hours;
5Ia=50mA, the second point voltage on g2 is 150V;
6Ug1=-100V, Ia≤150mA, Ig1≤8.5mA, Ig2≤20mA, Ug1～=135V;
7Ia=130mA, Ufk=200V, Ig1≤9mA.
Input capacitance (Cin) = 13 ~ 15pF;
Output capacitance (Cout) = 8 ~ 11pF;
The transition capacitance (Cag) ≤ 0.1pF.
(Limit Use Data)
Maximum filament voltage (Ufmax) = 13.9V;
Minimum filament voltage (Ufmin) = 11.3V;
Maximum anode voltage (Uamax) = 1kV;
Maximum second gate voltage (Ug2max) = 250V;
Maximum anode dissipation power (Pamax) = 40W;
Maximum second gate dissipation power (Pg2max) = 5W;
Maximum first gate dissipation power (Pg1max) = 1W;
Maximum cathode current (Ikmax) = 230 mA;
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