WE 300B Vacuum Tube Precision Matching Amplifier(2 pcs)

Preamps
WE300B
Filament Heating
Uf (DC)....5V
If (DC)...............1.2A
Static parameters
Voltage input.................300 V
-Ug.................60V
Ia........................60mA
Transconductance................................5.5 mA/V
ri........................0.7 K
You.....................3.85
Pout....................6.6W
Restrict Rating
Anode voltage...............480V
Anode power dissipation.........40W
Cathode current
Self bias.................100 mA
Fixed bias voltage..................70mA
Interelectrode capacitance
Input capacitance................9PF
Output capacitance................4.3PF
Inter-circuit capacitance..................15PF
Typical operating parameters
Audio Amplifier
Class A1 Amplification:
Ua -Ug Ia RL Pout Second
Voltage Current mA Watts 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 26
250 48 60 2700 4.1 30
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
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