6S4P-EV (original box)

The 6S4P-EV tube – high-frequency high-durability low-noise triode.
Designed to operate in the input stages of high-frequency amplifiers in circuits with a grounded cathode. Works in any position.
Base 9-pin.

E – the letter characterizing the increased durability of the tube
V – tube with increased reliability and mechanical strength

• Stamp of technical control department of the manufacturer ” ОТК “

Technical specifications:

• Filament voltage: 6.3 ± 0.6V 
• Filament current: 300 ± 25mA 
• Anode voltage nominal: (constant) 150V 
• Anode voltage limit: (constant) 160V 
• Anode current: 15 ± 4mA 
• Cathode current limit: 20mA 
• Grid voltage limit: (constant) -50V 
• Grid electronic current cutoff voltage: not more than -1.1V 
• Reverse grid current: 0.3uA 
• Power dissipated by the anode: limit 3W 
• Slope: 19.5 ± 4.5mA/V 
• Gain: 50 ± 15 
• Equivalent tube noise resistance: 170Ohm 
• Cathode resistance for automatic bias: 100Ohm 
• Resistance in the grid circuit limit: 0.5MOhm

Minimum operating time – 10000 hours.