E2d Siemens 4S11 STC Britain
Hi quality output pentode for professional audio amplifiers, long life 10000 hours.
Uf=4V If 1.5A
Triode mode: Ua=250-300V, Ia=37mA, Rk=155ohm, Ra=7Kohm, Pout=4-5W
Similar tubes by Philips: TS34, TS37, 18014
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