GU-50 GU50 ГУ-50 MATCHED PAIR RUSSIAN VACUUM PENTODE POWER TUBE TESTED NOS LS50

About Item : GU-50 (LS50, ГУ50) MATCHED PAIR, RUSSIAN AUDIOPHILE PENTODE TUBE.TESTED. Equivalent to the LS50. Tube is tested with professional tube Tester L3-3. Uf = 12.6 V, Ua = 100 V, Ug2 = 100 V, Ia = 50 mA, Ig2 <= 5 mA.

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