GU-50 GU50 ГУ-50 MATCHED QUAD RUSSIAN VACUUM PENTODE POWER TUBE TESTED NOS LS50
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. Envelope: glass, no-base. Output power, W, max. - over 1,750 h of service 40.