7-pin shield base ceramic socket (rsh4 type). Silver-plated contacts!

rsh4 type socket fit to the following tubes: 1A1P, 1A2P, 1B2P, 1K1P, 1K2P, 2P1P, 2P29P, 3C18P, 6V32, 6A2P, 6A3P, 6J1P, 6J1P-V, 6J1P-E, 6J1P-EV, 6J2P, 6J2P-V, 6J2P-E, 6J2P-EV, 6J38P, 6J38P-EV, 6J3P, 6J3P-E, 6J40P-D, 6J4P, 6J53P, 6J5P, 6K1P, 6K4P, 6K4-EV, 6N15P, 6S1P, 6S2P, 6H2P, 6H2P-EV, 6H2P-ER, 6C4P, 6C4P-V, 6C4P-E, 6C4P-EV, EC92 RWN RFT, EC92 Tungsram, SG-16P, SG-1P, SG-1P-EV, SG-SP etc.