RCA NOS NIB 60FX5 Vacuum Tube Tested

One Excellent RCA 12SK7 Tube NOS NIB Pentode GM[%]: 90 EM[%]: 95 AMPLITREX

One Excellent RCA 12SK7 Tube NOS NIB Pentode GM[%]: 95 EM[%]: 104 AMPLITREX

1 x NOS RCA 6J7 6Ж7 VT-91 US Made Black Metal Vacuum Pentode Radio Valve Tube

RCA 6AU8A TRIODE/PENTODE VACUUM TUBE ~ NOS, TESTED

6AZ8 RCA Triode-Pentode Vacuum Tube - NOS - TESTED

6AW8A RCA Triode-Pentode Vacuum Tube - NOS - TESTED

1 x NOS RCA 6L6 6L6G Test Strong @ 100% Metal USA Made Vacuum Pentode Tube