6CU5, Westinghouse, Beam Power Amplifier Vacuum Tube - NOS - TESTED

6CU5 RCA Power Pentode Vacuum Tube - NOS - TESTED

6CU5 Sylvania Beam Power Pentode Vacuum Tube - NOS - TESTED

12DQ6B 12GW6 Sylvania Beam Power Pentode Vacuum Tube - NOS - TESTED

One ZENITH 6AD10 Tube NOS NIB Pentode/Beam Power Tube B&K Test Results

6AS5 RCA Beam Power Pentode Vacuum Tube - NOS - TESTED

6CD6GA RCA Beam Power Pentode Vacuum Tube - NOS - TESTED

Sylvania 6AQ5A Vacuum Tube Vintage NOS Beam Power Pentode