6DJ8 ECC88 6922 AMPEREX 4 MATCHED QUAD TUBES 1960s HOLLAND GRAY-PLATE GUARANTEE
Perfect Matched Quad, top conditions
I assure you that they are excellent tubes.
Tube test values is perfect
Tested on Amlitrex AT-1000 tube tester
%100 = IP: 15 GM: 12.5
tube 1
section 1 IP: 15.8 ma / GM: 13.1
section 2 IP: 15.5 ma / GM: 12.9
tube 2
section 1 IP: 15. ma / GM: 13.0
section 2 IP: 14.9 ma / GM: 12.7
tube 3
section 1 IP: 15.0 ma / GM: 13.0
section 2 IP: 15.0 ma / GM: 13.0
tube 4
section 1 IP: 14.9 ma / GM: 13.0
section 2 IP: 14.8 ma / GM: 12.9
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