Brimar STC 6057 CV4004 ECC83 12AX7 Matched pair New Tested

Brimar STC  6057 CV4004 ECC83 12AX7  Matched pair New Tested

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MATCHED PAIR – Tested on AVO VCM163
Selected from my valves/tubes

    Test Values – average new         Current  1.2 + 1.2mA          Gain  1.6 + 1.6mA/V
  Valve/Tube1     (Ref 191)               1.4 + 1.4mA                 1.7 + 1.7mA/V
  Valve/Tube2 (Ref 197)                    1.6 + 1.4mA                 1.8 + 1.7mA/V
They therefore test as 100% +

These are the military grade tubes of the ECC83/12AX7 and can replace them directly

These have 15mm  box ladder anodes/plates top ring getters .

They both have the same code 1K48977 date codes 7535
They were therefore made in 1975

Pictures are of the actual tubes

Kindly note that they are only tested electrically.No audio tests are made and I cannot comment on audio performance.No returns accepted based on perceived audio performance.

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