Mullard ECC83 / 12AX7 B8F/B8H (ECC83 / 12AX7) Tubes (Pair) - Blackburn 1958 Round Getter

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General:
An excellent pair of robust 12AX7 tubes from Mullard.

These tubes are technically used but test above NOS (New Old Stock) spec on our Amplitrex AT1000 tube tester. 

This set features closely associated date codes, manufactured only a few months apart in 1958 - Blackburn. Both tubes test very close to NOS.

Included with the tubes is their original packaging.

SkyFi Cosmetic Notes:
We are including a set of original Mullard boxes. These boxes show shelf wear including torn/missing flaps and some pen markings.

The tubes themselves have significant lettering wear. You may desire to clean/treat the pins further before putting them into service.

SkyFi Technical Notes:
Amplitrex AT1000 Test Results

Test Result Format, Shown as % of NOS spec:
Triode 1 Plate Current / Triode 1 Gm
Triode 2 Plate Current / Triode 2 Gm

Tube 1:
108/100
100/93

Tube 2:
100/93
100/93

Both tubes also tested very good with regards to microphonic performance.

Ownership:
Second Owner

General Sound:
Smooth, uncolored, undistorted natural and clean

Cosmetic Condition:
9/10 = Excellent. Perfect physical condition, gently used. See our detailed rating description here.

Working Condition:
Working perfectly and tested in our lab.

Included:
Just the Unit

Packing:
Original Manufacturers Packing