TWO Amperex ECC82 12AU7 tubes

Tubes test at 1890, 1800 and 1800, 2000 where pass/fail is 1430 micromhos

Foil D getters / 45 degree angle slanted D

Long plates / 17mm ribbed plates

Made in Holland

Δ6D etched date code =

Δ = Phillips, Heerlan Holland factory

6 = 1956

D = April

Δ8F etched date code =

Δ = Phillips, Heerlan Holland factory

8 = 1958

F = June

Tested on Amplitrex AT-1000 tube tester (fixed bias mode)

FULL TEST RESULTS:

Tube 1:

1890 gm / 1800 gm (uMhos)

8.4 mA / 7.6 mA Plate Current Emissions (iP)

NO SHORTS / ZERO GAS

% Test results in percent %

85.9% / 81.8% gm (uMhos)

80% / 72.3% mA plate current

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Tube 2:

1800 gm / 2000 gm (uMhos)

8 mA / 8.8 mA Plate Current Emissions (iP)

% Test results in percent %

81.8% / 90.9% gm (uMhos)

76.1% / 83.8% mA plate current

NO SHORTS / ZERO GAS

USA Shipping free priority

international shipping = UPS 7 day delivery signature service or Global Post 10 day delivery depending on your country