General Electric GE 12AT7 ECC81 6679 Vacuum Tube Premium NOS NIB

General Electric GE 12AT7 ECC81 6679 Vacuum Tube Premium NOS NIBThis new old stock, new in box industrial grade GE 6679 12AT7 dual triode was tested on my Hickok 600A for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 4100 3400 micromhos. (New 6679s typically test within 1. 5 standard deviation of 4000 micromhos; minimum (65%) is 2600). It has gray, wing plates; a top, slant D getter and excellent flashing. I am playing them in my Bottlehead Crack headphone amplifier as I

They tested 51

Transconductance measured 57 for Tube One and 65 for Tube Two where minimum (65%) is 36 and 100% is 55

I wish I could tell you how they sound and from what I can suss out

STOLEN AND LOST

WE CANNOT TEST FOR CATASTROPHIC FAILURE

The dust jacket is in very good condition

They measured (from left to right) 28

I am playing it in Bottlehead Crack headphone amplifier as a 12AU7 substitute and it sounds fine

There are nine new old stock

(New 6SN7s typically test from 2600 micromhos and the Jackson expresses this as a percentage

steel support rods and gray plates

IF IT APPEARS THE ITEM HAS ACTUALLY BEEN STOLEN