Mullard Blackburn 12AX7A 12AX7 ECC83 Tube, NOS

Mullard Blackburn 12AX7A 12AX7 ECC83 Tube, NOS, Tested

This tube has gray plates and a halo getter. It was made in the late 1960's at the Mullard Blackburn factory in Great Britain.

This tube was tested on my calibrated TV-7/U tube tester. It has been tested for shorts, gas, and transconductance. The tube tests with readings of 50/52. Minimum is 32.

It has been sonically tested in my homebuilt pre-amp and is dead quiet with no microphonics.

Tubes are described, tested, and presented to the best of my ability, subject to the limitations of the equipment that I have available (Hickok 539C and several TV-7’s). Test results are likely to vary some between your equipment and mine due to the imprecise nature of 60-year-old consumer-grade test equipment.

About me. I have over 62 years of experience in many facets of electronics design and repair. I have been working with tubes since I was 12 years old. I am an active ham radio operator and have been for 62 years. I’m a retired electrical engineer with 30 years in the Semiconductor industry. I’ve been collecting, buying, and selling tubes and other tube based equipment since the 1980s, and have been a Reverb seller since 2020. The pictures you see are of the actual tube(s) you’ll receive. 

I will combine shipping. Just ask.

I will ship international.

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