1960's Sylvania 6SN7GTB ECC33 6SN7 Chrome Top Tubes, Closely Matched Quad, NOS/NIB, Tested

1960's Sylvania 6SN7GTB ECC33 6SN7 Chrome Top Tubes, Closely Matched Quad, NOS/NIB, Tested

These tubes have triangular black plates and halo getters. They have date codes from the 1960's.

These were tested on my calibrated Hickok 539C. They have been tested for shorts, gas, and transconductance. The tubes test with readings of 2200/2200, 2400/2200, 2400/2400 and 2400/2400. Minimum is 1640.

They have been sonically tested in my homebuilt pre-amp and are 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 ship international.

Don't see the tubes you are looking for? Contact me and I may be able to help you.