RCA 12AT7WA ECC81 Vacuum Tube Milspec Black Plate NOS-Testing For Your Univalve Geprueft S15 RCA-BRANDED 6GB5 tube tested to

RCA-BRANDED 6GB5 tube tested to spec on our Paul Hart-calibrated TV7/U

I am playing it in one of my ArtSound single-ended amplifiers with Steely Dan’s seminal "Aja" album

coated glass 50L6GT tubes was tested on our Paul Hart-calibrated TV7/U for shorts

Etsy will indicate how many are available in this Dutch Auction

RCA 12AT7WA ECC81 Vacuum Tube Milspec Black Plate NOS-Testing For Your Univalve Geprueft S15 RCA-BRANDED 6GB5 tube tested toThis new old stock testing milspec, black plate 12AT7WA ECC81 dual triode was tested on my Hickok 600A for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 3900 4500 micromhos. (New 12AT7s ECC81 typically test within 1. 5 standard deviations of 4000 micromhos). It sounded balanced, had excellent frequency response and was very quiet in my Bottlehead, though this headphone amp is not optimized for this tube type.