Valvo 12AT7 ECC81 Vacuum Tube For Your Univalve NOS-Testing Rectifiers Gebraucht It has a top double-O

It has a top double-O getter

I just cleaned this LP on my VPI 16

new in box Sylvania 7056 tube tested to spec on our Paul Hart-calibrated TV7/U

60 and 68 where minimum (65%) is 45

Valvo 12AT7 ECC81 Vacuum Tube For Your Univalve NOS-Testing Rectifiers Gebraucht It has a top double-OThis Valvo 12AT7 dual triode was tested on our Maxi Preamp II for shorts, gas, noise, transconductance and gain. There were no shorts, noise or gas. It will also be also as time becomes available on our Paul Hart calibrated TV7 U for a more familiar point of reference for most. Noise: 74 dB 75. 3 dB ( 92 dB is the Maxi Matcher's noise floor) Transconductance: 1400 1762; Gain: 53. 7 54. 4 where 50 50 is new. It sounded balanced, had excellent frequency