Valvo 12AT7 ECC81 Vacuum Tube For Your Univalve NOS-Testing Rectifiers Gebraucht This lot of six RCA

This lot of six RCA 6GH8A tubes tested to spec on our Paul Hart-calibrated TV7/U

I just cleaned this LP on my VPI 16

new in box Sylvania 1X2 tubes tested to spec on our Paul Hart-calibrated TV7/U

new in box RCA Number 37 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 This lot of six RCAThis 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