RCA Clear Top 12AU7 ECC82 Vacuum Tube For Your Bottlehead Or Univalve NOS-Testing Westinghouse NIB Celebrate the twenty-fourth anniversary of

Celebrate the twenty-fourth anniversary of that time with actual Protest Art made by Someone Who Was There

copper support rods and round mica spacers

Delco-BRANDED 6SK7 tested as good on our Paul Hart-calibrated TV7/U

There is some marking in the first twenty pages or so

black and silver bottles and 6-52 188-5 and 3-09 188-5 provenance/date codes

RCA Clear Top 12AU7 ECC82 Vacuum Tube For Your Bottlehead Or Univalve NOS-Testing Westinghouse NIB Celebrate the twenty-fourth anniversary ofThis new old stock testing RCA clear top 12AU7 dual triode was tested on our Maxi Preamp II for shorts, gas, noise and gain. There were no shorts, noise or gas. Measurements are as follows: Noise dynamic range: 84. 6 dB 84. 9 dB; Transconductance: 1264 1360 and Gain (Mu): 16. 1 17. 2 New 12AU7s typically test within a standard deviation of 17 17 for gain. The noise floor on this tester is 92dB 92dB. There is no transconductance reference reading and