Description
Number 12AU7 ECC82 Manufacturer GE Branded Hammond Country USA Code 188 64-30 / 65-35 D ate 1964 / 1965 GM 2082 / 2087 & 2195 / 2237 Plate Gray Getter O Plate 1 83.3 / 87.8 Plate 2 83.5 / 89.5 Tested 96 % Up for your consideration is two closely matched 12AU7 ECC83 USA vacuum tube (gray plate). The tubes are stamped Hammond The tubes were tested on a TV-7 tube tester that was calibrated professionally by Dan Nelson it has a digital meter. Pulled from a 1960 Hammond tube organ On the TV 7 the minimum requirement rating is 50. 50= 65% of the value of a new tube. Each unit of measurement on the Tv 7 for this tube = 1.160 T he Tube tested at 98% (1.160 x 83.3 = 96.6 %).