eBay

Number 12AU7 ECC82

Manufacturer Sylvania

Branded Baldwin

Country USA

Code 312 139

Date 1961 (139 = 1961 the 39th week)

GM 2377 / 2332 & 2402 / 2417

Plate Gray

Getter O

Plate 1 95.1 / 96.0

Plate 2 93.3 / 96.7

Tested 100 %

Up for your consideration is two closely matched 12AU7 ECC83 USA vacuum tube (gray plate).

The tubes are stamped Baldwin

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 1961 Baldwin 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
The Tube tested at 100% (1.160 x 93.3 = 108.2 %).