Black Plates Gray Coated.
They are carefully matched with balanced sections. They come in NOS JAN boxes. The same codes, from 50s..
They are tested with 250V on anodes and screen grids and -12V on grids. Carefully matched within 5%!
Model: 6V6GT
Country/Region of Manufacture: United States
Brand: RCA
Country of Manufacture: America
Type: 6V6GT