On Jan 28, 3:29*pm, "PrecisionmachinisT"
wrote:
wrote in ...
in college I learned how to design with vacuum tubes.

Identify the value of component Rk in the following item:

http://www.ebay.com/itm/RCA-TUBE-AMP...-/150984104264

For the 6BQ5 or the 6CG7?

Dan