Here is a pair of National USSR 6L6GC radio transmitter guitar amp power vacuum tubes that have gray plates and 

tested good at 100 and 85 on my tester, minimum good is 70 and max is 130

. They are in good clean condition, see the pics for condition, testing and all that is included. These are used power vacuum tubes made in the USSR. 

Guaranteed good to play. 

They will be packaged for safe shipping. See my other items, vintage tubes and more. Shipping is done by USPS. Ebay automatically adds state sales tax. For multiple items, click Buy it Now or ADD TO CART, then Request Total From Seller to receive a combined invoice. The more you buy the more you save. No returns or refunds of any kind on International overseas sales or combined sales.