Up for sale here is this used Magnavox-badged Sylvania smoked-glass 6L6GA vacuum tube.  I tested it on my B&K 747B tube tester, and it tested at 59, on a scale of 0-120, where 65 is minimum good.  It did not show any shorts or grid emissions.  

This is a good tube and is guaranteed to work for you.  Please see my pictures for details.

US shipping and handling is $4, and international is $14.  I accept Paypal.  If you have any questions, please ask.

I have a number of other tubes & sockets, collectibles, Magic cards, and vintage electronics listed--feel free to take a look!