Made in Sylvania electronic tube Export USA. TESTED GOOD IN MY TUBE B & K 707. Engraved in class 6973 USA.Excellent sound for guitar, jukebox and hi-fi amps. Never compare with chinese, russian or 6CZ5,6GM6, 6EM5 tube.
By GOOD in B&K Model 707 Tester. With NO shorts or grid emissions. New in original box SYLVANIA Vintage NOS. I will send you a tracking code when I deposit the package.
This item is in the category "Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Parts & Accessories\Vintage Tubes & Tube Sockets". The seller is "radiogdl" and is located in this country: MX. This item can be shipped worldwide.