Description
Tested Pair of 63 50 Sylvania Audio Receiver Guitar Vacuum Tubes Made in the USA Black curved ladder plates, dual spacers, halo wire getter frames and top getter flashes One tube is NOS NIB Please review the photos for more detail. Excellent strong balanced test results for Gm: 5.5 / 5.3 and 5.0 / 4.9 For Gm, 3.0 is the suggested minimum value No shorts. For reference we use a calibrated Triplett 3444A tube tester Estimated delivery within the USA is from 3 to 7 business days Our standard service is US Postal 1 st class We combine shipping when applicable Please contact us with any questions