New old stock pair of OA2 voltage-regulator tubes. Both are Sylvania tubes, although one carries Philips branding. Each tube tested good and strong on a Triplett 3423 tube tester
New old stock pair of OA2 voltage-regulator tubes. Both are Sylvania tubes, although one carries Philips branding. Each tube tested good and strong on a Triplett 3423 tube tester