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> New in box national 12SY7 radio converter tubes - 12SA7
New in box national 12SY7 radio converter tubes - 12SA7
New in original box National 12SY7 radio pentagrid converter tube
These new old stock National 12SY7 pentagrid converter tubes are tested as new on our B&K 707 tube tester.
The 12SY7 tube is listed as an excellent substitute (1970 Tube Substitution Guidebook by H. A. Middleton) for the 12SA7 tube.
