Since 1990 I have enjoyed collecting and restoring vintage audio electronics... especially speaker systems and antique radios. All items will be exactly as described ... buy with confidence!

For sale is set of 4, Sylvania 7591A output tubes removed from a Fisher 500C receiver.  I don't know how to test that they are a true "matched" quad, but they appear to be as they were installed at same time by original owner.  Markings on all 4 tubes is AOY... markings on 3 of 4 is em, and 1 of 4 is el (no idea what that indicates?). Tested super strong/good at 120/120 on my B&K 600 tester.

After buyer has left positive feedback to acknowledge everything OK, I will quickly leave positive feedback for buyer.