6CA7 EI Yugoslavia Fat Boy EL34 Platinum Matched Quad 90%

A perfectly matched quad (4 tubes) of genuine 6CA7 / EL34 "Fat Boy" (fat bottle) tubes, manufactured by the EI Nis tube factory in Yugoslavia during the 1990s.

Slightly used, carefully matched, and tested to 90% of NOS values. These tubes still have plenty of life left in them.