Best Pair) 6CG7=6FQ7 RCA clear top NOS chrome electro-static shield between plates 1962 (7.0/7.5ma and 7.2/8.2ma) (rare) - Tube World Express | Rca, Clear top, Marantz
RCA 12au7 Clear Top - Tube Maze
RCA 12AU7 Vintage NOS Vaccuum Tube clear Top - Etsy Canada
NOS Tube Store: RCA 12AU7A Clear Tops
12AU7 Tube NOS Balanced RCA Clear Top Side D Getter ECC82 5814 5963 CV4004 CV491 | eBay