(!) (BEST PAIR) 6CA4 RCA NOS 1960's - 1972 (54-56/40 and 54-54/40) (Wright, Counterpoint, Cary, Zanden)

1 pair) 6CA4 RCA NOS 

1 tube) 54/40 and 56/40 (DX) 1972

1 tube) 54/40 and 54/40 (1960's)

recommended for:

- Wright Sound phono
- Counterpoint 5.1
- Reinhardt SVT-18 guitar amp
- STROMBERG CARLSON
- Cary SLP90 preamp
- BOGEN DB230
- Marshall EL84 amp
- Concert fidelity preamp
- Zanden 3000 preamp
- Concert Fidelity CF-080-LSX2 Refurbished