Pair (2) tubes 6688 / E180F

Nice Old D RING getter !

Photo shown is not correct but will be revised.

Widely used in professional Audio radio and testing equipments

The improved version of E80F?

Wide-Band Full Range 10,000 hours Long Life Pentode with Ultra-Low-Noise/Micrfonic?

Sound Element Ideal for high-end input stage for DIYer

ElecTube