Tung-Sol 6SL7GT - black plates, triple mica

This 1960s Tung-Sol 6SL7GT tube has a tall bottle, ribbed gray plates, and a halo getter. The black base has white print with the Tung-Sol logo. Tube tests as new with balanced sections and low noise.

The rare Tung-Sol 6SU7GTY tubes in the precisely matched pair are premium quality 6SL7 types. They have round plates and black glass. The white print on the brown bases has the RCA logo. Both tubes tests as new with balanced sections and low noise.