Add to Cart Quick view RL Drake TR-4 / TR-4C Tube Set (3) Sylvanias 6JB6 & (1) RCA 12BY7 Used & Tested MSRP: Now: $49.99 Was: RL Drake TR-4 / TR-4C Tube Set (3) Sylvanias 6JB6 & (1) RCA 12BY7 Used & Tested This tube and all others, has been tested on a B&K Dynaquick 700 Tube tester. It shows grid full emission. MSRP: Now: $49.99 Was: Add to Cart Quick view Qty in Cart: 0 Quantity: Decrease Quantity: Increase Quantity: Price: MSRP: Now: $49.99 Was: Subtotal: Add to Cart