Add to Cart Quick view RCA set of (3) 6JB6 Tubes Used, Tested & Guaranteed for the RL Drake TR-4 & TR-4C Series RCA MSRP: Now: $39.99 Was: RCA set of (3) 6JB6 Tubes Used, Tested & Guaranteed for the RL Drake TR-4 & TR-4C Series 6JB6 and 6JB6A tubes are interchangeable These 6JB6 tubes are used and in excellent condition, and all test full emission. These tubes and all... MSRP: Now: $39.99 Was: Add to Cart Quick view Qty in Cart: 0 Quantity: Decrease Quantity: Increase Quantity: Price: MSRP: Now: $39.99 Was: Subtotal: Add to Cart