Add to Cart Quick view CBS-Hytron 5U4GB Vintage 1960s Rectifier Tube NOS in Box Tested / Guaranteed CBS MSRP: Now: $19.99 Was: CBS-Hytron 5U4GB Vintage 1960s Rectifier Tube NOS in Box Tested / Guaranteed This Tube and all others I sell, have been tested on a B&K Dyna-Quik Model 700 Dynamic Mutual Conductance Tube... MSRP: Now: $19.99 Was: Add to Cart Quick view Qty in Cart: 0 Quantity: Decrease Quantity: Increase Quantity: Price: MSRP: Now: $19.99 Was: Subtotal: Add to Cart