Add to Cart Quick view United Electron 811A vacuum tubes Set of (4) Made in England All Tested Full Output United Electron MSRP: Now: $199.99 Was: United Electron 811A vacuum tubes Set of (4) Made in England All Tested Full Output I tested this set of 4, 811As in an Ameritron 811 Amplifier, one at a time they are all full emission... MSRP: Now: $199.99 Was: Add to Cart Quick view Qty in Cart: 0 Quantity: Decrease Quantity: Increase Quantity: Price: MSRP: Now: $199.99 Was: Subtotal: Add to Cart