The Alpha 8100 is a manual-tune HF linear amplifier providing full legal power plus, on all amateur HF bands. Rugged design offers maximum durability and reliability. Features a multi-color LED bargraph displays for power output, reflected power, as well as one that is switchable to indicate plate current, plate voltage, grid current, or gain. Vacuum relays are used, allowing full break-in operation (QSK). Like all Alpha Radio Products, the 8100 comes with a 4-year warranty.