I've been an audiophile for over 50 years... I wanted to create an eBay Store that catered to Musicians, Audiophiles, Collectors, etc... We will carry all types of tubes but I specialize in high-end Preamp & Power Tubes... All my tubes are extensively tested for Mutual Conductance, Emissions, Leakage, Shorts and Noise on an Amplitrex AT1000... Everything I sell is 100% Guarantee unless noted otherwise...