Tube set is listed here for informational purposes only and not sold individually. It is only available with the purchase of an RM-10 MK III Kit or fully built stereo amplifier. When selecting either RM-10 MK III product you will be given the option to add the tube set to the order. Tube set includes 4 x Ei 6BQ5/EL-84 and 2 × RAM Super Low Noise 12AX7.