This low cost tube preamplifier lets you experience "tube sound".
It is based on two low power consumption Raytheon JAN6418 sub-miniature pentodes.
These tubes were made in USA very late in the peak of the tube making era, around 1980.
Even when used in conjunction with solid state power amplifiers, pro-fessional musicians have described this preamplifier as adding a real "richness", and "warmth" to the sound.