This is what appears to be a very, very early S.E.X. amp kit, ca. 1995. You can tell because it comes with speakers and the original surplus power transformers which had a propensity to blow. I would suggest to anyone buying it - don't build it! IMO it has far more value kept just as it is. Kinda thinking about bidding myself, to add to my collection of the original prototype S.E.X. amp and the very first S.E.X. kit we sold, which I reacquired several years ago.
https://www.ebay.com/itm/NOS-Vintage-BOTTLEHEAD-S-E-X-Tube-Amp-KIT-Single-Ended-eXperimenters-Amplifier/123916621031?hash=item1cda0194e7:g:FEQAAOSwRbhdiXgu
https://www.ebay.com/itm/NOS-Vintage-BOTTLEHEAD-S-E-X-Tube-Amp-KIT-Single-Ended-eXperimenters-Amplifier/123916621031?hash=item1cda0194e7:g:FEQAAOSwRbhdiXgu