The APPJ/ Miniwatt has been around for a number of years. I think I bought mine back in 2010 and she's still going strong. The new version has the tubes on top and transformers on bottom but it's essentially the same amp. You can often find these for around $100. To my ears it's SQ is comparable to my Dennis Had EL84 SE amp. It's power tubes are 6P1's and there are convertors on ebay that allow you to substitute different tubes.