Before I got back into using Solid State Amplifiers I had already gone through many tube amp kits, various KT style push-pull builds, 2A3 and a 300B Mono-Block SET for example. I eventually got talked into buying a 845 SET. This was my last tube amp before switching to a Nelson Pass F5 Class A. The build quality for a china made amplifer was high and this thing weighed a ton, far better than the typical China tube amp junk floating about on eBay. It really is a two man lift.. it is that heavy.
However, as good as the sound was on first use it soon became obvious that it could be easily improved and it had a few flaws, namely being a little rough around the edges.
NOS Tube Changes