SB-230 Single tube amplifier. Pete, wa2cwa On Sat, 17 Oct 2009 15:29:48 -0600 RAY FRIESS <rayfrijr at msn.com> writes: > > > > Did Heathkit, toward the end, make a one tube linear amplifer (other > than the sb220)? My friend says he has one, but I dont recall > heathkit making one other than the 220 or maybe the sb1000