Just aquired a Heathkit Lunchbox"sixer" (HW-29A) that has a Modification kit from Lawrence Engineering, Hamdem,Conn.installed This Mod has 3 tubes:6ea8,6ba6,6bj6 and 3 shielded coils.monted on an aluminum plate that is custom made to fit inside the case. Also has a spotting button! Any help on this mod? I never seen one of these before. w6we.