Take a gander at this beautiful homebrew 4-1000A amplifier, which used plug-in coils from a BC-610. The power supply was in a cabinet underneath the amp. It was driven by a Heath SB-200 once in a while. This photo, along with many others from this decade, was sent in by Glenn Kurzenknabe, K3SWZ. Glenn had this photo and the following four digitized from some old slides. Thanks for the effort!