Hi guys, Please be nice as I am a solid state Marantz guy that is starting to look at tubes. I know its a slippery slope, but I think tube guys are willing to grease it up for me . About 5 years ago, the console stereo we got from my grandmother stopped turning on. Knowing it was a tube radio, i thought a tube burnt out and I replaced ALL of them with exact replacements. Needless to say, I am a more educated person, and realized that this radio also has fuses. Coming back to my parents house, I found the culprit fuse and replaced it. After letting it warm up, sound started playing . I think it sounds darn fine for what it is, I was just wondering a few things. I'm not selling this unit, its got too much sentimental value, plus I think it looks cool . but some general info is great. (1) The console says "Koronette" and was made in Germany (East). The radio part itself says Fisher Sonic. I am wondering if it was a common unit to put into consoles, and how they rate for my first foray into tube gear. The sound to me is very crisp in the lows, but with a nice full midrange, the top end is limited by the speakers, but still sounds good. A very good ambiance type system as we used to use the radio for holiday dinners. (2) Upon initial turn on, there was lots of buzzing and hum, Could this be the replacement tubes turning on for the first time? (3) There are two plugs for additional speakers. The writing says NUR FUR WECHSELSTROM LEISTRUNSAUFNAHME 80 WATT. Can I run another set of speakers? I would like to run some KLH 17s or 23s...But I dont know how much stress a tube console can take? (4)There is an underlying 60Hz hum on the system even with the volume at 0. What should I be looking for to address this? (5) There is a pair of tubes that seem to indicate tuning strength and MX or STEREO. The tuning meter seems to work, but nothing comes out of MX or STEREO. Hitting the stereo switch cuts the sound completely, am I missing anything? (6) The balance doesnt quite work, would this unit benefit from a de-oxit bath? (7) There is no AM reception, what should I look for? (8) I am assuming the tuner section is solid state, the tube count is too low for a tube tuner.? I am sure I will have more questions as time goes on...but for now ill just include lots of pictures.