Hello all~ I recently was given a Kris 600 SSB linear amp. I know nothing about it and found next to little info on the web about them too?? Are they junk or a good one. I see it runs on 4 tubes. Anyone know the wattage, are the tubes hard to find ?? What does one think it is worth?? I cannot even find one on eBay......are they that rare or just not popular. Please help and thank you very much.