Hi Ralph. I'm not 100% but i think that model is TUBE based one. Case not... it shouldn't be close to.

I still have an old TUBE one here. An old TeKtronik. It was my first one i got for 20$ at the college sale in the past. By turning the power on, you see the rooms light dimming. As you said, it produce an interesting heat while it run. Perfect to replace defective room heater, your wife/girlfriend or to keep your cofee/tea cup hot

Anyway, it's something good to start. Better than PC-Based software using PC-Sound card.