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If the set says anything about "solid state" or "transistorized" on it; it's not tube. Also, look on the back and see if there's some sort of warning about "no user serviceable parts inside." This usually means no tubes inside. Most tube sets have a warning something like "This cover is provided with a safety interlock to prevent dangerous electrical shock. To service tubes, remove back cover completely." If the set can be plugged in; you can look through the vent holes on the back and often see tubes lit. Also, if it takes a minute or two to warm up; then, it has tubes. There are hybrid sets that have solid state signal and audio circuits and will have sound instantly. The 4 tube Zenith hybrids come to mind here. As far as the best later tube sets to look for (IMHO) would be Zenith and RCA. Of course, any decent looking tube set would be worth grabbing especially if the price is right.
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