Hello! I am very excited.I am aquiring a Sparton highboy that I am 99% sure is a 301 equasonne.(not the really huge one).I don't know what power tubes it has yet but they could be 50's.I hope so because that would be really cool,I love huge tubes and you can still get them and there are some new Chinese built ones.The craftmanship on the radio is gorgeous and there are doors that open to expose the radio.Anyways what is with the #50 and#10 power tubes being so rare ?Were these only made for Sparton radios?I see that the 50's can handle something like 600 plate volts.Why were these discontinued? One more thing,if the power tubes are 182's or 183's can these be substituted with 71A's?Does anyone here own one of these radios?
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Chris 
EdM 