This is a used 4-400 linear amplifier that was used only on 20 meters. It needs a few wires resoldered under the chassis but it seems to be in good shape otherwise. I haven\'t had it on the air but I see no reason why it would be hard to get it there. If there are any questions please feel free to ask.The 4-400 tube looks to be fairly new with no discoloration of the tube. The filament looks pretty new too and checks good with the ohmmeter.This amp weighs 22 lbs.. Thanks and happy offerding.....Don...W7dpv

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