Another easter egg that was hidden in my grandfather's house. --------------------------------- #electronics #vac#vacuumtube #vacuumtube #vintageelectronics #electronicengineering #vintagephotos #pho#photoart #photo
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Зодиакальный круговорот триодов, пентодов и тетродов #vacuumtube #pentode #triode #tetrode
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