Up for sale is a matched quad (4 pieces) of ultra-rare vintage Telefunken EL156 high-power audio pentode output tubes, brand new in white boxes. Made in West Germany, these legendary tubes feature original Telefunken diamond glass logos, heavy-duty internal plate structure, and metal ring base construction. Regarded as one of the finest and most powerful audio output pentodes ever built, offering astonishing dynamic range, low distortion, and superb German audio precision.

As shown, all four tubes are in pristine New Old Stock (NOS) condition with clear, crisp factory print.