Very rare and great sounding tubes, carefully matched with balanced sections. They come in reprinted Siemens boxes.
These tubes can be used like CCa / ECC88 / 7DJ8 / E88CC / 6922 substitution in many amplifiers, DACs and preamps.
They are pull outs from professional back up device I dismantled more than 25 years ago. More than 50pcs, all the same codes, many pairs in stock.
They are the same codes, and they had to be checked from time time, so the printings are faded out, but the tubes are perfect, with lot of life left, tested for low noise and microphonics in RIAA preamp.