Up for sale is a matched pair (2 pieces) of premium vintage Siemens E88CC / 6922 audio preamplifier tubes, brand new in individual white boxes. Made in West Germany, these reference-grade tubes feature grey plates, top-mounted halo ring getters, and corrosion-resistant gold pins. Legendary in the audiophile community for their ultra-low noise floor, exceptional speed, precise soundstage imaging, and dynamic clarity.

As shown, both tubes have been thoroughly tested on our laboratory-grade Amplitrex AT1000 tube tester. The measured plate current (Ip) and mutual conductance (Gm) results are calculated against nominal factory specifications (15.0 mA / 12,500 µMhos) and detailed in the table below.