The NOS Siemens E288CC (8223) tube is a variant similar to 7308 and 6922 tubes. They have filament current that is higher than 6922 tube types but in most circuits it is not substantial enough to be a concern. As well, the bottle is approximately 1/2 inch taller so consider that if space is a concern. These E288CC tubes have gold pins and the internal construction shows grey plates and internal shield with a "A" frame getter assembly. Tubes are in original boxes.
From Joe's Tube Lore:
"Siemens E288CC (with shield, gold pins) More transparent &
dimensional with better bass than the Edicron. Also has more palpable
vocals and a more lively, real sounding presentation than any of the
The Siemens E288CC / 8223 tube is a good option for many high-end linestages or phonostages.