TK16
Headphoneus Supremus
Only 3 pair of the "low priced" Heerlen 6922 D-getters. Tube Museum.
http://www.ebay.com/itm/BEST-NOS-AMPEREX-HOLLAND-6922-E88CC-TUBES-LOW-NOISE-MATCHED-PAIR-D-GETTERS-1958-/292041072424
Another? Quad Siemens CCa silver shield $249.99 OBO.
http://www.ebay.com/itm/CCa-Siemens-Audio-Tube-4-piece-Tested-Excellent-worldwide-free-shipping-/122375236748
http://www.ebay.com/itm/BEST-NOS-AMPEREX-HOLLAND-6922-E88CC-TUBES-LOW-NOISE-MATCHED-PAIR-D-GETTERS-1958-/292041072424
Another? Quad Siemens CCa silver shield $249.99 OBO.
http://www.ebay.com/itm/CCa-Siemens-Audio-Tube-4-piece-Tested-Excellent-worldwide-free-shipping-/122375236748