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Matsushita ECC85/6AQ8
Telefunken ECC85/6AQ8
Siemens ECC85/6AQ8
“when i upgrade it to ECC85 NOS Siemens,the sound became stunning in therms of detail and depth” Read
National Union 6SN7GT Black Glass
Raytheon 6SN7GT Black Glass Flat Plates
Ken-Rad 6SN7GT/VT-231 Clear Glass
Despite many discussions on the topic of Black vs Clear, there are no difference – sound wise – between clear glass and black glass versions of Ken-Rad 6SN7 tube. I tried to find them in multiple amps, but failed. Read our Ken-Rad 6SN7 Black Glass review