Tung-Sol 6550
Tung-Sol 6550 - Platinum Matched
Electro-Harmonix 6550
Electro-Harmonix 6550 - Platinum Matched
Sovtek 6550WE
Sovtek 6550WE - Platinum Matched
Svetlana SV6550C
Svetlana SV6550C - Platinum Matched
Tung-Sol KT120
Tung-Sol KT120 - Platinum Matched
Mullard KT88
Mullard KT88 - Platinum Matched
Genalex Gold Lion KT88
Genalex Gold Lion KT88 - Platinum Matched