Svetlana 6550C Vacuum Tube - Black for sale online | eBay
Svetlana 6550C Vacuum Tube - Black for sale online | eBay,6550C Svetlana High Performance Audio Beam Power Pentode (NIB),Svetlana SV6550C,SVETLANA -S- 6550C,Svetlana 6550B-3 Pair of Tubes in Factory Packaging - The Music Room