Made at the Reflektor factory in Saratov, Russia. 

    Svetlana Electron Devices are a high quality Russian 

    manufacturer. Svetlana offers a wide selection of tubes for 

    both hi-end audio and guitar amplification.

 The SVETLANA 6550 offers excellent linearity and power-handling capacity with better heat dissipation. Four pillar construction and mica spacers help maintain a rugged mechanical reliability. Classic tone is maintained at a prolonged high output. A new leaded glass compound is utilised to maintain vacuum integrity, balanced performance and ensure long life.

Svetlana Website: http://www.svetlana-tubes.com