Cold weather means Tube Amp season! Don't forget to retube your amp!
Svetlana SV811-3 Matched Pair
With directly heated Thoriated Tungsten filament, tri-plate anode and Titanium gettering, SV811-3 is one of the best directly heated triode for audio application.
Note: This tube cannot replace 811A. Tube may be marked SV811-3A