Nice, vintage, genuine British made GEC made GEC and Marconi PX4 tubes, just the thing for genuine vintage British triode sound. These have straight sided glass construction, test as new, and have GEC or Marconi stickers. The price is per tube. Limited quantities available. This item is shipped from Britain, in North America or Asia please allow 2 to 3 weeks for delivery.
For more information, see data sheet : http://www.mif.pg.gda.pl/homepages/frank/sheets/126/p/PX4.pdf