I didn't want to start another thread but I couldn't find the one I was looking for to add to. https://www.stewmac.com/electronics/amps/tubes-valves/tube-amp-doctor-el34-svt-power-tube.html I know there were people looking for original Svets winged"C". These are relabeled for TAD but are original Svets according to the TAD website. $47.30 ea. Get 'em while they last. https://www.tubeampdoctor.com/en/el34-svt-tad-premium-matched?c=76 This TAD selection of the original Svetlana EL34 is very dependable and a recommended choice for combo amps. Somewhat lower power but nice balanced tone with fine heights, very detailed and musical mids and not too much bass. The TAD EL34-SVT is selected out of the original Svetlana-Factory production in St. Petersburg (winged -C- logo). The TAD EL34-SVT is indentical to the stock tube used by Marshall for the JCM2000 TSL/DSL series. It is the only EL34 version we do recommend to use with this amp models.