Pentode with very high slope / book value is 45 ma/V , make it very useful for audio. 8 pieces available at the time of listing with the same appearance.All items are NOS and guaranteed unless otherwise stated. Our usual tube tester is the AVO VCM163. One of the best testers in the world. We have been in the tube business since 1981. We have 1,000,000 valves in stock. LARGER QUANTITIES, IF AVAILABLE, CAN BE LISTED ON REQUEST. Our opening hours are Mon - Fri 8am - 4:30pm.