All 6V6-GT listed here include 24 hour burn-in with the price of matched sets. All 6V6-GT include our 6 month replacement warranty. All types listed are direct replacement for 7408 used in hifi amps. 6v6gtgta7408 6V6 Tesla/JJ (Slovakia) Single New heavy duty 6V6-GT from JJ Electronic in the Slovak Republic. Price is for a Single Tube. jj6v6single$16.25 6V6 Tesla/JJ (Slovakia) Matched Pair New heavy duty 6V6-GT from JJ Electronic in the Slovak Republic. Price is for 2 tubes (matched pair). 6v6JJMP$33.95 JJ 6V6 MATCHED QUAD New heavy duty 6V6-GT from JJ Electronic in the Slovak Republic. Includes 4 tubes, (matched quad). jj6v6mq$67.90 Triode, USA For Customer Service, Questions, Shipping, Ordering, etc., M-F 9AM-4PM CT 1-800-774-3201 Email us Anytime: questions@triodestore.com TECH SUPPORT is available 4 days per week: 9 AM to 4 PM CT Monday, Tuesday, Thursday & Friday Ph 1-800-774-3201 Or email: tech@triodestore.com