Riverstone Audio - 6J9P-E (6Ж9ПE / 6zh9P-E) Matched Pair (2 tubes) - Vintage Russian Vacuum Tubes - Amplitrex Tested - Replacement for 6J9, E180F, 6688 Tubes - Platinum Grade - NOS (2 Tubes) 6J9P-E

Tested AND Matched pair of 6J9P-E (6Ж9ПE / 6zh9P-E) NOS Vacuum Tubes. Our Platinum Grade 6J9P-E vacuum tubes are an excellent replacement for 9-pin Chinese 6J9 tubes. You will not find a more rigorously tested pair of vacuum tubes anywhere. To determine stability, all tubes are subjected to multiple test cycles and are matched within 6% for plate current (ip) and mutual conductance (Gm). All matched tubes are auditioned in an amplifier to determine sound quality. Fewer than 40% of the 6J9P-E tubes we test meet our high standards for audio use and are chosen for Platinum Grade pairs - we select tubes that show stability during multiple test cycles.and for low noise and for audio sound quality during final evaluation of the matched pairs in an audio amplifier. ***Please Note: To the best of our knowledge, the 6J9-E tubes we use in our Platinum Grade sets are NOS tubes.*** We guarantee that the tubes will test at NOS levels when received and back them with a no-nonsense ONE YEAR money-back warranty - THE BEST WARRANTY in the audio tube business. To protect the tubes during shipping and storage, the tubes are supplied in Riverstone Audio's custom "tube cradle" boxes. **PLEASE NOTE: 6J9P-E tubes can only be used as a direct replacement for Chinese 6J9 (these often have a "-J" or "-T" suffix) AND for Russian 6J9P / 6J49P tubes. Depending on amplifier circuit, 6J9P-E tubes may also be a suitable substitute for 6688 and EF180 tubes - DO NOT use as a replacement for other types of 9-pin tubes - AMPLIFIER DAMAGE CAN OCCUR IF YOU SUBSTITUTE THE WRONG TYPE OF TUBE. PLEASE verify the type of tube used in your amplifier (this is printed on the tube) - if in doubt contact the manufacturer of your amplifier.** IMPORTANT: IF YOU ARE LOOKING FOR REPLACEMENT TUBES FOR NOBSOUND NS-08E AMPLIFIERS - THERE ARE TWO VERSIONS OF THE NS-08E - 6J9P-E tubes WILL NOT WORK in the newest (6J3 X2) version of the Nobsound NS-08E - it uses 7-PIN 6J3 tubes.

•  ONE PAIR (2 tubes) 6J9P-E (6Ж9ПE / 6zh9P-E) NOS Vacuum Tubes. 6J9P-E is a vintage 9-pin vacuum tube that was manufactured at the Oktjabr' plant in Vinnitsa. Only the best NOS 6J9P-E tubes are selected for these matched pairs.

•  UPGRADE FOR CHINESE 6J9 TUBES – 6J9P-E tubes are a replacement for Chinese 6J9 and Russian 6J9P / 6J49P tubes. Depending on circuit, 6J9P-E tubes may also be a suitable substitute for 6688 and EF180 tubes. **PLEASE NOTE: DO NOT USE 6J9P tubes as a replacement for other types tubes - AMPLIFIER DAMAGE CAN OCCUR IF YOU SUBSTITUTE THE WRONG TYPE OF TUBE** BEFORE ORDERING VERIFY the type of tube used in your amplifier (printed on the tube) .

•  TESTED AND MATCHED by experienced engineers using Amplitrex tube testers to evaluate the electrical parameters of the tubes. Tubes are evaluated for plate current (ip), mutual conductance, tube gain, H-K leakage and noise. After matching, the tubes are evaluated for sound quality in an amplifier. If any deficiencies are found the tubes are not sold. Less than 40% of the 6J9P-E tubes we test and audition pass our standard for high fidelity audio use.

•  TEST RESULTS CLEARLY MARKED on the tube boxes with data for ip, Gm and tube gain are attached to the individual tube boxes. The tubes chosen for these matched pairs have close electrical parameter matching (ip and Gm are within 6% tubes). Individual matched pairs will have identical date codes (manufacture date codes for the 6J9P-E tubes we use range from 1970 to 1991).

•. BUY WITH CONFIDENCE - Our Platinum Grade 6J9P-E vacuum tubes are backed by a no-nonsense 1-year warranty - THE BEST WARRANTY AVAILABLE in the audio tube business. Tubes are supplied in our custom tube boxes (Riverstone Audio’s “Tube Cradle” boxes). Vacuum tubes sold by Riverstone Audio will have the "Riverstone Audio" name, logo and QC label on the shipping box.