Voskhod Rocket 6J1P-EV / 6ZH1P-EV, Matched Pair

The TLDR version: This made a huge impact on the sound over the GE 5654 tubes from Riverstone and the stock Chineese ones. Improved highs and lows, more definition and details. Amazing value for the improvement.The long version- If you are reading tube reviews, there's not much to explain, so I'll go to the details. I am driving a pair of Sony SSCS5 from an Aiyima A07, connected to a cheap Succa tube headphone/preamp conected to a Fiio BTRk3 streaming from my phone. I originally was driving the Sonys with the A07 and although pretty good, it was nothing to write about. Tinkering around I decided to connect a few months ago the Succa headphone amp as a preamp, and on the way also connect the Fiio unit. Holy lord that made a difference and loved it so much I even built an eclosure as if it was all part of an integrated system. I even started OpAmp rolling to see if I could squeeze more out of the system, but honestly OpAmps did't gave me much in return. Setteled on the Todiys LM4572NA, since it gave me a bit more low end. But honestly, these are not a huge improvemnt. I decided to keep the system as it was and just enjoy it.Of course, the itch started again and decided to give this tubes a try not expecting a lot of change... WRONG. The improvement so far has been miles from anything I was expecting. Everything opened up. Separation of instruments is incredible in comparison to the GE tubes, and both highs and lows were taken to another level. The GE 5654 are good. They initially improved the bass and gave it a really plesant rounded sound the music. I guess it's that "tubey" sound people always refer to. Honestly, I really like them and was perfectly fine with them. But these Voskhod tubes not just improved the bass, it gave the music balls. Classical music now has that live grunt, basses, horns, the percussion seccion, they all now sound authorative and yet some how more defined/less vailed. Vocals that were hard to hear are now crystal clear and you can hear every single instrument. I have to admit is less warm that the GE tubes, but not in a bad way.The only issue I had a first was that the bass felt a bit too much and that the highs were a bit more piercing than before. Tinkering around I learned that now my speakers need to be about a foot extra away from the wall, and that the listening volume needed to come down a bit, since it is not nessesary to crank the music to hear detail. Pretty amaizing testament for a $40 product.I can only speak for my equipment and my set up, but these have been the single greatest improvent I have noticed in my music after the speakers. Full marks!

I just got these tonight. I had two pairs on order (I have an Ayima amp and phono preamp). I plan to give them the amp to my daughter for her dorm in September as I am getting the Infi Class AB amp this week (via Amazon of course).So, Prime managed to get one pair delivered tonight - and I was excited - so I plugged the pair into the Ayima amp which has BT 5.0. I was replacing a pair of Riverstone 5654W tubes - which were pretty solid. They were military grade replacements for the stock GJ1 Chinese made tubes which are inferior tubes.The matched pair worked immediately in the Ayima amp - 7 pin socket and the immediate LED blue lights. I was running them through a pair of Bowers and Wilkins bookshelf speakers. Put on Spotify on my IPhone and paired it on BT. Went and got to the Doors "American Prayer" and was impressed with the clean, quiet and sheer sound. Then played some Enya "Caribbean Blue" to test the soundstage. I could feel the 3D. Finally, tried some Led Zeppelin III - to check out the sound separation. The bass and drums came out clear and defined.I just have to say WOW. These are a great upgrade to most hybrid amps. If you have a stock Chinese GJ1 tube it's a no brainer. If you have a 5654 tube - and feel frustrated like I did by the low volume and small soundstage - it's a no brainer. I've recently gotten into tube roll's and yes, there are big differences between US, Chinese and Russian tubes. These are a bargain.

Very dynamic, it made my Jan 5654 tubes sound flat in comparison. Bass, deep tones are brought forward slightly and their sound stage is most certainly an improvement. Definitely worth adding to your collection!!These tubes are military versions too, they'll last longer. They did take some time to break in, but it was worth the bit of time it took.Update 6/22/25: I've done a fair amount of tube rolling since I acquired these tubes. I always come back to these tubes and have found that there is no better tube for this socket. I have a rare set of vintage Mullard M8100 blue shields made in France to vintage 1950s GE tubes(they are pretty good.) The Mullars come close, rolling off the sub bass, and they sparkle up top in the treble, mids aren't quite as lush, a bit recessed. They would be good for a different set of speakers to mach them to. These Voshkod Rockets are my end game tube- they won't fully mature until 100+ hours of listening. Mids are lush, vocals are clear, treble rolls at the top but is still very present- You can listen to music on these tubes all day long, and you'll not get fatigue. Deep bass, not too tight-not sloppy either. The sound stage is wide, secondary harmonics-Beautiful.

These tubes are high quality and sound great! I think a lot of people will like these. I ran them in for 24hrs before making an assessment. That being said the sound is more open and clear than the JAN GE tubes and Mullards. I think they lack the "tubey" sound. So I just wanted to put that out there. Perhaps you will like these perhaps you will prefer the warmer sounding GE or Mullard tubes. I think I prefer the Mullards and GE tubes more. Glad to have these anyhow.