Riverstone Audio - Matched Pair (2 Tubes) JAN 5654W Fully-Tested Vacuum Tubes 6J1 / 5654 /6AK5/ EF95 / 6AK5 Tube Replacement

5 Stars for a Rs.3000/- upgrade. Changed the stock tubes on my Aiyima T2 preamp. The result is awesome. To my ears the improvements are 20% warmth, treble 25% and bass 30% comparing the stock tubes(6J-?). Little bit muddy on MID but on some files only.

Excellent packing. Delivered before time. tube working fine. replace for AIYAMA T9 tube. Sound quality now very clean and crisp.

The seller delivered genuine product. I've heard the GE tubes making a huge difference and they are indeed a wow. I was blown away with the bass as well as warmth.

I always use these to replace the chinese 6J1 tubes that come with the pre-amps. There is a complete change in the sound quality with these JAN 5654 (GE) tubes: the bass is great and the trebles crisp.

Amazon is nothing but great.In my early days I handled different valves ,now this Riverstone JAN 5654W is reviving my all those memories... Enjoying true music...Thank you Amazon..

Needed a replacement for my ChiFi amplifier. Perfect replacement. Works like a charm. First, thank you seller for not exorbitantly pricing this import even when I’m guessing this is not a fast moving bulk item. Second, all attempts were made to retain the original seals and packaging. On top of it, additional packaging by was done to protect it during transport. If you’re looking for replacement valves (“tubes” for my America inspired readers,) this is the best within its specification. This would also last longer owing to its higher driving specifications than the nominal specs.

I replaced chinese 6k4 tube with Reverstone GEN 5654 valves which is comparatively good Good bass and treble which is very clear no hum Ming noise

Repond a mes attentes. Son mieux défini. Pas encore roder. Meme apres 4h d'écoute le son evolu encore. Son bcp plus stereophonique je redecouvre certain morceau avec l arriver de nouvel instrument

This alleged matched pair of 5654W vacuum tubes were my first tube purchase from Riverstone Audio. Very impressive packaging – safe, secure, and it looks like they take pride in their work. As I do not have access to a tube tester, I have to take Riverstone’s word on them being matched and on their measured performance specs. These tubes replaced the cheap Chinese crap tubes that came with my equally cheap Douk Audio T3 Plus phono/headphone preamp. The T3 Plus itself is underwhelming, but for the price that’s what I expected. However, for relatively little money, these 5654W tubes made a subtle but very noticeable improvement in sound quality in my T3 Plus. And that improvement was well worth the cost of these tubes, regardless of the following concern: HOWEVER – and I’m hoping Riverstone reads and responds to the following comment – I am a little concerned that these 5654W tubes may (or may not) have been counterfeit, or not completely advertised honestly as real GE NOS / New Old Stock tubes (actual NOS means they were manufactured many decades ago in tube’s “muscle car era” and have never been used since. Such NOS tubes command very high prices now, due to their reputation and scarcity). Here’s my concern: The green ink printed labels on the outside of each tube appear to be printed over, and on top of, other labels in light gray ink that appear to be on the inside of the tube - question mark ( ? ). Hmm. While this is unlikely to be an actual problem, our friend The Internet is full of counterfeit knock-off tubes that are “advertised” as NOS / New Old Stock but are actually modern tubes that are not manufactured to the same old-school tolerances and specifications. Similar to cheap Gucci and Louis Vitton handbags, etc. As these Riverstone 5654W’s have both green and gray printed labels, one on top of the other, it makes me doubt their true manufacturing / vintage. That said, they sound better than the tubes I replaced them with, and that’s all that really matters. In addition, a deep dive into research on GE 5654W tubes from other vendors also shows them as having the double green/gray printed labels, so at least these Riverstone’s are no worse than that competition. All that being said, for the asking price, these Riverstone 5654W’s are well worth the asking price – they simply sound better than the cheap factory installed tubes I replaced them with, and for less than the price of dinner out this evening. As this 5654W tube and its numerous compatible variants are not commonly used by tube amp/preamp manufacturers, it’s difficult to get trustworthy research on them no matter which vendor you consider. Even tube “Godfather” Brent Jessie’s website has scant info about this tube family, and Brent Jessie’s website is the most trustworthy for vacuum tube research.

Using these in a Fosi X2. They sound a bit harsh at first, but very good after about 10 hours of play time, and continue to improve with use. Mine have 50 hours now and I couldn't be more impressed with them.

Best packaging ever and a great matched pair product!! I feel like im back in the 1980s spinning my vinyl.... Awesome highs and lows sound quality.

Excelente sonido, calidad y cuerpo por el precio que tienen son los mejores.