Tag Archives: tubes

Speaking of synergy

While many of my audiophile brethren have continued using their CD players during the past decade, I have not. The convenience of streaming and computer-based audio is just too compelling for me to bother with physical media other than the occasional CD rip, thus my CDs and CD player went into storage long ago. Never looked back. Well, the time has come to revisit my almost-forgotten CD player and spin some CDs. How retro.

Why after all this time? I have a musician acquaintance who is interested in hearing my system. He’s somewhat fascinated with the path I’ve taken, which is in stark contrast to his own. Being firmly in the CD camp, my friend eschews streaming services and has virtually no interest in having a computer in his system. He’d like to bring some of his favorite CDs along for our listening session so I unpacked my 15 yr. old Ah! Njoe Tjoeb 4000 and dug out some of my CDs.

The Ah! Njoe Tjoeb 4000 (pronounced “New Tube”) is a modified Marantz CD player from The Netherlands. The refinements include a tube output stage which presumably has the most significant impact on the sound. Less digital. More goodness. In keeping with the KISS principle I connected the CDP directly to my amp. 

Being a jazz fan I first grabbed a smattering of familiar old favorites .. Chet, Miles, Stan Getz, and Bill Evans. I think my jaw actually dropped. I’m FLOORED with the sound quality. Next up .. Steely Dan, Mark Knopfler, and The Doors. I can’t recall my CDs ever sounding THIS good. Please don’t misunderstand, I always enjoyed the great sound from this CD player, but this is quite a surprise. So, what’s the deal? What’s changed since this CDP was last in the mix? Well, everything .. amp, speakers, cables .. everything.

“The whole is greater than the sum of its parts.” – Aristotle 

Achieving system synergy is often an accidental affair, but not always. Thankfully, many audiophiles on this same path to audio nirvana happily share their experiences. A perfect example is the countless reports of the near “magical” synergy between Decware amps and Omega loudspeakers and from recent personal experience, I concur. Apparently, the Ah! Njoe Tjoeb 4000 is a great match as well. Synergy by accident? Yes indeed, a most happy accident.

 

A couple of old reviews can still be found on Enjoy The Music and Stereophile if you care to read more about the Ah! Njoe Tjoeb 4000.

 

 

Vacuum tubes

While I’ve had some experience with vacuum tubes in the past, it’s been extremely limited to say the least. I have a tubed CD player (Ah! Njoe Tjoeb 4000) which utilizes two 6922 tubes in the output stage and a tube/solid state hybrid integrated amp (Response Audio RAM 301) which utilizes two 12AU7 tubes for the preamp stage. As for an all tubed design, I was a complete novice when I purchased the APPJ PA0901A  integrated SET amp a year ago. This minimalist integrated has only one pair of RCA inputs and a passive volume control to attenuate the output of its tube circuit (6N4/12AX7 feeding a single 6P14/EL84 per channel).

Rolling along

It wasn’t until recently I decided it was time to try some different tubes. Why now? First and foremost, I liked the sound with the stock Chinese tubes and wanted to be completely familiar with the sound quality before swapping them out. In fact, I liked the sound enough that I didn’t bother changing the tubes before the summer heat arrived .. I like to use a cooler running amp during summer.

Over the years I’ve read countless reports of huge changes rolling tubes and, while I know there must be some truth to it, I’ve often wondered if there isn’t just a bit of hyperbole involved. Audiophiles are often prone to such exaggeration when changing anything in their systems citing massive gains in sound quality, veils being lifted, larger goosebumps, etc., etc. Color me skeptical.

So, Christmas present to self:

  • Genalex Gold Lion 12AX7
  • Mullard EL84 (matched pair)

These 3 tubes cost me just under half of what the amp sold for a year ago and was about as much as I wanted to spend. The result .. massive gain in sound quality, 7 veils were lifted, 6mm goosebumps emerged, and ..

Seriously, the APPJ PA0901A sounds like a different amp. Tone, timber, clarity, extension, soundstage, vocals .. everything changed for the better. Of course I had hoped for a result such as this but honestly, I’m somewhat flabbergasted. This isn’t a subtle change, I actually uttered “wow” during my first listening with the new tubes. To say I’m pleased is an understatement.

While APPJ has since discontinued the PA0901A in favor of it’s newer 1501A model, Tube Depot sells it’s own (re-branded?) version found here: TubeCube | 7 Stereo Vacuum Tube Amplifier. Highly recommended. And roll some tubes!

mullard el84