Tag Archives: amplifier

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

Hot damn!

Well, it’s about that time of year when I simplify my system. Why? Think cool as in cool-running.  Think summer. I love the heat and I want my windows wide open. I want to smell the rain and fresh-cut grass. Yeah, I’m one of those people and honestly, I really dislike air conditioning. The only place in my home I use air conditioning is in my bedroom during those times when a fan doesn’t do the trick. Of course my friends think I’m nuts and refuse to visit me during these months (God bless their delicate constitutions). I don’t care. I’ll have plenty of time to visit with them in their lovely climate-controlled homes .. of course I’ll need a sweatshirt.

Ch-ch-changes

The most significant changes are with the amp and the DAC. First and foremost, my Fleawatt integrated will take the place of the toasty little APPJ PA0901A. This wonderful sounding class d integrated amp runs as cool or cooler than any component I’ve ever come across. Second, instead of swapping the Bifrost Multibit with another external DAC, I’ll be utilizing the Node 2’s on-board DAC. Perfect for summer! Cool.

Fanning the flames

Yes, I run a fan in my listening space when the temperature soars. I suppose this isn’t practical for critical listening sessions but is just fine for everyday enjoyment. Funny, I don’t often find myself in the mood for these critical type listening sessions anyway. No doubt my audiophile cred will suffer and my club card will revoked because of this. Bad audiophile.

Storage wars

Like many an audiophile I’ve had way too many components pass through my doors over the years. Here’s a list of gear I simply don’t want to part with. While packed away for now, each will see the light of day again at some point. Why hold onto such excess? What holds my interest? The speaker collection, for example, consists of a quasi-ribbon panel, a two-way mini monitor with an AMT tweeter, and a pseudo-omni floorstander. Each design philsophy is radically different from one another and offers a different presentation with unique strengths and weaknesses. Of course, they all sound good too. I just can’t part with them. Besides, it’s never a bad idea to have backups.

DACs

  • Chord Electronics Qute EX
  • dB Audio Labs Tranquility (Gold Level mods)
  • Schiit Bifrost Multibit

USB to SPDIF converters

  • Bel Canto mLink
  • SOtM dX-USB HD

DDCs

  • iFi SPDIF iPurifier
  • UpTone Audio USB REGEN
  • Wyred 4 Sound bLINK

Preamplifier

  • PS Audio Trio P-200

Amplifier

  • PS Audio Trio A-100

Integrated amplifiers

  • APPJ PA0901A
  • Fleawatt Audio TPA3116D2
  • Odyssey Audio Cyclops (SE+ w/ps upgrade)
  • Response Audio RAM 301

Loudspeakers

  • Magnepan MMG
  • Mark & Daniel Maximus-Ruby
  • Ohm MicroWalsh Tall

Power Supplies

  • iFi Audio iPower
  • iFi Audio iUSBPower
  • KingRex PSU MK2
  • SOtM mBPS-d2s
  • Teddy Pardo Teddy 12/2

CD Player

  • Ah! Njoe Tjoeb 4000 CDP

Miscellaneous

  • Chromecast Audio
  • Decware ZSB
  • Outlaw Audio ICBM-1

 

 

The gear

My 2-channel system has seen many changes over the years. This is what it looks like presently:

Cables

Music library

Uncompressed flac on an Oyen Digital MiniPro hard drive connected via USB to an Apple AirPort Extreme. I use wifi to stream music sources to the Node 2. 

 Head gear