...wire with gain sound is bound to be a crowd favorite for many many years to come. - Headfonia.com
What I wanted to hear was a magic midrange, full, lush sound and that 3-D impact that single ended 300B amps can deliver. I wanted this sound but not the $20,000.00 price tag that goes with it! The Woo WA5 delivered. - Steve Hoffman
After long stretches of wee-hour listening without any fatigue -- that's a biggie with these cans as only those who own 'em will fully appreciate -- I can squarely say that the Woo right off cleared the biggest hurdle any K amp has to clear before I'd even consider going further. - Sranjan Ebaen at 6moons.com
I am completely blown away by the naturalness of the music, the realness of the sound. I listen to a lot of classical and jazz, especially small classical ensembles, piano, violin, cello, that type of music, and it is simply put, a fantastic sound coming from the W5. My K1000 have never sounded this smooth and enjoyable, with NO ear fatigue, no etched treble, and plenty of good clean bass. Not only do the K1000 sound great, but so do speakers on the W5! - by stax-i-nox at head-fi.org
The bass has more detail, impact, depth than I originally thought. During even complex jazz riffs the notes have a very distinct leading edge, sustain and decay.
Male and female vocals are presented with warmth and wonderful tone, Seal comes to mind with a lot of texture and impact.
The high end has an interesting dual effect going on. Sharp focus and detailed, but at the same time have a wonderful since of air about it. At first this seems like it isn't right... I guess the better thing to say is that each instrument (or notes) have a distinct location in a 3D soundstage, but within in that space the instrument (notes) have room to breath. So it is not edgy, just that balance of detail, and warmth.
All of this provides a quality that allows me to listen at lower levels, because the control, detail, and depth are higher.
I had never heard a SET amp before, but had read a lot about that SET magic and had an idea of what to expect- smooth fluid mid-range, a lot of low level detail, huge and detailed soundstage, and weak in the bass. To my delight I found the WA5 had all of these traits.
What I can say is the 274B has a very different character from the GZ34 metal base. It is far from subtle. First there is more bass - both in terms of quantity and depth. Second, the overall sound is richer, or I should say, denser across spectrum. Some people may call it "sweet" but not syrupy. Third, the far end treble is not as detailed as the GZ34 and tends to roll off earlier. Overall, it is a very different presentation from the Metal Base GZ34. - fkclo at head-fi.org
* AMP and PSU ship in a molded foam within a double-wall box
* Power supply umbilical cord is included.
* 1 pair of 300B, 6SN7, and 2 tube rectifiers are included.
* AC Power cord and RCA interconnect cables are not included.
* Shopping cart applies to the U.S. buyers only. International buyers please contact for shipping cost and payment instruction.
Parts upgrade: $1210
Premimum parts upgrade package.
(Parts upgrade are intended for amplifier purchase, not to be sold on a standalone basis.)
We carefully selected the best possible audiophile graded parts that bring the ultimate performance from the amplifier.
Power tubes upgrade 1:
Sophia Royal Princess 300B matched pair
All tubes are tested by us in an actual amplifier to meet the highest quality. $1200 with 12-month warranty
Sophia Electric applied all expertise learned from the past to this new flagship Royal Princess 300B model. It has the best virtues of both Princess mesh plate and Princess carbon plate 300B tubes and sound light-years ahead of any 300B tubes made in the history including both Sophia Electric Princess Carbon Plate 300B and Princess Mesh plate 300B tubes that won worldwide praises.
The Royal 300B's come in an exquisite wooden box. Click to see details.
Power tubes upgrade 2:
Sophia Princess 300B Mesh Plate black base matched pair. $385
Comparable to Western Electric 300B. Buy and ship independently.
The result is a 300B mesh plate tube with super clarity, low distortion and out of this world mid range fullness and liquidity. High frequency extension and sweetness is the first thing you would hear. This is a true 300B tube that is 100% interchangeable with the popular Sophia Electric globe shaped 300B mesh plate tubes and Western Electric 300B tubes, as well as current production Chinese/Russian 300B tubes (with WE 300B standard).
Driver tubes upgrade:
Hand-pick matched pair
Sylvania 6SN7GT NOS tubes
We tested these tubes in an actual amplifier to ensure the highest quality. $330 (2 pcs) with 30-day warranty.
You get a clean and dense sound image with these tubes. It is very low noise, smooth and delicate in the upper frequency range, deep and solid bass, high clarity.
Rectifier tubes replacement:
Sophia Princess Mesh Plate 274B rectifier. $320 (2 pcs) with 30-day warranty
To impact WA5's sound quality or for your super backup. Buy and ship independently.
Sophia Electric™ 274B tube is a premium rectifier tube for a 5U4/5R4/5AR4 direct replacement with 3X longer plate structure, thus it has a deeper, wider sound stage and even smoothier sound than Mullard 5AR4.