Head-Fi.org › Forums › Equipment Forums › Headphone Amps (full-size) › Review: Woo Audio WA6 vs. WA6SE (stock units)
New Posts  All Forums:Forum Nav:

Review: Woo Audio WA6 vs. WA6SE (stock units) - Page 6

post #76 of 508
Quote:
Originally Posted by Orcin View Post
So then mixing two different brands of 6ew7 would work, but mixing a 6de7 with a 6ew7 would not work?

I agree that it looks a lot better and gives more satisfaction to see physically matched tubes. I am just wondering if there are any effects on the sound from a unmatched electrical pair from the same manufacturer. (I think you said no.)
No I would not mix a 6ew7 and a 6de7. It isn't going to hurt anything but the tubes operate at different points and sound different.
post #77 of 508
Quote:
Originally Posted by jamato8 View Post
They aren't large. The first section of the tube has a dropping resistor to the plate for the 62 volts. Instead of having the plate directly getting its energy from a resistor you put in a 150 henry or larger (hammond has a 150 henery 8mA I have used many time at 3300 ohms) and the tube now has an inductor supplying it which gives better dynamic, a cleaner sound and better transparency. The inductor give a type of current supply that is in a way, constant because as the field around the inductor collapses it continues to deliver. The inductor give a good source of current, the cap is for voltage. I do not like to resistor load tubes if I have a choice.
how small are they? 150 henry seems like a huge number...
post #78 of 508
Quote:
Originally Posted by takezo View Post
how small are they? 150 henry seems like a huge number...
Henry is the inductance but it is the mA's that will make an inductor large or small. At 8mA's the wire is very small because the current is small so the inductor is about half the size of the one you are looking at in the 6 SE.

I have noticed some changes in the sound of my 6 lately. Even more transparent and open. I like and don't like Black Gates. They take too long to form, which is why some people don't like them. Not that it matters much any longer since they are no longer made.

The Panasonic TSED series is excellent and is the way to go from now on. They cost around 5 to 6 dollars and are very fine in the power supply.
post #79 of 508
Thread Starter 
I have found that the drive/power tubes do have a nice infuence on the sound. The 6de7's have more attack and synergize better with the detailed Bendix tubes in my DAC. The 6ew7's have more decay and a wider, deeper soundstage, and they seem to compliment the WE396A in the Paradisea which exhibits these same traits. In both cases, this is with the Sophia rectifier. (I don't see any reason to roll something else into the rectifier socket - it's that good!)

This is almost like having two different systems to synergize with headphone choices or music genres. I find I prefer the 6ew7 sound and I would choose it if I was forced to pick one combination for all situations. Fortunately, I am not restricted and I can roll these various tubes for the variety.

I suspect that one could find rectifiers to support these two different signatures if a Sophia 274B was out of the price range. I know that the 5R4GYB works very well with the 6ew7's for a wide soundstage and smooth sound. I think that the 5U4G or 5AR4 might be the best match for the 6de7's, but I haven't gotten to experimenting with those yet.
post #80 of 508
I find the GE 6EW7 with the Mullard GZ30 brown base is an excellent match and close to the 274B performance.
post #81 of 508
Well, at a Colorado head-fi mini-meet today (well, Saturday) I heard what I believe was a stock WA6 with stock tubes, and it sounded very good. The differences between that one and my Maxed with PDPSU and Sophia Princess were small enough to be due to the Sophia alone. Blutarsky and I were both "snow blind in the ears" by the time that comparison rolled by, and so fatigued that everything was starting to sound the same.

Luminette had more stamina and could more easily hear the differences that late in the game, and plans to buy a Sophia as soon as money grows on trees...
post #82 of 508
Thread Starter 
I have played with several different tube combinations over the past couple of weeks. I think the choice of power tubes makes a little more difference than I originally thought.

I start with the Sophia Princess in the rectifier slot. This provides a lot of detail and soundstage for either choice of power tube.

If I roll in the 6de7's, the sound is almost solid-state in presentation. The emphahsis is on dynamics, impact, good solid bass, and less air around the notes. With 6ew7's, the amp becomes more tube-oriented. The seductive warmth is there, along with better imaging and more decay, but a bit less impact. I am using Sylvania NOS power tubes in both of these cases.

It almost like having two amps in one. These differences are less apparent to me with other rectifier tubes. Perhaps that is because the rectifier tube choice is impacting the sound in ways that I am not accustomed to and can't describe properly yet.

As I comment about these things, I must say that I am not covering new ground here. These impressions are no different from what jamato8, takezo, and HeadphoneAddict (among others) have said before about these tubes, but it is new and interesting for me to travel down this same path.

However, the different thing is the realization that the Sophia 274B combined with the Sylvania 6de7's provide a sound that is very similar to what I remember from hearing a quality solid-state amp like the GS-1. Perhaps I am imagining this similarity, but there is no doubt that the amp has more impact and less warmth with this tube combination.
post #83 of 508
Quote:
Originally Posted by HeadphoneAddict View Post
Well, at a Colorado head-fi mini-meet today (well, Saturday) I heard what I believe was a stock WA6 with stock tubes, and it sounded very good. The differences between that one and my Maxed with PDPSU and Sophia Princess were small enough to be due to the Sophia alone. Blutarsky and I were both "snow blind in the ears" by the time that comparison rolled by, and so fatigued that everything was starting to sound the same.

Luminette had more stamina and could more easily hear the differences that late in the game, and plans to buy a Sophia as soon as money grows on trees...
I can understand tired ears. The sound to me though is very, very different. I enjoyed the 6 but wasn't excited by it. The sound wasn't as dimensional and alive as I had hoped. With the power supply modification I heard the same thing that I have heard in other equipment that I have changed to this architecture. A better articulation of details, better control of dynamics and a more plausible nuanced bass. I also notice more depth and space.

Another very good capacitor and as good or better than the polar Black Gates is the Panasonic TSED series. They are great with ripple and have a nice low ESR.
post #84 of 508
Quote:
Originally Posted by Orcin View Post
I have played with several different tube combinations over the past couple of weeks. I think the choice of power tubes makes a little more difference than I originally thought.

I start with the Sophia Princess in the rectifier slot. This provides a lot of detail and soundstage for either choice of power tube.

If I roll in the 6de7's, the sound is almost solid-state in presentation. The emphahsis is on dynamics, impact, good solid bass, and less air around the notes. With 6ew7's, the amp becomes more tube-oriented. The seductive warmth is there, along with better imaging and more decay, but a bit less impact. I am using Sylvania NOS power tubes in both of these cases.

It almost like having two amps in one. These differences are less apparent to me with other rectifier tubes. Perhaps that is because the rectifier tube choice is impacting the sound in ways that I am not accustomed to and can't describe properly yet.

As I comment about these things, I must say that I am not covering new ground here. These impressions are no different from what jamato8, takezo, and HeadphoneAddict (among others) have said before about these tubes, but it is new and interesting for me to travel down this same path.

However, the different thing is the realization that the Sophia 274B combined with the Sylvania 6de7's provide a sound that is very similar to what I remember from hearing a quality solid-state amp like the GS-1. Perhaps I am imagining this similarity, but there is no doubt that the amp has more impact and less warmth with this tube combination.
The Sylvania 6DE7 are not as tubey as the RCA 6DE7 - I have both and started with the Sylvania and changed to the RCA on Jamato8's recommendation a while back.
post #85 of 508
Thread Starter 
Quote:
Originally Posted by HeadphoneAddict View Post
The Sylvania 6DE7 are not as tubey as the RCA 6DE7 - I have both and started with the Sylvania and changed to the RCA on Jamato8's recommendation a while back.

I have a pair of the RCA's from Jack that I put away early after moving to the 6EW7's. I am going to try those again tonight. It's been a while since I listened to them, and the amp & Sophia are both over 100 hours now. Things have probably changed with my setup. Lots of stuff is burning in at the same time.

Jam says to get older ones, but I can't figure out how to tell the dates. There doesn't appear to be a date code on the RCA's.
post #86 of 508
Orcin, thanks for posting your impressions here. I've been trying to decide between the WA6 and WA6SE and I think your comparison has pushed me in the direction of the SE. Unfortunately, I'm not really able to audition anything where I am but I've now got a bit of a feel for the differences between the amps. The wallet's not looking forward to this...
post #87 of 508
Go for the gusto. Enjoy those notes floating in and around your head. Escape to the land of audio nirvana and levitate your inner spirit realizing that those dollars are only a vehicle and you are on a journey.



Or not.
post #88 of 508
Thread Starter 
Quote:
Originally Posted by EtherealApril View Post
Orcin, thanks for posting your impressions here. I've been trying to decide between the WA6 and WA6SE and I think your comparison has pushed me in the direction of the SE. Unfortunately, I'm not really able to audition anything where I am but I've now got a bit of a feel for the differences between the amps. The wallet's not looking forward to this...
Sorry for your wallet, but I know you will enjoy this amp when you get it. It will be a great match for your phones. If you are not going to buy the Sophia Princess, you should at least get a few NOS tubes to roll in place of the stock tubes. Discovering the various sound changes from tube rolling is a lot of fun, and multiple tube choices for each slot will give you some options to synergize with your two different phones.



Quote:
Originally Posted by Orcin View Post
I have a pair of the RCA's from Jack that I put away early after moving to the 6EW7's. I am going to try those again tonight.

@Larry: Well, the Sylvania 6DE7's absolutely trounced the RCA's. Actually, the RCA's did not sound very good at all, so I am convinced that my RCA's must be bad. I ordered another pair of NOS RCA's last night, and I will try this again when they arrive.
post #89 of 508
Quote:
Originally Posted by Orcin View Post





@Larry: Well, the Sylvania 6DE7's absolutely trounced the RCA's. Actually, the RCA's did not sound very good at all, so I am convinced that my RCA's must be bad. I ordered another pair of NOS RCA's last night, and I will try this again when they arrive.
not necessarily... some genuine NOS tubes need burn-in to sound decent.
10-20 hrs ought to loosen them up so i'd encourage you to try them out again
later.
post #90 of 508
Thread Starter 
Quote:
Originally Posted by takezo View Post
not necessarily... some genuine NOS tubes need burn-in to sound decent.
10-20 hrs ought to loosen them up so i'd encourage you to try them out again
later.


These RCA's have 50+ hours on them, so they should have softened up by now. They sound harsh and muddy.
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Headphone Amps (full-size)
Head-Fi.org › Forums › Equipment Forums › Headphone Amps (full-size) › Review: Woo Audio WA6 vs. WA6SE (stock units)