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Review: Woo Audio WA6 vs. WA6SE (stock units) - Page 5

post #61 of 506
10/28/08 at 12:56pm
Quote:
Originally Posted by atbglenn View Post
If we ungrade, shouldn't we get some money back? ok ok! I'm a wiseguy! Like I never make typos! LOL
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post #62 of 506
10/28/08 at 1:01pm
Quote:
Originally Posted by jamato8 View Post
So where are the images of your amp?

here's a few. i should point out wooaudio has fixed the problem of the screws getting
in the way of the fat bottle 6ew7. they cut the screw tip shorter:



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post #63 of 506
10/28/08 at 1:04pm
I'm jealous. Very nice!
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post #64 of 506
10/28/08 at 1:06pm
Quote:
Originally Posted by xenithon View Post
A question still burning in my mind though, is how the WA2 would compare to the WA6 SE (for headphones use, excluding preamp functionality)?

Based on the toppologies, I would assume the WA2 has more of a warm, smooth, flowing midrange; the WA6 SE having more punch and dynamics. I believe both would handle all cans well - both high and low impedance (in particular after the change to the EZ80 in the WA2).

Has anyone heard these two, either together (e.g., at a meet) or on separate occassions?
this is just a guess, from my experience with another OTL amp the mpx3 slam se,
but the wa6 and SE have a forward mid relative to the mpx3 which is more
recessed, giving the impression of a more laid-back presentation with a deeper
soundstage...
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post #65 of 506
10/28/08 at 1:09pm
Quote:
Originally Posted by Orcin View Post
Thanks. I am now enjoying the information flow while John, takezo, and atbglenn dissect takezo's WA6SE. I am learning a lot about the design of the amp, and it's all free!





By the way... takezo, where did you get that WA6SE? Did you buy it or borrow it? If the latter, does the owner know what you are about to do to it?
free... at the risk of receiving mis-information... from me, that is...
i got it directly from jack woo... hope he hasn't noticed one missing...
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post #66 of 506
10/28/08 at 1:52pm
Yes a more recessed mid can and does give the impression of a deeper soundstage.

Has anyone thought about inductor loading the front end section rather than resistor loading it? This is something I have done for a long time and never go back to the resistor loading.
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post #67 of 506
10/28/08 at 1:57pm
Quote:
Originally Posted by takezo View Post
free... at the risk of receiving mis-information... from me, that is...
i got it directly from jack woo... hope he hasn't noticed one missing...
So what do you like more, the 6EW7 or the 6DE7? How many hours are now on the 6SE?
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post #68 of 506
10/28/08 at 1:59pm
Quote:
this is just a guess, from my experience with another OTL amp the mpx3 slam se, but the wa6 and SE have a forward mid relative to the mpx3 which is more recessed, giving the impression of a more laid-back presentation with a deeper
soundstage...
Thanks for the feedback. I wonder if the 2 may lack dynamics, which the 6 SE apparently has in spades.
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post #69 of 506
10/28/08 at 3:25pm
Quote:
Originally Posted by jamato8 View Post
So what do you like more, the 6EW7 or the 6DE7? How many hours are now on the 6SE?
i've about 200+ hrs on the 6SE... i like both... it seems to be easier to differentiate
between the two output tubes on the SE... correction, when it came back from the
latest mod from wooaudio, it had many new caps so i may be at hour 10+ now...

btw, something's happening to the modded wa6 in a good way. i'm at approx.
1200+ hrs. on the unit and the sound seems to have opened up even more now.
i've noticed it just a few days ago but the music i'm getting is better than it's
ever sounded... i really hope it stays like this for a long time...

Quote:
Originally Posted by xenithon View Post
Thanks for the feedback. I wonder if the 2 may lack dynamics, which the 6 SE apparently has in spades.
i wouldn't think the wa2 "lack" dynamics on its own... only relative to the SE
most probably... jack seems to prefer the wa2 over the 6 SE... and it's
relatively cheaper too.
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post #70 of 506
10/28/08 at 3:28pm
If you inductor load the 1 section of each tube I think you will be surprised.
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post #71 of 506
10/28/08 at 3:30pm
Thread Starter 
The drive/power tubes on the WA6SE are self-biased. Does this have any effect on the need to match tubes? Does it eliminate the need?

I have two Sylvania fat bottle 6ew7's that don't appear to be the same year because they have different logos. I don't know if they are matched but they sound fine together. Am I missing something by using these?
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post #72 of 506
10/28/08 at 3:37pm
The amp doesn't need matched tubes but I always like to have the same construction. I guess you don't mean electrically matched but physically. I prefer physically and manufacture matching but it isn't going to hurt anything if you don't.
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post #73 of 506
10/28/08 at 3:49pm
Quote:
Originally Posted by jamato8 View Post
If you inductor load the 1 section of each tube I think you will be surprised.
okay, i'll bite... please explain. the SE has so much space available in the front
section that putting two fairly large sized inductors wouldn't be a problem.
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post #74 of 506
10/28/08 at 3:53pm
Thread Starter 
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.)
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post #75 of 506
10/28/08 at 3:53pm
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.
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