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Woo Audio WA7TP (tube power supply) Impressions Thread - Page 9

post #121 of 1110
Quote:
Originally Posted by JoelT View Post
 

 

I was listening to some of John Hopkins Immunity and had the same impression. The amp remained in complete control in even the densest of passages, many of which have very deep and textured bass. Comparatively, the SS supply can sound a bit overwhelmed and edgy. Additionally, I would add that there is absolutely no sense of harshness at the expense of greater spatial separation. In other words, nothing sounds even remotely artificial. It comes across as superbly transparent and smooth...really a wonderful presentation.  

 

BTW 3/4 volume? :eek: My eardrums would be blown back in to my skull at that level. 

 

This is via JRiver using their volume leveling turned on which cuts the volume back considerably across the board.  I use iTunes at work and the same volume setting at 9 oclock on the WA7 using iTunes is 12 using JRiver.  Cuts everything back a good 25% or more i'd say.  Really wish it did a better job of volume leveling across playlists.  It basically says 'I don't know anything about what is coming up so I will just cut everything back 25%'.

 

I am sure the amp has different characteristic curves at these higher volume knob levels needed to counteract the gain reduction of the sw leveling.  I would really prefer they offset the sw reduction per song by boosting it back as averaged across say the next 5 songs in the playlist but this is something I have argued with JRiver about in the past with to no avail.  Their argument is to just turn up the amp volume believing it doesn't affect the end sound.  This is where we disagree.  However I can't really listen to music with it turned off though, just too much fiddling with the knob every other song is a complete distraction.


Edited by groovyd - 5/9/14 at 4:28pm
post #122 of 1110
now I really regret being asleep during initial preorders. wonder how many of us have the Sylvania's. they were lauded as a good bang for buck in 12au7 threads I've read.

I'll roll in 1969s IEC labeled mullards when I get my unit.

exciting that its a clear upgrade for all who have listened.
post #123 of 1110
Sylvania tubes seems to have more spacial cues in the bass and more distinctly spaced out sound stage..

It makes me think I am going insane hearing such differences.
But I just switched back a forth time from the stock tubes, to Sylvania 5814..

I am not switching back.
Sylvania stays as I am mesmerized with every song..
post #124 of 1110
Wish i could try Mullard E80CC
post #125 of 1110

There are a few technical differences between 12au7 and 5814a

Heater current 12au7 150Ma , 5814a 175Ma this could explain the higher temp

Plate dissipation 12au7 2.75W , 5814a 3W this may boost the dynamic

post #126 of 1110
But it still should work with problems
post #127 of 1110
Quote:
Originally Posted by Dogmatrix View Post

There are a few technical differences between 12au7 and 5814a
Heater current 12au7 150Ma , 5814a 175Ma this could explain the higher temp
Plate dissipation 12au7 2.75W , 5814a 3W this may boost the dynamic
thank you for proving I am NOT insane as I herd these differences and knew nothing of these specs!

Now would you know about the Mullard E80CC..? Specs?
Edited by Maxx134 - 5/9/14 at 4:53pm
post #128 of 1110

E80CC is not recommended as a direct replacement for 12au7

Heater current is very high 300Ma and may over tax the transformer

Many other parameters are also different

post #129 of 1110
ECC82 or E82CC should also work
post #130 of 1110
And ECC802S as well
post #131 of 1110

If you really want a Mullard the CV4003/M8136 box plate are drop in replacements

post #132 of 1110

Now a handful of songs deep with the Sylvania JAN 5814A's. Very impressive. :basshead:

 

I'll put together some detailed impressions later this weekend after having more time to get a grasp on what I'm hearing. 

 

 

Quote:
Originally Posted by Maxx134 View Post


Can you verify if those Sylvania tubes make the whole unit slightly hotter?
It is not by much but it is noticeable..

I took a temp reading of the stock tubes by placing a digital thermometer next to them inside of the glass surround. I'll do the same with Sylvania's. Far from scientific, but it should give some indication if they are indeed running warmer.

post #133 of 1110

For me the WA7 tubes are running easy 3 times hotter then the WA7tp tubes which are actually quite cool.

post #134 of 1110
Quote:
Originally Posted by groovyd View Post
 

 

This is via JRiver using their volume leveling turned on which cuts the volume back considerably across the board.  I use iTunes at work and the same volume setting at 9 oclock on the WA7 using iTunes is 12 using JRiver.  Cuts everything back a good 25% or more i'd say.  Really wish it did a better job of volume leveling across playlists.  It basically says 'I don't know anything about what is coming up so I will just cut everything back 25%'.

 

I am sure the amp has different characteristic curves at these higher volume knob levels needed to counteract the gain reduction of the sw leveling.  I would really prefer they offset the sw reduction per song by boosting it back as averaged across say the next 5 songs in the playlist but this is something I have argued with JRiver about in the past with to no avail.  Their argument is to just turn up the amp volume believing it doesn't affect the end sound.  This is where we disagree.  However I can't really listen to music with it turned off though, just too much fiddling with the knob every other song is a complete distraction.

That makes sense. Considering the LCD-X is more efficient than the LCD-2 that I'm running, it struck me as a quick path to hearing loss. I don't mind turning the volume knob on the WA7. It's perfectly dampened IMO, which I derive some level of satisfaction from. The TP push button feels loose and out of sync with the volume knob...thankfully you only have to press it once and then you can forget about it. 

post #135 of 1110
Two questions. If the Wa7tp power supply opens up the soundstage significantly, how does it then fare with Senn HD800's? Also, I'm assuming that everyone is listening through the built in Woo DAC. If you're not , then please post which DAC you're using when you state your impressions. Oh, and BTW, please be sure to specify the tubes you're using when stating impressions. I don't mean to be a pain but this thread is going to be a great source of information for a lot people(myself included). I anticipate that there will also be some interesting comparisons of the WA7/tp combo and other amp/DAC combos along the way. Thanks.

Esau
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