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Impressions: Woo Audio GES (upgraded) / Stax - Page 2

post #16 of 39
Here’s a quote from Aaron from the He1.2b thread:

“Using the Mullard and Valvo (Siemens) 12AX7's in the GES instead of the stock Tung Sol 12BZ7's has greatly improved the tonal output overall”

http://www.head-fi.org/forums/3895071-post503.html

I believe the 12BZ7’s were the upgrade tube Woo offers.

You can use 2 matched pairs to increase the number of possibilities. Trying a good vintage pair on the last stage should have the greatest effect on the sound.


Mitch
post #17 of 39
i think if you ask, Jack will include better tubes than the standard stock upon purchase - for a cost of course, but can save you some time.
post #18 of 39
When Kevin Gilmore was commenting on the prototype, he stated:

"I have listened to these units for literally thousands of hours, trying various kinds of tubes, ranging from NOS Mullard, RCA, GE and Raytheon to current-made junk. The feedback makes all these tubes sound virtually alike. Not at all like some tube preamps that sound dramatically different depending on the tube you use."

I am interested to hear from GES owners who have done some tube-rolling to see how Woo's implementation of Kevin's design responds to different tubes.
post #19 of 39
If the type of tube used in the amp made No Audible Difference why would Jack Woo offer “better tubes than the standard stock upon purchase - for a cost of course”?

Why would he offer an upgrade for the tubes if it didn’t make a difference?


Mitch
post #20 of 39
I'll ask the question again:

If the type of tube used in the amp made No Audible Difference why would Jack Woo offer “better tubes than the standard stock upon purchase - for a cost of course”?

Why would he offer an upgrade for the tubes if it didn’t make a difference?


Mitch
post #21 of 39
Quote:
Originally Posted by braillediver View Post
I'll ask the question again:

If the type of tube used in the amp made No Audible Difference why would Jack Woo offer “better tubes than the standard stock upon purchase - for a cost of course”?

Why would he offer an upgrade for the tubes if it didn’t make a difference?


Mitch
Because Jack Woo believes they do make a difference. Kevin Gilmore does not.
post #22 of 39
Quote:
Originally Posted by braillediver View Post
I'll ask the question again:

If the type of tube used in the amp made No Audible Difference why would Jack Woo offer “better tubes than the standard stock upon purchase - for a cost of course”?

Why would he offer an upgrade for the tubes if it didn’t make a difference?


Mitch
It isn't uncommon in the hi-fi world to offer upgrades that do little or nothing to better the performance just because the buyers want them. I'm certainly no accusing Woo of doing that but this isn't rare. As to whether or not better tubes matter then it depends on the circuit. A circuit with no feedback is very dependent on the quality of every component and the sound changes radically as the tubes age. Feedback stabilizes the circuit so that changes in tubes aren't as dramatic but the superior quality of the vintage tubes should still result in better sound.
post #23 of 39
Thread Starter 
@braillediver:

No one said that the upgrade offered by Jack Wu did contain any tube upgade. Please read again my first post in this thread. So apparently Jack is inline with what Kevin Gilmore states.
post #24 of 39
^^ he was referring to my post.

i'm not sure it's too controversial a statement to suggest that different tubes can yield an improvement in sound. i find it odd that people are even discussing this.
post #25 of 39
Please read the entire thread like I did before commenting?

I was commenting on this statement by Wilcox:

When Kevin Gilmore was commenting on the prototype, he stated:
"I have listened to these units for literally thousands of hours, trying various kinds of tubes, ranging from NOS Mullard, RCA, GE and Raytheon to current-made junk. The feedback makes all these tubes sound virtually alike. Not at all like some tube preamps that sound dramatically different depending on the tube you use."“

I saw 2 statements that were diametrically opposed to each other and wanted a clarification.


Mitch
post #26 of 39
nice bump to find out how the woo GES is performing with ongoing use...
post #27 of 39
I too would be interested how the amp's treating you guys in the long run? Also, has the tube rolling smoke begun to clear?
post #28 of 39
I've been in contact with Jack recently inquiring about the GES. When first asked about upgrades he informed me about the mills-ra resistors and auricap capacitor upgrades as mentioned by the OP in the first post. Only when asked specifically if he could include NOS tubes did he offer to send some 12BZ7 GE/Sylvanias at an additional cost, which seems to indicate he doesnt think it necessary.
post #29 of 39
I rolled the tubes in my upgraded GES after less than a week. I used Sylvania 12ax7wa. There was a very dramatic improvement and after 200 hours even more. I have had it for a month now and I love it.
post #30 of 39
Quote:
Originally Posted by gimmish View Post
I rolled the tubes in my upgraded GES after less than a week. I used Sylvania 12ax7wa. There was a very dramatic improvement and after 200 hours even more. I have had it for a month now and I love it.
I changed the stock EH12AX7 for some New Sensor new production Mullard 12AX7, and couldn't hear much of a difference.
At least, I doubt I'd be able to tell the difference in a blind test.

What made more of a difference was upgrading the IC's, which was immediately noticeable.
Besides that, I'm still very happy with my unit.
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