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Modify your Woo 6. . Sophia and EML 274B . Images pages 32, 33, 34 of int. and ext. and... - Page 46

post #676 of 888
10/22/08 at 6:32am
Quote:
Originally Posted by sclamb View Post
Got another tube that doesn't hum. The Mullard GZ30 with the GE 6EW7s is making a very nice sound. Not quite as airy as the 274B but the bass is deeper for sure. I shall let it play many hours and see if things open up at all, but so far a nice combination.

Well, the soundstage with the Mullard GZ30 is pretty much 95% of that when using the 274B, maybe even a bit higher. The sense of air and space around the instruments is not quite as defined, but with the K701 it still sounds clean and the bass is very tight and controlled. A nice tube at a reasonable cost (well at least comapred to the SEP 274B). I'd say 95% of the performance for 10% of the cost.
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post #677 of 888
10/22/08 at 6:54am
Quote:
Originally Posted by sclamb View Post
Well, the soundstage with the Mullard GZ30 is pretty much 95% of that when using the 274B, maybe even a bit higher. The sense of air and space around the instruments is not quite as defined, but with the K701 it still sounds clean and the bass is very tight and controlled. A nice tube at a reasonable cost (well at least comapred to the SEP 274B). I'd say 95% of the performance for 10% of the cost.
I have one NOS -58 Mullard GZ30, is this the same?

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post #678 of 888
10/22/08 at 7:09am
Not sure if it is exactly the same, although being a GZ30 it will work.

Mine is a 5Z4 GZ30 CV2748 Mullard KB/DA Brown Base. Sadly, the tube glow is nowhere near as enticing as the 274B!
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post #679 of 888
10/22/08 at 8:12am

Where?

Quote:
Originally Posted by sclamb View Post
Well, the soundstage with the Mullard GZ30 is pretty much 95% of that when using the 274B, maybe even a bit higher. The sense of air and space around the instruments is not quite as defined, but with the K701 it still sounds clean and the bass is very tight and controlled. A nice tube at a reasonable cost (well at least comapred to the SEP 274B). I'd say 95% of the performance for 10% of the cost.
Where can you buy them for $15 (10% x $150)?
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post #680 of 888
10/22/08 at 8:16am
On eBay. I got one for $20 and one for $18.50. OK, so around 12% of the price of a SEP 274B, but still a good buy given the relative performance.
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post #681 of 888
10/22/08 at 10:41am

~ 150 hours of burn in.

My maxed WA6 is coming along very nicely - I'm really enjoying this amp. So, am I about 1/4 of the way to complete burn in? I'm using the stock output tubes and the Sophia - nice. Home system: Denon DVD 1500II (matches SQ of any $3K CDP I've heard), WA6, Senn 650s.

My office system was sounding almost as good as my home system a couple of weeks ago, but as the WA6 continues to improve, this is no longer the case. It's still a very good sound though (Vista, wav, XXHighend player, Silverstone EB01, WA3, AKG k701s). I plan on buying a good DAC for this system soon (DacMagic?), as this is the weak link.

Best,
Larry
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post #682 of 888
10/22/08 at 5:45pm
OK, I finally did the round 2 modifications. What do you think guys, did I miss something?













It's a shame that the new Mills resistors are brown instead of black. I don't like brown
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post #683 of 888
10/22/08 at 5:51pm
Thread Starter 
Yeah, too bad about the color. :^)

Looks very neat and well laid out. I would have the first dropping resistor a little back of the cap rather than right under it because it will heat the cap up as it get rid of heat. What wattage did you use? I like to use at least 5 watt and even 12 though I used the 5 watt Kiwame. I guess those are 5 watt. When did they change to brown? The 560's I would move back away from the cap some.

Nice work, how does it sound?
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post #684 of 888
10/22/08 at 6:09pm
Quote:
Originally Posted by jamato8 View Post
Yeah, too bad about the color. :^)

Looks very neat and well laid out. I would have the first dropping resistor a little back of the cap rather than right under it because it will heat the cap up as it get rid of heat. What wattage did you use? I like to use at least 5 watt and even 12 though I used the 5 watt Kiwame. I guess those are 5 watt. When did they change to brown? The 560's I would move back away from the cap some.

Nice work, how does it sound?
The first ones are 5 watt Mills. I ordered those about two months ago, and that was the first time I got brown resistors. The gap to those caps is about ½ inch, so I think it will do. I guess I was a bit afraid that those resistors would move against those transforms. Silly me, since that ain't gonna happen

Edit: I moved those resistors more away from the caps
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post #685 of 888
10/22/08 at 6:17pm
Quote:
Originally Posted by jamato8 View Post
Nice work, how does it sound?
Oh, no listening yet. Trying to find my stock tubes for the burn in. I'm gonna burn in this baby for two days, until I get my new tubes from Woo Audio.
I ordered 2 x matched pair of narrow 6EW7's and a Sophia Princess Mesh Plate 274B from Jack.

This week I have all the time, since I broke my ankle, so I have to stay home all day
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post #686 of 888
10/22/08 at 8:16pm

"The Eagle Has Landed"

Well... my maxed WA6 SE arrived today.

Set it up with the stock Sovtek rectifier, and a pair of Sylvania 6DE7s (just for burn in) and briefly tried it out with my HD580/600s, RS-1s, D5000s and AD2000s, with my Marantz SA8001 as the source.

No hum, or hiss at any volume level. No audible transformer hum. No flashes.

Just incredible sound out of any set of phones - both high and low impedance. In fact, the low impedance phones may actually sound a hair better - if I can really discern any difference. All sound amazingly simliar - and each is phenomenal. I've never heard the RS-1s, and AD2000s sound better... or... the D5000s for that matter (just as good as with the X-CANv8).

The amp has all the power you would ever want - plays very loudly at 10-11 O'clock with both high and low impedance phones.

Incredible detail and resolution throughout the audio spectrum. Spacious soundstage with all phones, with good separation and positioning. Bass is fast and tight, and extended with great texture, and the mids and highs are incredibly clear, detailed and extended. All with a very quiet background.

Quite simply the best sound I've heard out of all the amps I've tried, by a fair margin - including the Singlepower Extreme.

I've got all the good tubes to try, as it burns in, including the Princess.

But... how much better can it really get, even with the Princess, and Tung Sol 5U4GB / GBYs, and Tung Sol 6DE7s, or Raytheon 6EW7s?

Pretty amazing, really!
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post #687 of 888
10/22/08 at 9:00pm
np. Riverside - Out of Myself



Oh my, does it get even better with Sophia Mesh Plate 274B & RCA 6DE7's? I'm listening with dirt cheap Chinese tubes now
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post #688 of 888
10/22/08 at 9:03pm
Just wait till it is burned-in and you get 100 hours on the princess.
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post #689 of 888
10/22/08 at 9:14pm
Quote:
Originally Posted by HeadphoneAddict View Post
Just wait till it is burned-in and you get 100 hours on the princess.
I hope my burn-in time would be less then last time (fully maxed), since now I'm using the old V-Caps & Black Gates. I only added two more Black Gate Power Tanks + one new 22uf cap. Lets's see or hear

I hope my Sophia will arrive on Friday
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post #690 of 888
10/22/08 at 9:18pm
Thread Starter 
Give the Sophia 50 plus hours also but I pretty much enjoyed it right off.
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Head-Fi.org › Forums › Equipment Forums › Headphone Amps (full-size) › Modify your Woo 6. . Sophia and EML 274B . Images pages 32, 33, 34 of int. and ext. and discussion of the SE . . .