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WooAudio6 SE owners - does your power component humm?.... - Page 5

post #61 of 298
9/24/08 at 3:55pm
Thread Starter 
Quote:
Originally Posted by takezo View Post
can you be more specific of the differences? just very curious...
Well, bearing in mind that this is a brand new tube and so might need more operational time to settle into its stride, the Sophia makes the sound fuller, more air between the instruments and definitely a stronger bass. Altogether a richer sound.

I really just got the cheapest tube I could find in the first guitar shop I came to in London. If the Sophia is going to be temperamental with the WA6 SE then I would like to find another rectifier tube that could give nearly the same performance.

Any recommendations?
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post #62 of 298
9/24/08 at 3:59pm
Thread Starter 
Quote:
Originally Posted by robinje View Post
I've got a maxed out 6SE.
Any hum from the transformer? I guess some do and some don't. I was told that even with two from the same batch made one after the other could result in one making a hum and the other not doing so.

I wonder if the premium parts upgrade on the maxxed SE is making a difference. The parts used are:

Blackgate voltage filter caps, 150uf/350V
Blackgate decoupling caps, 330uf/100V
Blackgate bypass caps, 220uf/16V
Blackgate bypass caps, 22uf/350V
MILLS voltage filter resistor, 3.3K/12W
KIWAME load resistor, 56K/2W
KIWAME resistor, 1K/2W

Could any of these affect the Sophia tube?
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post #63 of 298
9/24/08 at 4:00pm
Quote:
Originally Posted by sclamb View Post
...I am asking Jack for a replacement anyway as I am hoping I just got a bad sample....
smart man... i'd do the same... they must be offering warranties on these for
a good reason... i'm referring to sophia electric as well as EML brands...
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post #64 of 298
9/24/08 at 6:40pm
I'm glad I waited before I purchased one of these. Jam said from the beginning that the first cap after the rectifier was too big. I guess he's right.
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post #65 of 298
9/24/08 at 7:13pm
Thread Starter 
Quote:
Originally Posted by atbglenn View Post
I'm glad I waited before I purchased one of these. Jam said from the beginning that the first cap after the rectifier was too big. I guess he's right.
You mean the Sophia? I am waiting for Jack to respond on the situation with this tube and the circuit design on the WA6 (and the comment from Sophia Electric about the 90ma limit for this tube). It may be that the amp can be modded to work better with the Sophia (although that would mean shipping back to the US )
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post #66 of 298
9/24/08 at 7:21pm
Quote:
Originally Posted by sclamb View Post
You mean the Sophia? I am waiting for Jack to respond on the situation with this tube and the circuit design on the WA6 (and the comment from Sophia Electric about the 90ma limit for this tube). It may be that the amp can be modded to work better with the Sophia (although that would mean shipping back to the US )
Yes I meant the Sophia. Sorry for not making it clear
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post #67 of 298
9/24/08 at 9:51pm
Quote:
Originally Posted by atbglenn View Post
I'm glad I waited before I purchased one of these. Jam said from the beginning that the first cap after the rectifier was too big. I guess he's right.
it may be more complicating than that... the SE has inductors, huge ones at
that, between the rectifier and the first caps, so the size of the capacitance
shouldn't be an issue, unless the inductors are faulty or of low quality...
or it could be a faulty china-made tube...
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post #68 of 298
9/24/08 at 10:01pm
The standard 6 has a cap right after the rectifier. The SE has inductors, which I presume are right after the rectifier and if they are then it shouldn't be a problem. The draw of the amp is around 75mA's or a little less. I measured this and since it also is under 200 volts the 274B should be fine with this. It could be a defective tube. Does anyone have internal shots of the power supply on the SE?
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post #69 of 298
9/24/08 at 10:27pm

They're In...

They're in the WA6 SE thread.. (including PICs)...

http://www.head-fi.org/forums/f5/woo...59/index9.html

Page 9...
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post #70 of 298
9/24/08 at 10:59pm
Ok. But does the rectifier first go to the middle cap or directly to the inductors? There are three caps, one for each channel and then a 3rd?
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post #71 of 298
9/24/08 at 11:28pm
i believe it's a LCL setup... rectifier to one of the two inductors
and then to the 3 caps, then to the second inductor... i don't know
how they configured the 3 caps though...

having caps in front of the inductors seems to be pointless...
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post #72 of 298
9/24/08 at 11:40pm
Quote:
Originally Posted by takezo View Post
i believe it's a LCL setup... rectifier to one of the two inductors
and then to the 3 caps, then to the second inductor... i don't know
how they configured the 3 caps though...

having caps in front of the inductors seems to be pointless...
It is possible that one cap is the first cap and it is CLC but I can't tell from the image.

You can put a small cap in front of an inductor. It stabilizes the voltage from the inductor and can lower hum, which is ripple. Something like a 4uf to L (15H) to 150 or 200uf and on. I find I can get lower hum that way. Now a L right after the rectifier, provided it is enough henries, is the easiest on the rectifier or use a thermistor. Even Quicksilver Audio used a fairly large cap right after 2 6X4 rectifiers in series but after a while those fine rectifiers would arc. Mike knew about it and lower the voltage from 800 volts to 720 but it still stressed the rectifiers too much. Configuration and implementation and Mike has a very fine reputation. I installed two resistors to limit inrush current and the preamp worked much better.
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post #73 of 298
9/24/08 at 11:55pm
thanks for the insight, john.

what kind of hum would inductors sometimes put out? mechanical
or thru the headphone? i'd guess the headphone...
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post #74 of 298
9/25/08 at 12:02am
Normally inductors don't hum but the transformer does as it is stepping up or down the AC. If you get some DC on the AC, and some power lines are much worse than others, you can get some real hum from the transformer. It is a mechanical hum. There are many variables.
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post #75 of 298
9/25/08 at 12:06am
btw, i got the sophia princess today... darling wife scared me half
to death when she dropped the box handing it to me... the sly
she-devil took the tube out prior to it... anyways, how long did
you find it took for it to sound its best? the first hour for me was
uninspiring but now, after 3 hrs., it's starting to sound much more
open...
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