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WooAudio6 SE owners - does your power component humm?.... - Page 7

post #91 of 298
Thread Starter 
I don't have such experience, but is it worth checking to see if the nut is loose? Any special precuations I need to take (other than disconnecting the power!)
post #92 of 298
Quote:
Originally Posted by atbglenn View Post
Maybe the mounting nut that holds the transformer in place is too tight, or too loose causing the mechanical hum? A slight turn in either direction may eliminate the hum ?
that could do it... or his chassis itself is subject to vibrate more than usual
at that frequency which the power transformer emits...

you'd have to use a hex wrench to open the top cover of the powersupply
unit. (the square-like dome) you should see the toroidal transformer. don't try
anything unless you're certain of what you're doing...
post #93 of 298
Thread Starter 
Is the nut on the top of the transformer and easy to see? If the power supply is disconnected, it it safe as far as danger from electrical shock is cioncerned?
post #94 of 298
if the transformer itself is loose, then you'd be hearing a lot more
than just a hum... there's a photo of the transformer in that link
in page 7, post #69. (it's in page 10 of that tread)
post #95 of 298
Picture shows transformer cover removed. The hex mounting nut in the middle can either be tightened by turning clockwise, or loosened by turning counter clockwise. BE VERY CAREFUL. Only turn in very small amounts and make sure the bolt doesn't turn along with the nut. If it does, then you will have to open the bottom cover and use a socket wrench to hold the bolt from turning. BE EXTREMELY CAREFUL NOT TO TOUCH ANYTHING THAT MAY CAUSE A SHOCK. Even though the amp is unplugged it still holds a high voltage charge in the caps. BE CAREFUL NOT TO OVER TIGHTEN THE NUT. YOU DO NOT WANT TO DAMAGE THE TRANSFORMER...

EDIT: NO BOLT IS VISIBLE FROM THE UNDERSIDE, SO THERE IS NO NEED TO TAKE BOTTOM COVER OFF

post #96 of 298
My Sophia rectifier sparks intermittently upon power-up. Sometimes it sparks, and sometimes it doesn't. Regardless, the amp works fine after intitial startup and I get no humming or other noises ever. I sent an email to Woo Audio inquiring about the sparking, but I have yet to hear back.
post #97 of 298
I should clarify... When I say spark, I mean one very brief white flash near the top of the tube, then the tube plates turn the nice orange glow as expected.
post #98 of 298
now, if anyone gets a spark or a flash upon startup with any other
rectifier than the sophia princess 274b, please let us know.

i received mine, the princess, yesterday and upon startup there was
no spark or flashing...yet.

btw, for those of you that have experienced the sparks,
how many hours do you have on your princess 274b?
post #99 of 298
You what I don't understand, A $150 Sophia only comes with a 30 day warranty when tubes purchased from other vendors usually come with 90 day warranties. I wonder why?
post #100 of 298
Quote:
Originally Posted by atbglenn View Post
You what I don't understand, A $150 Sophia only comes with a 30 day warranty when tubes purchased from other vendors usually come with 90 day warranties. I wonder why?
$$$

Princess 274B Pricing: Mesh Per Unit
Option 1 with one year warranty: $190
Option 2 with 30 days warranty: $140
post #101 of 298
You should not get any flash or white sparks on start up. This indicates that there is too much initial current draw for the tube as the caps are charging to their potential. My Sophia has never done this but then I use a 22uf cap vs a 150 or 200uf cap after the rectifier. No other tubes do this either.
post #102 of 298
Thread Starter 
Quote:
Originally Posted by robinje View Post
I should clarify... When I say spark, I mean one very brief white flash near the top of the tube, then the tube plates turn the nice orange glow as expected.
Yes, sometimes there is a white flash that travels up the mesh and then it goes orange. Sometimes however, I see some white sparks (two or three) fly and drop down through the tube. The sparks do not happen all the time. One instance is if I turn the amp off, wait 30 seconds and turn it on again - no sparks or flash. I assume the capacitor is still full and so the tube doesn't get stressed.
post #103 of 298
Thread Starter 
Quote:
Originally Posted by takezo View Post
now, if anyone gets a spark or a flash upon startup with any other
rectifier than the sophia princess 274b, please let us know.

i received mine, the princess, yesterday and upon startup there was
no spark or flashing...yet.

btw, for those of you that have experienced the sparks,
how many hours do you have on your princess 274b?
Well the Sovtek 5AR4 doesn't spark, but it does get way hotter than the Sophia!

I am sure I would have noticed the white flash and sparks from when I first got the amp but I only noticed it for the first time the day befopre yesterday. I probably have about 50 hours on the amp & Sophia tube.
post #104 of 298
Thread Starter 
Quote:
Originally Posted by jantze View Post
$$$

Princess 274B Pricing: Mesh Per Unit
Option 1 with one year warranty: $190
Option 2 with 30 days warranty: $140

I think Jack charges 150 USD for the Sophia Princess with 30-day warranty, so he is not making much out of supplying them. Although it appears he may be toasting them
post #105 of 298
Thread Starter 
Quote:
Originally Posted by robinje View Post
My Sophia rectifier sparks intermittently upon power-up. Sometimes it sparks, and sometimes it doesn't. Regardless, the amp works fine after intitial startup and I get no humming or other noises ever. I sent an email to Woo Audio inquiring about the sparking, but I have yet to hear back.

I too am waiting a reply. Please post any repsonse you get that may shed light on this.
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