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post #286 of 298
Quote:
Originally Posted by Orcin View Post
But they offered to give you the $15 retail price as compensation, and you refused.
Of course , Woo Audio should send me the rectifier valve they forgot to send ASAP , that's all . They are not serious with $15 , it does not even cover the shipping costs .

Do you really think that I should pay for their mistake ?

One has to be honest and fulfill its commitments and when I read " ... it is good to see the manufacturer take responsibility and action " it makes me laugh because I am still waiting them to take responsibility and serious action !




Quote:
Originally Posted by Parafeed View Post
Hmm. I would have hoped that he'd pay for shipping in both directions under the circumstances.
I am not the only one to be disappointed about Woo Audio behavior !
post #287 of 298
Quote:
Originally Posted by yoff View Post
They are not serious with $15 , it does not even cover the shipping costs .

If I am not mistaken, here's your stock rectifier. You're right, of course. Clearly, this is WAY more than $15.


Amazon.com: Sovtek 5AR4 Rectifier Tube: Musical Instruments
post #288 of 298
Quote:
Originally Posted by sclamb View Post
Quick question. I have the WA6 SE maxxed out version (with the Sophia 274B tube), and the power component makes a low humming sound. It is audible from a few feet away in a quiet room but not audible once the headphones are playing.

I was looking at power cords/conditioners etc, and noticed this on the IsoTek site:

______________________________

If actual pieces of equipment are buzzing this is generally one or more of the following:

Poor transformer design or construction.

Poor mechanical mounting.

Over voltage supply.

Significant distortion of the supply.

DC present on the supply.

______________________________

Do any of you other WA6 or WA6 SE owners have this low humming sound from the transformer? Could it be that I need to get a power conditioner and better power cords? In the back of my mind I am sure Jack at WooAudio said it was normal, but now I have a bee in my bonnet about it

Thanks.
Try a good AC power conditioner. Dirty power will definitely causes transformer hum, no matter how good the transformers are. DC current in the power line is the worst.

Ping
post #289 of 298
Quote:
Originally Posted by Orcin View Post
If I am not mistaken, here's your stock rectifier. You're right, of course. Clearly, this is WAY more than $15.


Amazon.com: Sovtek 5AR4 Rectifier Tube: Musical Instruments
In that case why do not they send me one , just for kidding !?
post #290 of 298

just in case you dont know

I just got an email from Jack stating that the standard 6 (NON SE)
does not need to be modified, like the SE version, to run the Sophia Princess Mesh Plate safely
post #291 of 298
Thanks for posting the info atbglenn.
post #292 of 298
So what exactly is the modification that they made to fix the WA6 SE incompatibility issue with 274B???
post #293 of 298
Quote:
Originally Posted by Orcin View Post
If I am not mistaken, here's your stock rectifier. You're right, of course. Clearly, this is WAY more than $15.


Amazon.com: Sovtek 5AR4 Rectifier Tube: Musical Instruments
It says $13 on the site.
post #294 of 298
Thread Starter 
Quote:
Originally Posted by peanuthead View Post
So what exactly is the modification that they made to fix the WA6 SE incompatibility issue with 274B???
I believe it was to use capacitors of a lower henry rating (like 4 instead of 150) to stop the current in-rush into the tube that was causing it to spark.
post #295 of 298
Quote:
Originally Posted by Parafeed View Post
Hmm. I would have hoped that he'd pay for shipping in both directions under the circumstances.
According to his website he should pay for shipping since they should be compatible without modification. If the tube and amp were ordered together then it should be covered 100 percent.

post #296 of 298
Thread Starter 
Well, I guess Jack thought that would be very expensive given that I am in the UK!
post #297 of 298

This post will revive this thread from the dead!

 

My Woo-6 (stock - stock rectifier) produces a slight audible hum upon power on (this is normal & disappears after the tubes warm up...usually within about 5 - 7 seconds).

 

A new phenomenon is an audible hum only when the volume knob is touched.  This hum responds to the volume pot - more noticeable when the pot is turned up.

 

I have a hospital grade isolation transformer, and a signal cable power cable.

 

I've only just noticed this hum since using my i-Pod connected to the Woo via an Audiophile Products LOD. (This is temporary, as I await delivery of my new Audio GD Dac.) Previously, I was using a Pico DAC via USB to my Mac Book.

 

I'm not an expert in electronics theory, however, I suspect this has something to do with ground?  Can someone please confirm this?

 

My current source (the i-Pod) is "floating", ungrounded.  Previously, the Mac book via pico was grounded at the mains by the Mac book's AC cord; although, I can't confirm if the hum was present when I was using the Mac book off of the battery only, since I no longer have a dac to do an a/b comparison.

 

When the new dac arrives, it'll be the first thing that I test!

post #298 of 298

My stock WA6SE has a very faint hum, but it is heard through the headphones.  I have checked all grounding issues, and the hum persists.  It is so faint that it does not interfere with listening to music, but I can hear it when I pause a track, or when there is no music playing.  Sometimes, with open headphones, it is difficult to hear it at all, if there are other noises coming from somewhere in my house.

 

But even when I think the hum is gone, stopping the music and then switching off the amp reveals that the hum had been there.

 

The hum is present even if everything is disconnected from the amp except headphones, the AC cord of course, and the power umbilical.  It persists with different rectifiers and power tubes as well.  It is at a constant level of very low volume, and turning the volume control up or down does not affect it in any way.  

 

I've also tried lifting the ground by using a 3-to-2 prong AC adapter, but that doesn't do anything either.  As mentioned above, it is certainly not audible when any music is playing--I love the sound of the amp and I think the hum may just be normal for this type of tube amp.

 

I have heard, though, that the hum could be caused by having DC voltage on the AC line in my house.  If this is causing the hum, connecting the amp to any outlet in any part of my home wouldn't help, would it?  And secondly, does anyone know of a good device for removing this type of hum?  Thanks for any advice anyone can give.  

 

Glad this thread is back.

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