Head-Fi.org › Forums › Equipment Forums › Headphone Amps (full-size) › The Woo Audio 2
New Posts  All Forums:Forum Nav:

The Woo Audio 2 - Page 77

post #1141 of 1145
Quote:
Originally Posted by Behemoth27 View Post

So I got a pair of RCA 6as7g from a huge tube seller on eBay. (Over 9k feedback). Start warming them up in the woo. I get that same horrible noise as I did with the Ei ez80's. Power amp kicked into protect mode immediately. Pulled them out. Replaced with tung sol 7236. Wa2 warms up just fine. What is going?!

Did I actually damage the wa2 with those ez80's. Something that can't charge up on first power up maybe? I just doubt that I got another pair of bad tubes. Or am I really that unlucky? Is the wa2 sensitive to brand new tubes? Each of the sets was sold as NOS. I don't want to keep troubleshooting if I'm going to do damage.

Any help would be appreciated. Thanks

 

I had the same thing (see a few posts above), also with RCA tubes from the 50s. Turn out the lights and you will occasionally see a tiny flash around the lower radiator. I trashed them because they kept doing it. 

post #1142 of 1145

Behemoth

 

You definitely need to contact Woo Audio customer service on this one. Where did you purchase this? Is it still under warranty?

 

Here is the contact of the person who helped me when one of my tubes was bad when I received my WA2:  mike@wooaudio.com

 

Good Luck

post #1143 of 1145
Quote:
Originally Posted by Franatic View Post

Behemoth

You definitely need to contact Woo Audio customer service on this one. Where did you purchase this? Is it still under warranty?

Here is the contact of the person who helped me when one of my tubes was bad when I received my WA2:  mike@wooaudio.com

Good Luck

Yeah, I probably will end up contacting them. I purchased it directly from woo website. Should still be under warranty. But right now I'm thinking it should just be bad tubes. Why would it work fine with 7236's and not the 6as7g. I'm going to try and find somewhere to test tubes near me. As of right now, I'll refrain from rolling. But if I experience any more noise I'll be sending it directly to woo.
post #1144 of 1145
Fwiw I have a couple pairs of RCA 6as7g's purchased cheap off eBay as tested nos and used/testing good. Both work fine, no flashes. The seller is cjt13b.

Hopefully there is no damage to your WA2. I've spoken with a local audio store owner who told me OTL amps are less prone to being damaged by faulty tubes, but I have no idea if that is true. There are no transformer windings to worry about, but there are chokes (inductors/reactors) which I imagine could still overheat or burn up on a short circuit.

I'm not a tube or amp technician, just what I've heard. Hope you have better luck. I like the sound of the RCA tubes, I think they're a great deal for the price.
post #1145 of 1145
 Why would it work fine with 7236's and not the 6as7g. I'm going to try and find somewhere to test tubes near me. As of right now, I'll refrain from rolling. But if I experience any more noise I'll be sending it directly to woo.

In my experience, 7236s are as stable and reliable as tubes get, 5998s less so (even though I prefer them). 6as7gs try my patience.

 

Tube sellers test tubes on a machine, rather than listen to them. It's very possible for tubes to test fine and still have an audio issue.

 

I'd start with a set of tubes that you know to be good and swap one pair at a time. Give it a day or two before deciding that a pair is good.

New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Headphone Amps (full-size)
Head-Fi.org › Forums › Equipment Forums › Headphone Amps (full-size) › The Woo Audio 2