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WA3 High pitch whine

post #1 of 7
12/4/11 at 9:11am
Thread Starter 

Hi All,

 

I have a WA3, and it has started making a high pitch whine. It is audible without the headphones on, very very high frequency (if I wasn't in my 20s I wouldn't hear it). A similar frequency noise happens in the headphones too, on and off.

 

Changed the tubes, still the same. At first I thought it was the tubes because if I lightly tap the 6080 tube (a 5998) it stops, but then comes back. Moving the volume knob doesn't affect the annoying noise, music masks it but it comes through in the silence at constant volume regardless of volume knob position.

 

It is quite intermittent but noticed it getting more frequent.

 

Any ideas? I can put up with it, but would rather not :P

 

Cheers!

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post #2 of 7
12/4/11 at 9:19am
Thread Starter 

It should also be noted that a short time ago, I got a dodgy 5998 tube that killed the preamp pair too. Hopefully it didn't cause amp damage?

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post #3 of 7
12/4/11 at 9:38am

I would send it back for repair. tube failures can cause amps to do very weird things. 

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post #4 of 7
12/4/11 at 9:41am
Thread Starter 

Awwww don't say that! Im in the UK and shipping a Woo will be expensive :(
 

Quote:
Originally Posted by nikongod View Post

I would send it back for repair. tube failures can cause amps to do very weird things. 



 

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post #5 of 7
12/4/11 at 12:39pm

so its the actual amp making the noise not the headphones?

 

because i've had whine or hum before but was always a microphonic tube.

 

was the 5998 a tung sol? was there anything visibly wrong with it?

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post #6 of 7
12/4/11 at 12:47pm
Thread Starter 

Well a TS 5998 was faulty and took out the preamps (http://www.head-fi.org/forum/newestpost/580413) the 5998 had a rotating base ... that went in the bin along with the damaged preamps.

 

I then tried another TS 5998 and a pair of Brimar CV2492s, which had the noise ... then I swapped them out for yet another 5998 and another set of Brimar CV2492 . Same noise. The noise seemed to be coming from the amp itself and through the headphones ... though I am trying to eliminate local interference from power-saving bulbs, my computer screens (the amp is on the desk with me).

 

Then I popped in a 6AS7G with non-Brimar preamps and that seems to have now cured it ... so maybe it was the combo of the TS 5998 and the Brimars? (seeing as I tried 2 unique sets of that combination) ... Which would be a crying shame because apart from the whine, they were lovely together ...

 

Im gonna run it for a while, see if it comes back.

 


 

Quote:
Originally Posted by Rawrbington View Post

so its the actual amp making the noise not the headphones?

 

because i've had whine or hum before but was always a microphonic tube.

 

was the 5998 a tung sol? was there anything visibly wrong with it?



 


Edited by volted - 12/4/11 at 12:52pm
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post #7 of 7
12/4/11 at 2:47pm

hmm.

i hope it works out.  let us know how it goes.

 

i think sometimes tubes can just be strange beasts.  but they sure do sound nice

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