Need help. Amp sounds like geiger counter...

[BlacknWhite]

So my band was jamming tonight and we stopped to take a break. Flipped my amp into stand by (Traynor YBA200-2). Came back and flipped the stand by switch. Started making a geiger counter ish type of noise. Still has clear sound and volume but the noise won't go away. Tried a different speaker cable. Plugged it in to a outlet in another room. Doesn't change when you adjust the volume. I had another set of pre amp tubes and swapped them just for the heck of it and no change. Anyone know what could be causing this?
@agedhorse

Here's a video of the sound

 

[BlacknWhite]

Bump

 

[byacey]

You got yourself a case of low frequency oscillation, although it's kind of odd that the timing isn't consistent. Does it occur with the master volume all the way off?

 

[BlacknWhite]

You got yourself a case of low frequency oscillation, although it's kind of odd that the timing isn't consistent. Does it occur with the master volume all the way off?

Yeah its the same. Even with the mute on

 

[byacey]

Could be a bad electrolytic cap in the power amp section, or something with the feedback loop. Does it change in any way if you flip the impedance switch?

Also, rotate the resonance control, this is directly in the feedback loop; see if that affects any change.

 

[Bim1959]

Sounds like it needs to see a tech.

 

[BlacknWhite]

No its the same no matter what I adjust (impedance switch included). Looks like I'll be making the 3 hour round trip drive to Long and Mcquade tomorrow. .... ugh... it's only a few months old....

 

[murphy]

Not the battery in your bass?

 

[BlacknWhite]

Not the battery in your bass?

Does it when there's not even a bass connected.

 

[beans-on-toast]

It could be an external influence that the amp is picking up. I would first try it somewhere else to eliminate that possibility which would narrow it down to the amp.

 

[beans-on-toast]

When it ticks, look at the power tubes and see if you are getting a flash of any kind within any of the tubes. It could be at the top or the bottom.

 

[murphy]

So my band was jamming tonight and we stopped to take a break. Flipped my amp into stand by (Traynor YBA200-2). Came back and flipped the stand by switch. Started making a geiger counter ish type of noise. Still has clear sound and volume but the noise won't go away. Tried a different speaker cable. Plugged it in to a outlet in another room. Doesn't change when you adjust the volume. I had another set of pre amp tubes and swapped them just for the heck of it and no change. Anyone know what could be causing this?
@agedhorse

Here's a video of the sound

@agedhorse would probably know what it is....

but are you able to call Traynor and ask for Tech advice?

 

[byacey]

You might try running it on tw

@agedhorse would probably know what it is....

but are you able to call Traynor and ask for Tech advice?

If it's a bad tube, you may be able to narrow it down by pulling 2 output tubes, one from each side of the push-pull arrangement, and test it for oscillation using only two output tubes, rather than four. If it still makes noise, exchange the tubes with the two you pulled and try it again. Power the amp down each time when removing or plugging in the tubes.

I've seen amps chatter from cel phone RF if the phone is in close proximity to the amp, but it usually sounds more random timing-wise and faster than your audio clip.

 

[BlacknWhite]

Thanks for all the responses guys. Its still under warranty so they are sending it off to Traynor for repairs. I'll update with their findings.

 

[donk]

was your cellphone sitting on top of it?

 

[funkytoe]

This was my thought too. Cellphone interference is definitely possible.

 

[BassmanPaul]

was your cellphone sitting on top of it?

My first thought too.

 

[BassmanPaul]

So you have already taken it in? Tomorrow we’re supposed to get a fair amount of snow!

 

[JACink]

So you have already taken it in? Tomorrow we’re supposed to get a fair amount of snow!

Will they not fix it if it is snowing?

 

[BassmanPaul]

Will they not fix it if it is snowing?

Not if they can’t get to the factory! I was thinking more of you driving through it.