AD15 Squealing, Please Help!

tspaceman3 · Post by **tspaceman3** » Tue Jan 20, 2009 4:40 pm

Hi,

My AD15 has begun squealing once the gain is raised beyond 12 O'clock. I have tried replacing all the valves however this does not rectify the problem. Once the gain is raised further the squeal begins to oscillate sounding like a fax machine.

I would be really grateful if anyone could advise me as to what the problem may be and how I might go about rectifying it.

Many Thanks

Bink · Post by **Bink** » Tue Jan 20, 2009 4:56 pm

Microphonic tubes would normally be the first thing to check for but if you have changed and checked the tubes it could possibly be your pickups that are causing the squeal rather than the amp itself.

Do you have another amp you can try the guitar on or equally another guitar you could try with the AD15 to see if this is the problem?

tspaceman3 · Post by **tspaceman3** » Tue Jan 20, 2009 5:07 pm

Thanks for the suggestion however I have tried several different guitars, this makes no difference, also the amp makes the same noise even when no guitar is connected (but only when something is plugged in, when no lead is inserted the amp is silent). I have another amp which is silent with the same guitars.

Drdos · Post by **Drdos** » Tue Jan 20, 2009 5:13 pm

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by tspaceman3
 (but only when something is plugged in, when no lead is inserted the amp is silent). I have another amp which is silent with the same guitars.
<hr height="1" noshade id="quote"></blockquote id="quote">Umm just curious have you used a different cable... I'm sure you have but wanted to make sure it wasn't a bad cable before thinking about your issue more.

tspaceman3 · Post by **tspaceman3** » Tue Jan 20, 2009 5:15 pm

Yeah, tried a few different cables, it is a strange one!

Jacco428 · Post by **Jacco428** » Tue Jan 20, 2009 7:26 pm

I think you need to sell it to me

tspaceman3 · Post by **tspaceman3** » Tue Jan 20, 2009 8:24 pm

It's an annoying problem but I'm not quite ready to part yet. You'll be the first to know if it drives me over the edge!

Knuckle Bones · Post by **Knuckle Bones** » Tue Jan 20, 2009 10:10 pm

Stop watching "that" scene in Deliverance while playing your guitar....squealing should stop immediately.

Taronja · Post by **Taronja** » Tue Jan 20, 2009 10:36 pm

maybe the speaker is bad,, take it to a tech, you can ruin the output tranny if you keep turning it up

Jon

a.hun · Post by **a.hun** » Wed Jan 21, 2009 2:38 pm

Tube Amplifier Debugging Page:
SQUEALS

I'd try cleaning the input jack with electrical contact cleaner. Just spray some cleaner on a jack plug and plug and unplug it as the stuff evapourates. Actually quite a good chance that'll sort you.

aNDyH.

tspaceman3 · Post by **tspaceman3** » Thu Jan 22, 2009 3:28 pm

Thanks everyone for the advice, looks like I'll be taking it to the tech. I'll let you know what they find in case anyone else encounters similar problems.

Tom

HCW · Post by **HCW** » Mon Feb 23, 2015 4:30 pm

Hi, and sorry to bump such an old thread, but I'm experiencing a similar "squealing" issue with my AD15. With the master turned close to all the way up, I can only get the gain up around 3 before it starts howling/squealing. If I turn the treble all the down I can almost get it up to 5... I've swapped all the tubes and the squeal is still there. I was wondering anyone who has also had this problem has been able to fix it and possibly share what their solution was. Many thanks for any replies.

Hubaxe · Post by **Hubaxe** » Mon Feb 23, 2015 4:44 pm

With the volume all the way up, you have to be at a reasonable distance from the amp.
That loud, squealing is not something unusual. Try to step away from the speaker, and see how it goes.

HCW · Post by **HCW** » Mon Feb 23, 2015 5:23 pm

This squealing happens with nothing plugged in to the amp input jack(happens much worse when something is plugged in). It's a very "ringy" squeal.

Les Paul Lover · Post by **Les Paul Lover** » Mon Feb 23, 2015 6:46 pm

HCW wrote:This squealing happens with nothing plugged in to the amp input jack(happens much worse when something is plugged in). It's a very "ringy" squeal.

Has it just started happening?

Does it happen if you play that amp in another building?

AD15 Squealing, Please Help!

Re: AD15 Squealing, Please Help!

Re: AD15 Squealing, Please Help!

Re: AD15 Squealing, Please Help!

Re: AD15 Squealing, Please Help!

Who is online