Horn question

TJBass · #1 05-17-2010, 03:42 PM

Got a peavey tvx410 cab. When I run the Peavey Tmax head with the tube side I get a lot of metallic rattling from the horn. It works fine in solid state no matter how much I turn the horn up or no matter how hard I play, but if I engage the tube side the horn rattles.

Not constantly, only when a note is plucked and if I turn the horn down, the rattling turns down with it. As the note decays, so does the rattling.

Maybe rattling is not the right description, not really sure how to describe it.

So is it amp or horn? Anyone have this happen before? Don't have access to another cab or head to diagnose it properly.

Thanks......

mike_v_s · #2 05-17-2010, 03:47 PM

You sure just not over driving the pre? I've had tweeters that sounded like ass when anything close to dirt came out of them.

Mike

TJBass · #3 05-17-2010, 03:54 PM

No, doesn't matter where you set the pre/post gain at, still does it. I'm thinking it might be the amp, since thats the only thing that changes

KJung · #4 05-17-2010, 03:57 PM

Quote:

Originally Posted by TJBass

No, doesn't matter where you set the pre/post gain at, still does it. I'm thinking it might be the amp, since thats the only thing that changes

I would guess your tweeter is picking up something funky going on with the preamp tube (i.e., a bad tube is putting out some nasty sound in the upper treble region). Since everything sounds fine in SS mode, and since tubes tend to be the primary cause of grief in hybrid amps, that would be my guess. That's a simple fix.

billfitzmaurice · #5 05-17-2010, 05:48 PM

Quote:

Originally Posted by KJung

I would guess your tweeter is picking up something funky going on with the preamp tube (i.e., a bad tube is putting out some nasty sound in the upper treble region).

Probably a microphonic tube.

Thundar · #6 05-17-2010, 05:54 PM

Quote:

Originally Posted by KJung

I would guess your tweeter is picking up something funky going on with the preamp tube (i.e., a bad tube is putting out some nasty sound in the upper treble region). Since everything sounds fine in SS mode, and since tubes tend to be the primary cause of grief in hybrid amps, that would be my guess. That's a simple fix.

Yes, try changing out the tube...I have a TMAX and I had to change mine out because it was doing about the same thing.

TJBass · #7 05-18-2010, 11:35 AM

I'll pick one up tonight if I can get to the music store before they close.

TJBass · #8 05-18-2010, 01:41 PM

I guess I should ask, since I have never replaced one, but do you just pull the old one out and pop the new one in? Will any 12ax7 work?