reaper
Junior Member
Posts: 61
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Post by reaper on Jan 10, 2007 9:29:10 GMT -7
My Maz is a 2x10 reverb model. What's happening is I play from low E to about low C or D I'm getting a secondary distortion apart from the amp tone. I was getting it before my tube changes, and I'm getting it less now but it is still there. It's almost like a static hiss.
V1 ANOS Sylvania, V2, Soldano tube (slightly used but good) V3 can't remember without looking at the amp Reverb Driver NOS Mullard 12AT7 V4 JJ balanced triode AX7.
I did pull the JJ out of my Marshall but it wasn't making that noise.
I'm going to mess with the tubes some more when I get home. My speakers are fine as far as I can tell too.
Thanks for the help in advance!
Luke
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Post by John on Jan 10, 2007 9:52:10 GMT -7
Do you get it with the reverb on and off? Try reverb on and off, see if there's a difference.
Have you tried a different speaker cabinet? I know you said they're fine, but give it a try.
You didn't say anything about power tubes. They cause more problems than preamp tubes. That would be the first thing I would check/change. Make sure they are balanced to each other. With a cathode biased amp, you should always have a spare set anyway.
Let us know what you find out.
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Post by billyguitar on Jan 10, 2007 12:16:12 GMT -7
Is your guitar a Strat and the pickups are too high?
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reaper
Junior Member
Posts: 61
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Post by reaper on Jan 10, 2007 14:17:43 GMT -7
Woops I forgot to talk about the Power Tubes. They are JJs and they are new too.
I don't have an 8 ohm cab unfortunately.
It makes the noise with my Strat, Tele, PRS, LP, Godin.
Luke
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Post by oldgoat on Jan 10, 2007 14:46:49 GMT -7
Ditto on checking the power tubes. And all of the tubes too, one at a time. Doesn't matter if they are new or not. Or NOS. I had a weird harmonic that was happening in my Jr where when I played an "A" it would hiss like a snare drum or a piece of metal. Even had the good Dr. scratching his head. Turned out to be a NOS Mullard. And all of the Mullards did the same thing. Swapped to a Amprex Bugle Boy and sizzle was gone. And the Mulliards were NOT bad tubes, just my Jr didn't like it.
I know my weird noise is at the opposite end of the spectrum from yours but as others have said here these are very responsive and sensitive amps. Meaning you are going to hear what you got.
Good luck and take your time.
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Post by Jim @94 Amps on Jan 10, 2007 16:53:23 GMT -7
V3 should be the 12at7 reverb driver, V4 is the recovery, and V5 is the phase inverter
I don't know if it was a typo or not, but make sure you have the preamp tubes in the right spots.
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reaper
Junior Member
Posts: 61
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Post by reaper on Jan 10, 2007 16:57:36 GMT -7
V3 should be the 12at7 reverb driver, V4 is the recovery, and V5 is the phase inverter I don't know if it was a typo or not, but make sure you have the preamp tubes in the right spots. Woops yeah typo! I had them backwards originally. That's what I get for not paying attention. Luke
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reaper
Junior Member
Posts: 61
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Post by reaper on Jan 13, 2007 12:50:11 GMT -7
Ok guys so i went back in and did some tube swapping and never could get any relief. The other thing was that it was acting like ever single tube I put in V3 was bad. Then V2 started acting microphonic.
So I pulled the chassis to make sure I didn't have a charred turret board or something and the pin sockets on V2 and V3 are super super loose. I first tried to see if they were supposed to click into place, then I tried to tighten them up but to no avail.
Have I got some worn out sockets?
Luke
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Post by John on Jan 13, 2007 17:11:49 GMT -7
You might be in need of a trip to the amp tech shop.
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reaper
Junior Member
Posts: 61
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Post by reaper on Jan 14, 2007 15:49:35 GMT -7
You might be in need of a trip to the amp tech shop. That's what I'm afraid of....which means I'll have to send my amp out-of-state because there are NO credible techs in Arkansas. Any suggestions? Luke
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Post by cacibi on Jan 15, 2007 9:19:36 GMT -7
Does it do this at higher volumes, or just when the amp is turned way down low? Sometimes if the speakers are under-powered, you can get a little buzz happening.
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Post by mikefleming on Jan 15, 2007 10:06:08 GMT -7
I used to live there, near Eureka Springs. If you are near Little Rock, you can talk to Johnny Atomic who used to run Atomic Guitars in NLR. He can probably find a good tech for you. I'll pm you his email.
Mike
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reaper
Junior Member
Posts: 61
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Post by reaper on Jan 19, 2007 15:41:32 GMT -7
Thanks for all the help guys!
I called Z on Monday and he gave me some suggestions. The most important was to plug the head into my Twin cab and see if I still get the noise. When I did that the sound disappeared. It ended up that one of the screw covers on handle was loose, add to that chassis had was loose. The tab was grounding and then un-grounding with certain sympathetic vibrations and I was hearing it through the speakers. I tightened up the chassis and the speaker noise is gone, but I still have the mechanical noise.
So I'm wondering should I glue the tab down? Should I carefully remove the grounding foil on the bottom side of the handle and tighten it up?
Luke
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