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Post by thatbobguy8 on Nov 12, 2014 5:01:13 GMT -7
O.k, I have read all I can on reverb issues with the Maz 38sr head. Here is what it does. When the reverb is turned up, it has a high pitched noise similar to the sound an old t.v used to have when turned on. For those of us that could hear it. It has a brand new verb tank cause the old one died. I got the one the Doc recommended. I have cleaned all the terminals and tube sockets. I recently re tubed the amp to possibly eliminate the issue. I have tried various other tubes I have in every combo possible. JJ's with tung sol's vice versa etc. I cannot for the life of me figure out why this sounds like this. I love the sound of the verb but this drives me crazy. Any input would be greatly appreciated. Thanks. Bob
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Post by Jaguarguy (Mike) on Nov 12, 2014 7:00:54 GMT -7
Did you have the problem before your old reverb tank died? Have you tried shielding your reverb tank? Is there a cell phone close to amp? Is there a footswitch for the reverb? Sometimes having the footswitch too close acts like an antennae so you want to keep it as far as possible from amp. Hopefully we can get it resolved for you!
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Post by doctorice on Nov 12, 2014 8:21:40 GMT -7
Putting a NOS 12AT7 (ECC81) in for V3 in my MAZ 18 made a noticeable improvement. Some hiss remains but the input signal covers it completely.
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Post by thatbobguy8 on Nov 12, 2014 9:16:22 GMT -7
Yes it was there before. I actually shielded it with copper tape when I replaced it. No cell phone no foot switch. Plugged straight in no pedal board.
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Post by BritInvasion on Nov 12, 2014 12:21:12 GMT -7
I think one of the reverb tubes is a little microphonic. I have found the reverb to be very sensitive to microphonic tubes. Dime the reverb and gently tap the tubes with the eraser end of a pencil. See if one rings / whistles. Hope this helps.
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Post by Jaguarguy (Mike) on Nov 12, 2014 14:56:07 GMT -7
If you unplug reverb tank does sound still come through? Could be the cables leading to reverb tank acting as antennae. Taking them off. Cables might need to be shielded.
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Post by headshrinker (Marc) on Nov 12, 2014 16:00:07 GMT -7
You can also jumper the reverb send and return jacks with a shielded rca to rca cable and then see if the noise is still there. If so, it's likely a tube problem. If it goes away more likely a tank problem. To make sure, you have tried the amp on a different circuit in a different location in the house or wherever it is and in a different location other than the house like a neighbors. You want to eliminate something in your house wiring.
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Post by thatbobguy8 on Dec 10, 2014 6:48:58 GMT -7
Hey guys sorry for the long delay. Taking cables off noise gone. Will shield them and report back
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Post by thatbobguy8 on Dec 10, 2014 7:13:39 GMT -7
Hey guys sorry for the long delay. Taking cables off noise gone. Shielded cables still nothing. Tapped tubes and nothing. I am out of ideas
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Post by DRZ on Dec 10, 2014 9:11:19 GMT -7
Well send it in ( after the holidays of course ) we'll fix it up. Contact repairs@drzamps.com
DR.Z
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Post by zpilot on Dec 10, 2014 23:02:37 GMT -7
I'm puzzled about what you all are referring to about "shielding the cables". The cables ARE shielded.
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Post by thatbobguy8 on Dec 21, 2014 6:40:46 GMT -7
I FOUND IT! By chance I checked the rca jacks on the board again. I got a half turn out of securing nut on one. Noise gone!!!!!!!!! I feel like I hit the lottery
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Post by Jaguarguy (Mike) on Dec 21, 2014 6:53:37 GMT -7
Way to go! Had to be something simple!
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Post by digs57 on Dec 21, 2014 8:12:59 GMT -7
always nice when it turns out that simple!
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