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Topic: help with a Nashville 112 |
Greg Johnson
From:
Greencastle, Pennsylvania, USA
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Posted 12 Jun 2016 9:30 am |
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Okay been using this amp for awhile and out of the blue the reverb starts giving me feedback, even with nothing plugged into the amp. ????? I know they are know for noise, but this sounds like feedback? Any ideas?
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MSA CLassic SD-10
92 Emmons LII
79 Super Pro
Quilter TT
Evans FET 500
Fender Twin 65 RI
American Takimine |
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chris ivey
From:
california (deceased)
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Posted 12 Jun 2016 10:33 am
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does it go away if you tilt the amp way back?
i had problems like that before.
don't remember how it got fixed. |
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Jim Park
From:
Carson City, Nv
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Posted 12 Jun 2016 1:00 pm
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| I noticed my NV1000 will squeal if it's on a hard surface like concrete. So I make sure its on a rug. |
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Greg Johnson
From:
Greencastle, Pennsylvania, USA
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Posted 12 Jun 2016 1:34 pm
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It squeals level or tilted, on stand or carpet
_________________
MSA CLassic SD-10
92 Emmons LII
79 Super Pro
Quilter TT
Evans FET 500
Fender Twin 65 RI
American Takimine |
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roger reed
From:
Indiana, USA
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Posted 12 Jun 2016 2:51 pm
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| does she still squeal with the reverb level knob turned all the way down? if so does the squeal volume change with the reverb level ? |
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Greg Johnson
From:
Greencastle, Pennsylvania, USA
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Posted 12 Jun 2016 2:59 pm
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No it doesn't squeal when reverb known is turned off. The tank seems to functioning it really rattles when bumped
_________________
MSA CLassic SD-10
92 Emmons LII
79 Super Pro
Quilter TT
Evans FET 500
Fender Twin 65 RI
American Takimine |
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roger reed
From:
Indiana, USA
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Posted 12 Jun 2016 3:04 pm
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| problem is in the reverb driver then , odds are its a leaky capacitor |
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Ken Fox
From:
Nashville GA USA
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Posted 12 Jun 2016 3:20 pm
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| I would remove the rank from the bag and verify the spring assembly is floating freely via the support springs to the reverb tank case. If not then make corrections and reinstall. |
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roger reed
From:
Indiana, USA
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Posted 12 Jun 2016 3:36 pm
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| could be a tank coil changing impedance too. I hope not those tanks can run into some money. |
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Bob Hamilton
From:
California Central Coast
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Posted 12 Jun 2016 4:01 pm 112
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| Reverb tank is too close to the speaker magnet......... |
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Lane Gray
From:
Topeka, KS
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Posted 12 Jun 2016 5:20 pm
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Tanks are thirty bucks.
_________________
2 pedal steels, a lapStrat, and an 8-string Dobro (and 3 ukes)
More amps than guitars, and not many effects |
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roger reed
From:
Indiana, USA
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Posted 12 Jun 2016 5:50 pm
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| if you can get into the tank put a finger on the springs near each end one end at a time and turn the amp on. if it is the driver oscillating into the tank you will feel the springs lightly vibrating and your touching the springs will dampen the squeal but probably wont stop it completely |
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Greg Johnson
From:
Greencastle, Pennsylvania, USA
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Posted 13 Jun 2016 4:41 am Thank You Ken Fox
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| Quote: |
| I would remove the rank from the bag and verify the spring assembly is floating freely via the support springs to the reverb tank case. If not then make corrections and reinstall. |
Ken, it must have been that speed bump. The spring assembly was totally out of line. Put it back in place and problem solved. Thanks to everyone for ideas, but Ken nailed the problem.
_________________
MSA CLassic SD-10
92 Emmons LII
79 Super Pro
Quilter TT
Evans FET 500
Fender Twin 65 RI
American Takimine |
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Ken Fox
From:
Nashville GA USA
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Posted 13 Jun 2016 5:35 am
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| Glad you found it! I saw that once before on an amp. The assembly bounced up and was resting on one the two pins that go thru the holes on the spring assembly frame. It howled liked nothing I ever heard! |
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Greg Johnson
From:
Greencastle, Pennsylvania, USA
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Posted 13 Jun 2016 5:37 am
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Ken that is how it was setting. Seriously, I hit a speed bump really hard, bounced the van to the stops. lol....
_________________
MSA CLassic SD-10
92 Emmons LII
79 Super Pro
Quilter TT
Evans FET 500
Fender Twin 65 RI
American Takimine |
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roger reed
From:
Indiana, USA
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Posted 13 Jun 2016 5:59 am
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| glad to see it is fixed. good call ken! had never seen that happen before . |
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ajm
From:
Los Angeles
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Posted 13 Jun 2016 7:18 am
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Roger Reed: "problem is in the reverb driver then , odds are its a leaky capacitor"
Please explain further.
In a Nashville 112, what is the driver?
Where is it located? |
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roger reed
From:
Indiana, USA
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Posted 13 Jun 2016 8:14 am
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| a reverb driver is the portion of an amp that takes the sound from the preamp and routs it to a circuit that increases it somewhat then sends it into a coil in the reverb tank. this causes the springs to viberate in step with the original signal.the driver in a 112 is a 8 pin op amp chip. it is designated u5 a and b . i dont have the layout paperwork so i cant tell you where it is on the board but shouldnt be to hard to find. |
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