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Topic: Nashville 112 making high pitched sound... |
Joe Shelby
From:
Walnut Creek, California, USA
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Posted 29 Nov 2009 12:00 am |
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Like a test tone or something--it's loud and constant,
starts immediately after turning the amp on.
I've disconnected my steel and volume pedal from it, as
well as the preamp out/CD-in line to a mixer, and headphones from the headphone output jack.
The only thing that will make a difference is turning the master volume down. As you reduce it, so does the
high pitched sound.
Any ideas? Thanks in advance for any advice. |
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Ray Minich
From:
Bradford, Pa. Frozen Tundra
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Posted 4 Dec 2009 2:07 am
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Gotta circuit gone oscillator runnin' in there somewhere.
Does moving the amp to another location make a difference? |
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Danny Letz
From:
Old Glory,Texas, USA 79540
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Posted 4 Dec 2009 3:17 pm
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| This is similar to what my 112 does. Had it on the Forum not long back and didn't get a good answer. Mine generates a tone that osillates and the pilot light also dims and brightens. I don,t remember if turning the master does anything, but I don't think so. Unplugging the instrument does nothing to change it, nor does turning the other knobs. I can turn the amp off for a little and back on and it is ok for a while. I don't know if I would call the tone high pitched? |
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Kevin Hatton
From:
Buffalo, N.Y.
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Posted 4 Dec 2009 8:24 pm
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Deleted.
Last edited by Kevin Hatton on 5 Dec 2009 1:14 am; edited 1 time in total |
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Joe Shelby
From:
Walnut Creek, California, USA
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Posted 5 Dec 2009 12:13 am Gerbals?
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Yes, Kevin, one of my Gerbals was missing...
I found it wrapped up in the undercarriage of a '68
ZB D-11/10 with a tag around it's neck that reads "left here by Kevin Hatton to further confuse you in your misguided attempt to make your ZB play and stay in tune. Good luck, sucker!"
Anyway, I plugged the amp into another outlet, and the
high pitched sound came on for a few seconds and 'mysteriously' disappeared.
Then I turned it up and started twisting knobs. The mid-shift knob made pops and tics rotating back and forth across the 800 mark. Turned down the volume and
twisted it through its complete rotation several hundred times.
Next came the mid control, which was noisy as well.
Same fix as the mid-shift control. Those two were the noisiest. I went through the other pots and did the same procedure, though most of those were ok.
I did not use any pot cleaner or lube.
So, it's swingin' again. If the problem comes back or
some other BS, I'll post again.
BTW, packing up for a gig this pm, a 6L6 dropped out of its socket in my 135w Twin. Caught it in my right hand and returned it back to where it normally resides.
Two weeks ago, my MC 240 started blowing fuses (like immediately), and one of the transformers is making a
mechanical hum...
WTF, am I a electronic jinx or what?
happy crazy,
Joe. |
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Kevin Hatton
From:
Buffalo, N.Y.
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Posted 5 Dec 2009 12:46 am
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| Just jokin Joe. |
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Joe Shelby
From:
Walnut Creek, California, USA
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Posted 5 Dec 2009 2:15 am
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It's all right Kevin.
The Gerbals are chowin' down on hay-cob and planning to
be home come spring time...  |
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Kevin Hatton
From:
Buffalo, N.Y.
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Posted 5 Dec 2009 4:20 am
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| Glad you found the problem. |
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