Author Topic: Wurlitzer 112, harsh buzz in some of the lower notes  (Read 98 times)

Offline CharleyC

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Wurlitzer 112, harsh buzz in some of the lower notes
« on: May 18, 2020, 05:52:55 PM »
Hello All,

I have been working on a Wurlitzer 112 and have come across an issue. A few of the notes in the lower quarter have a harsh buzz and I think it is a problem with the reed bar but I am not sure, could use an expert's guidance. I just recently replaced the cracked original power cord with a new grounded three prong one, and I could have a problem with a cold solder joint or something inside the amp, but I don't think so because when the amp is disconnected from the reed bar there is just a little bit of noise. Even when the reed bar is connected there is just noise that is caused by the amp but when I play some notes it goes nuts with crazy buzz. keys 30-64 all sound great. I attached the ground of the new power cord to a screw on the inside of the chassis that is connected to the transformer. I am going to try and clean the reed bar with compressed air when I get a chance and see if it is just shorted by dust (I hope that is all it is). But could it be a problem inside the amp/ with the new power cord if only a some of the notes create the buzz?

Thanks in advance for your help


Offline OZDOC

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Re: Wurlitzer 112, harsh buzz in some of the lower notes
« Reply #1 on: May 18, 2020, 07:44:51 PM »
Hi Charley
This sort of instrument is very prone to noises caused by dust contamination between the reed and the common plate.
I think your plan of doing a thorough clean is the right place to start.
Sometimes sliding a small piece of bond paper into the reed gap can be used to clean grit from a gap.
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Offline pianotuner steveo

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Re: Wurlitzer 112, harsh buzz in some of the lower notes
« Reply #2 on: May 19, 2020, 05:30:03 AM »
I agree. Just remember, when you clean with compressed air, whether a real compressor or in cans, it temporarily adds moisture, (unless there is a water trap on the real compressor) so the noise may be worse until it evaporates.i always wear a mask when doing this. Who knows if mice have been inside, and also the cans of air have an odor, not sure what the gas is but I'm sure it's not healthy to breathe in.
1960 Wurlitzer model 700 EP
1968 Gibson G101 Combo organ
1975 Rhodes Piano Bass
1979 Wurlitzer 206A EP
1980 Wurlitzer 270 Butterfly Grand
2000 Yamaha acoustic piano
2004 Hammond XK3
2009 73A Rhodes Mark 7
2009 Korg SV-1 73
....and a few guitars...