R-93 Motor Noise

[Zkeener323]

Just how much motor noise is normal with these attachment Electrolas. The rubber motor grommets are all in beautiful shape. Very soft (not sticky) and haven’t crusted over on the outside. I’m not expecting it to be nearly as quiet as my other early electric motors. However, this thing has such a strong vibrating hum that anything the record player sits on resonates as well. You have to have the music turned up uncomfortably loud to drown out the sound the motor is making mechanically. Any help is appreciated. Also, still looking for advice on a a needle set screw.

[VanEpsFan1914]

None is about right, and a little is too much. Check your governor weights & springs, the screws on them as well, and the gears & bearings on the governor assembly.

[ChuckA]

Just a few pointers on that motor from doing a few of them. First if the rubber isolators are original they are bad no matter how good they look. sometimes the vibration is from loose coils on the armature disc you can try slipping thin wood shims between the coils and the metal plate. Did you check resistance of coils? A bad/shorted coil can do that also.

The frame on these have a tendency to warp make sure you have clearance between the frame and the armature all the way around.

Chuck

[Inigo]

If the noise is clearly a hum I'm inclined to think the coils
have got loose by the years and heat, the glue turning dry and the like... I'm not an expert, though...
As they pointed out,, some careful shimming here and there could help. With paper or thin soft wood shims. Or re-tightening the coils wrapping them in electrical tape...
And the isolation rubber pegs must be completely new and very supple.

[Zkeener323]

I will have to look at the coils, I have a feeling that is it. I will look into finding something to use for replacement rubber. But truly, think the problem is elsewhere. I am assuming the resistance is ok in the coils as the motor runs at the proper speed and without flutter. This is my first time dealing with an electric motor that you have to manually give a “kick start” to make it spin, and I never would have thought to look at the coils. I’ve restored the pickup, replacing the rubber and rewound the coil in there. I use a finer gauge than was originally used on this and was able to get a coil that fit to be about 860 ohms. It’s sounds phenomenal now. I really like these electric pickups with the armature centered with the wire. The downside is the tone arm has no counterweight so I’m trying to fit a spring that isn’t visible to reduce some pressure.