downsouth wrote:There's a set screw on the flywheel that when adjusted seems to change the speed. Should this screw be tightened or left slightly loose?
Wes,
Recalling from memory of working on my Operas that each had an annoying flutter as opposed to yours having uneven speed, the Opera motor flywheel has a slightly elongated hole to allow the flywheel to "float" a bit on the shaft using the screw you mention. There should be a factory indentation on the shaft to seat that flywheel screw, again, as I recall. The flywheel screw should be tight on the shaft and you should be able to feel some slight "play" of the flywheel on the shaft once you tighten the screw.
I've worked on so many of my different phonograph mechanisms over the years in an effort to achieve perfection in playback and sound that my recollection above may be for a different phonograph. So please accept my apologies if you find inaccuracies in what I've stated.
One aspect I am
absolutely sure of is that the Opera flywheel balance wire that I am using - and that completely removed the
flutter (not uneven speed) on my Edison Operas as well as my Amberola 1B was suggested by Bob Barnett. That is an Ernie Ball "Custom Gauge 18P Electric or Acoustic Guitar String" sold at your local 'GUITAR CENTER' shop. Just walk in the store and ask for it. Cut it to precise length, insert it through the flywheel hole and shaft on both sides so that the Opera flywheel retainer ring can seat properly in its groove on the flywheel and try it. Again, that remedy was for flutter issues and cured it immediately on all of my phonographs with the Opera motor.
All of this stated, however, I feel that your uneven speed problem may be caused by the governor on your Opera.
If the governor has never been removed and the parts
thoroughly cleaned then the action of the friction disc may not be functioning perfectly and this will cause
exactly what you are describing - uneven speed.
You indicate that the governor appears to be running at a constant speed but I can tell you from many years of experience that I have had this exact same issue on many Edison phonographs that had uneven speed WITH a governor that appeared to run perfectly. When I removed the governor and all of its parts were cleaned and reinstalled, the speed was absolutely perfect. Again, I'm a stickler about trying to achieve perfection in playback and sound from my phonographs and thoroughly disassembling, cleaning and reinstalling the governor makes a world of difference.
Hope this helps in some way.
Doug