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Post by pauz21 on Jan 18, 2017 1:22:15 GMT
On another forum it was stated that the Bristol Spline is a 4 flute #76. Awesome. Thanks. I appreciate the info. Ive done one some experimenting regarding the speed issue. I roughed up the rubber on the idler wheel a bit more and for curiosity sake I put a piece of tape on the drive shaft on the motor. Tried it out and the speed increased. I think this issue may be wear on that drive shaft also. That said, once the speed issue went away it became clear the sound is really bad. Very wavy vocals and just not good quality sound. Would that be an amp issue you think? Gonna get the tubes tested and possible replace the saps but just curious if others have the same experience. Thx |
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Post by robnyc on Jan 18, 2017 2:18:04 GMT
"pauz" Regarding speed problems, Rock-ola's always need new motor grommets to make sure the motor is high enough for the shaft to fully contact the puck. A dried out puck will slip. Oil on either the puck or inner tt rim will cause sliding (clean w/alcohol or remove both and wash with a strong detergent or dish washing soap.
A neglected motor with scored or glazed bearings will run slow. With the t-t removed the motor should coast for a few seconds when power is shut off. Oiling with a light (10 wt) oil may help for a while. IIRC there are washer bearings around the t-t shaft -check to see what is there.
Bad sound: Oh boy. Where to start. The pickup is a cheap ceramic that has been subjected to heavy tracking and use. You'll need to replace that. I suggest going with a magnetic and preamp along with adding a adding a counterweight to the tonearm. That tonearm is exceptionally decent and will easily track at 2 grams when set up right.
The amp --must-- have capacitors changed and probably some resistors. The capacitor issue is critical. Leaky caps will damage the amp. That amp uses 6973 tubes. these were "last generation" power tubes and, as such, very efficient. However that made then critical with regard to grid internal spacing. They often shorted --especially if handled roughly and this has been known to kill output transformers.
Speakers: There are just two, 8" wide range speakers. I suggest connecting them to a stereo or other amp and listening for any defects such as rubbing voice coil. Do not use too much power for that test. It may be possible to add a tweeter either in front of the existing drivers or by making a hole in the baffle board. There is not much space in there.
The 1484 was one of the few machines I always wanted, but never got hold of. I like the concept of a super-compact (for it's time) machine that still offered 100 selections.
Rob-NYC
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