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62.255.32.11
what is the correct anti-skate setting for records that play backwards? not backwards exactly but from the label to the outer edge of the disc? any suggestions...
Follow Ups:
As long as the tone arm geometry remains the same, it makes no difference. The skating force will be inward, so the anti-skating force should be outward. This is a result of the line tangent to the groove at the point of stylus contact not passing through the arm pivot point.Joe
Nope, the tonearm will be pushed outwards, my math is a little shaky on that, but I think the same amount of force.Some early phonos that reversed direction, such as Wurlitzer jukeboxes and the RCA Magic Brain, had this problem, and they solved it by using additional springs to counteract the outwards push.
Are you listening for satanic messages?
BTW: What turntable do you have that plays backwards? I once tried to play a stamper, and since none of my turntables allowed backwards, I ended up turning (kinda) the platter by hand.
Carsten
At any given instant of time, the stylus has very little force applied to it to follow the spiral of the groove. However, for normal tracking geometries, the tracking force results in a drag force tangent to the groove whose direction does not pass through the pivot. Thus it produces a torque. That is all that counts for producing the skating force. As seen from above, this mis-directed drag force results in a force that tends to rotate the arm clockwise around the pivot, i.e., toward the center of the record. The stylus really can't hardly even "tell" if it is tracking inward or outward on the record. Of course, if you run the record backwards, so that it is "approaching" the stylus, the drag force will be a push rather than a pull, and the skate force will be in the opposite direction. I don't believe this is what he was referring to. I believe he is referring to a record whose spiral groove starts at the center and ends at the edge. Incidentally, CDs do track from the inside out, but that doesn't have anything to do with this.Joe
Joe, just try it with a blank record (like an old victrola one sided record) and turn the turntable in reverse.C.
Please read what I wrote. I said if the record itself turned backwards, played in the reverse direction, the skating force will be reversed in direction, i.e., outward. But that is not what he was asking. He has a record that turns in the normal direction, but the groove happens to start near the label and the stylus tracks outwards, so that the side ends at the edge. In this case the anti-skating force should be applied in the normal direction.Joe
from the label out to the "run in" grooves. The concept was to counter inner groove distortion particularly since many crescendos - especially classical - are exactly in the wrong place (at the end) of the record.
"Man is the only animal that blushes - or needs to" Mark Twain
thanks for replies. I have a FEW of these cuts. never fails to catch me out - you drop the needle at the edge of the record as usual and nothing happens cos it's the end really! wonderful. no practical reason for it tho on those pressings.
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