I'm hoping someone here is conversant in Fairchild 412 and sees this.
I bought a 412-1A with no plinth about 6 months ago. Recently I saw another one complete with plinth and figured what the heck, and bought it too. Now I have two. The first one I bought has serial no. 6484. The second one has serial no. 6684.
- SN 6484 has its original paper and film capacitor (black case, 'Mighty Mite' style). It has color bands green-blue-orange-white, which I'm pretty sure is 0.056uF 1000V. This 'table runs exactly on speed (33.33 rpm, checked with a Telarc test record).
- SN 6684 has had its bypass capacitor changed to a Sprague 'orange drop' 0.047uF (it says "473" on it). This 'table runs a little too fast.
First question: Does this capacitor value have anything at all to do with the rotational speed?
- SN 6484's platter has a channel cast into its outer circumference into which the drive belt fits. The belt is a brown fabric one. It fits very tightly in this channel and around the capstan. I guess that means it's the way it's supposed to be.
- SN 6684's platter has no channel around its outer circumference. The drive belt's tension has to keep it in place. Unfortunately, the belt the 'table came with is extremely loose. It's stretchy rubber, so I think it can't be the original belt. If I try to use a cleaning brush on a record while it's spinning, the belt falls off the platter. Obviously the belt needs to be tighter.
Question 2: Does the belt tension affect the rotational speed?
- SN 6684 has no spindle oil in the bearing. I have an old bottle of spindle oil from an AR turntable. I put 10 drops in before I slid the ball bearing in place down at the bottom of the bearing shaft.
- SN 6484 had quite a lot of oil in its bearing. It looks like some oozed out upwards, because the sponge at the top of the bearing shaft is a bit wet with oil.
Questions: Is the AR oil okay to use in the main bearing of a big old turntable like this? How much of this oil should be in the main bearing well? More than 10 drops needed?
Thanks for any info.
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I bought a 412-1A with no plinth about 6 months ago. Recently I saw another one complete with plinth and figured what the heck, and bought it too. Now I have two. The first one I bought has serial no. 6484. The second one has serial no. 6684.
- SN 6484 has its original paper and film capacitor (black case, 'Mighty Mite' style). It has color bands green-blue-orange-white, which I'm pretty sure is 0.056uF 1000V. This 'table runs exactly on speed (33.33 rpm, checked with a Telarc test record).
- SN 6684 has had its bypass capacitor changed to a Sprague 'orange drop' 0.047uF (it says "473" on it). This 'table runs a little too fast.
First question: Does this capacitor value have anything at all to do with the rotational speed?
- SN 6484's platter has a channel cast into its outer circumference into which the drive belt fits. The belt is a brown fabric one. It fits very tightly in this channel and around the capstan. I guess that means it's the way it's supposed to be.
- SN 6684's platter has no channel around its outer circumference. The drive belt's tension has to keep it in place. Unfortunately, the belt the 'table came with is extremely loose. It's stretchy rubber, so I think it can't be the original belt. If I try to use a cleaning brush on a record while it's spinning, the belt falls off the platter. Obviously the belt needs to be tighter.
Question 2: Does the belt tension affect the rotational speed?
- SN 6684 has no spindle oil in the bearing. I have an old bottle of spindle oil from an AR turntable. I put 10 drops in before I slid the ball bearing in place down at the bottom of the bearing shaft.
- SN 6484 had quite a lot of oil in its bearing. It looks like some oozed out upwards, because the sponge at the top of the bearing shaft is a bit wet with oil.
Questions: Is the AR oil okay to use in the main bearing of a big old turntable like this? How much of this oil should be in the main bearing well? More than 10 drops needed?
Thanks for any info.
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