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Post by rudy18d on Feb 29, 2024 15:21:02 GMT
Greetings,
Anyone have an idea of what the optimum tonearm weight should be at the needle when the ST-39 is playing a 78? It has a diamond tip needle and a B-3 Astatic that West-Tech Services rebuilt. Nothing in the Service Manual I have mentions anything about it. Records play great but it seems heavier to me than it should be, and I don't want the customer burning through 78's too quickly. TIA
Rudy
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Post by Hildegard on Mar 3, 2024 15:30:15 GMT
Hi Rudy,
The service manual says "A crystal type pick up is used in tone-arm of ROCK-OLA phonographs. This unit has a total weight on the records of only 3-1/2 ounces, wich means longer life for both records and needles."
The manual doesn't show the cartridge but could be an Astatic B3 type.
Hildegard
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Post by jukeboxmarty on Mar 3, 2024 21:21:09 GMT
Yes, 3 1/5 ounces seems about right.
But consider this.... 3 1/5 ounces equals around 99 grams! 😲
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Post by rudy18d on Mar 7, 2024 5:59:58 GMT
Vielen dank Hildegard,von Herrn Reutelhuber (Rudy) :-)
Thank you Marty, 99 grams!! Oh my, no wonder it wouldn't register on either of my tonearm scales. Thanks again to you both!
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Post by Hildegard on Mar 9, 2024 15:55:51 GMT
Hallo Herr Reuthelhuber,
wie schön hier auch deutsch zu lesen. :-)
I will continue in English so Non-German speakers can understand as well.
I agree with Marty to consider about using the original setup. Even though the manual mentions longer life for records - this was said in the late 1930s.
Today 78 rpm records can be found, but I would not play them with such a high tone arm weight. They wear and then it can be difficult to find the exact replacement.
Maybe replacing with a more modern ceramic cartridge which plays with 8 - 10 g is the better option. Even though it is not orignal.
Hildegard
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