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Recent content by GrampaDave

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    anyone else running vintage Empire carts?

    If your metal cart body is touching your metal tonearm, congratulations, you've created a ground loop. Or at least enlarged the hum pickup area.
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    anyone else running vintage Empire carts?

    Unless they pick up more stock, I bought the last 242-DET for my Chunky. Thanks, Wualta. That website belongs in a museum of bad old websites. Thank you for finding it.
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    anyone else running vintage Empire carts?

    To make it 4-dimensional, you just have to own it for a while.
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    "KOSS HV High Velocity Series"

    Measurements attached, view with a constant-width font. I tried to post it in Courier New but it squashed whitespace.
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    "KOSS HV High Velocity Series"

    In 2015, when I asked Koss for replacement cushions for my HV/1A, HV/X, and Radio Shack Pro-60 (i.e. Koss HV/Pro), they sent HV/1A cushions for all three. In 2023, when I asked for HV/1A cushions, they said they were no longer available. I got good comfort and sonic results using knockoff Grado...
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    Koss HV/1LC restoration

    Not anymore. In late 2023 I asked for info, and Koss customer support said they are NLA. I asked for technical details on the foam material and they refused. I will describe my experiments and results in the "KOSS HV High Velocity Series" thread. Short answer: (1) knockoff Grado size G...
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    Sony TC-353D Rebuild Question

    Thank you for this thread, saved me starting a new one. I am cleaning a TC-353D for my neighbor, and I wondered about the auto-shutoff. The clue is that it moves at the same speed cold or hot. That says it's some kind of purpose-made damping grease like Nye Laboratories makes.
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    JICO SAS Discontinued

    That ad is in rotation with several others. Refreshing the page got me the next ad.
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    Stripping old tape

    Off-topic, since I'm talking about 7", not 10", but I felt quite clever sucking the tape into my vacuum cleaner. It took it as fast as the deck could fast-unwind it. Goodbye, spliced-up SSS!
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    Most MC like MM/MI cartridges

    Don't magnetic fields obey the principle of Superposition? If so, then (a) the fixed magnet's field affects the coils only to whatever extent moving iron bends it, and (b) the moving magnet affects the coils as if the fixed magnet was not present.
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    Technics EPC-P550 cartridge

    Should be T4P, not TP4.
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    Optonica RP-4705 Repair Notes

    Yes, that microswitch tells the logic when to stop. It's only 5V and a few mA, which is known among switch and relay makers as "dry circuit" operation. This low-power regime has its own challenges. The problem is contaminant buildup on the contacts, so they eventually quit making. I spray...
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    Optonica RP-4705 Repair Notes

    The black L-shaped plastic is called a "bell crank". It should be riding on the cam, not locking it in place. It could be misassembled in such a way that it locks. The microswitch indicates when the cam is in a particular position. When the cam starts to turn, it pushes the bell crank up...
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    Optonica RP-4705 Repair Notes

    Sorry, ceee, I can't tell what you mean by "black blocking plastic". It's been too long. Can you describe its purpose, or attach a picture? When I was getting intermittent cam operation, the root cause was high resistance in microswitch contacts that were supposed to "make". The logic...
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    JICO SAS Discontinued

    They were the same down to the last detail. I could not detect any generation loss.
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