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Sony ST-S555ES Secondary / Distortion Slug cracked

picked up an ST-S444ES sold as an ST-S555ES; boo.

after adjusted price i decided to keep it. it was out of adjustment, so tinkered it back to showing correct frequency when tuned. then proceeded to tinker with all adjustments for learning ๐Ÿ˜€

did it to ear / dmm measure where applicable and seemed to be more sensitive and sound MUCH better than all other tuners I have. Yay.

Just picked up a ST-S555ES and is an actual ST-S555ES; yay.

however it
doesn’t sound nearly as good, comparatively muted higher end. nothing noticeably different low end. Seems it has more distortion too.

auto seek doesnt work, just keeps seeking.

The output relay disengages at times for “no reason”

using my learnings first go, easily fixed auto seek via muting adjustment if i recall correctly (maybe it was VCO adjustment?).
somewhat sorted the output relay disengaging at odd times. still will do it but maybe a few times a day and turns back on before my brain even registered it clicked lol

so tried to adjust the secondary and did this mostly because not using proper tools ๐Ÿ™

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Am wondering about replacing the slug or perhaps the whole thing (adjustable inductor?) with this one that is in a Teac TX-100 / entry level tuner.

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Is that possible?

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