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4/04 2020
I have this legendary earphone years. It may not be the most sensitive earphone, but definitely a quality earphone suitable crystal radio.
I try use DYNALEC in this round crystal radio experiment, and found one of them given less volume than another. I decide try to fix it if possible.
take of the earphone cover by remove 6 screws
take off 3 more screw on back
The earphone unit now came out of its case. Before proceeding further, here is a parts list for reference.
earphone parts
Take off the part number 7(magnetic claw), 2 magnets could be take out. It suppose to be very strong, but It is weak now.
I try to re-magnetize it via a very strong magnetic I scrap from a hard driver. But no matter what I do, it's still not strong enough, and even worse than before.
I decide to replace the magnetic with a very strong magnetic which I bought almost 10 years ago.
The 2 round-magnetic is pretty much same thick compared to original magnetic.
I had to broken the magnetic into 2 pieces alone with diameter to make it fit. And it does fit well.
NOTE: the hex screw connected to vibration membrane. Make sure both top and bottom magnetic claw had suitable free space.
Most important step is make sure the number 5 and number 7 claw is not touch the vibration membrane arm (Number 10 part). Result is pretty positive, now 2 earphone have same volume. This also proof another one is on good condition.
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