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MTX Thunder TA421D output inductor value?
MTX Thunder TA421D output inductor value?
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Old 18th November 2019, 04:19 PM   #1
rhempz01 is offline rhempz01  United States
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Default MTX Thunder TA421D output inductor value?

So i have repaired a small MTX amplifier for someone. Everything is finished and working correctly. I need tk know the oem value of the output inductor. It has completely shorted, i can not get a reading. I will just go with the exact amount of wraps and wire gauge if no one has the information.
I used a test inductors of 80uH well 72uH by the time i could make it fit. The amplifier has full audio and seems to be working as intended.
Does anyone know the oem value i need to make the inductor?
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Old 18th November 2019, 04:20 PM   #2
rhempz01 is offline rhempz01  United States
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the oem inductor.
Just a guess, im thinking around 50-60uH
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Old 18th November 2019, 04:59 PM   #3
nigelwright7557 is offline nigelwright7557  United Kingdom
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Odd to find an inductor shorted as the wires are spread around a toroid.
It will be a short anyway at DC.
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Old 18th November 2019, 06:59 PM   #4
Perry Babin is offline Perry Babin  United States
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It's very odd that you can't get any reading. Even with the two meter probes directly shorted, you're likely to get some reading.

That inductor may have a short but it looks relatively good. A shorted turn will generally leave it with hot spots. Multiple shorted turns will typically melt the insulation before the amp fails. The insulation on this one looks relatively good except for a few areas. There doesn't appear to be anything that would result in 0 inductance.
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Old 19th November 2019, 03:51 AM   #5
rhempz01 is offline rhempz01  United States
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it had a -inductance. until i mostly unwrapped it. it melted the coating off in many spots. eventually i ended up getting a reading of 65uH. What i will do is measure out the same 16gauge of wire length and wrap it identical.
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Old 19th November 2019, 08:13 PM   #6
jkrokenberger is offline jkrokenberger  United States
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I've got one if you need it.
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Old 19th November 2019, 10:49 PM   #7
rhempz01 is offline rhempz01  United States
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jkrokenberger i pm you.
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Old 22nd November 2019, 07:34 PM   #8
rhempz01 is offline rhempz01  United States
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Can you just measure the uH of the one you have there?
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Old 22nd November 2019, 07:44 PM   #9
rhempz01 is offline rhempz01  United States
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Same lenght of wire a 3" longer, (to compensate if need be.)
The inductance is now 125uH, which i had to unwrap over 1/2 of the old wire just to finally get a reading of 69uH.
If anyone can shed some insight on this inductor for me, it would be greatly appreciated.
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Old 23rd November 2019, 12:06 AM   #10
jkrokenberger is offline jkrokenberger  United States
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I've got an inop 421D here. The supply went down and was poorly repaired at one point. I don't have an inductance tester tho.
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