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Help Identify This Capacitor

C

Conmoto

New Member
The orange capacitor is used in a crossover in a pair of Mirage 360 two-way speakers (32 years old).

My goal is to replace them, so if someone could help identify, or even better, suggest a replacement, I’d be very appreciative. I don’t know what the “400 MKT” means. I assume the “.01” is the uF rating. Thanks in advance for your help!241B808D-6E12-45D7-9ECC-1629B14EA18F.jpeg41C05117-C50B-48FC-A082-5148540D917A.jpeg
 
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MKT polyester Film .01 µf @400vdc K = +/- 10 % tolerance.
 
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I wouldn't bother unless you can actually determine it's faulty. Polyester film caps last essentially forever.

Replacement would be any 0.01uF cap, preferably film. Probably won't find any rated less than a couple hundred volts due to size constraints when manufacturing -- a 50V 0.01uF film cap would be very, very tiny.
 
HPMguy said:
I wouldn't bother unless you can actually determine it's faulty. Polyester film caps last essentially forever.

Replacement would be any 0.01uF cap, preferably film. Probably won't find any rated less than a couple hundred volts due to size constraints when manufacturing -- a 50V 0.01uF film cap would be very, very tiny.
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Good to know. I just assumed because it was an older cap, that it would need to be replaced. I’m new at this. I’ll leave it alone.
 
toddalin said:
They would appear to be by-pass capacitors. If you want to improve them, there are better, but the differences may not be worth the price of admission if the rest of the system isn't up to it.

These are what I used and are a popular favorite.

https://www.parts-express.com/Audiocap-PPT-Thet
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For what it’s worth, I replaced the electrolytic caps with Mundorfs and installed Scanspeak tweeters from Madisound, based on their recommendation. I read that it’s not worth replacing the sand cast resistors. I’m all ears if there are other upgrades to consider.
 
I use those very same orange caps as replacements in my Tandberg TR2075, as eye candy (since it has an acrylic housing). Tandberg TR2075 resto attempt long term leisure project. They replace the same type and brand of mylars in it, which were "tropical fish" ones.

I fail to see any reason to use them in a loudspeaker filter, because of the low capacitance, even as a bypass.
(this apart from failing to see why replace them, but I can be accused of the very same thing myself ..........;) )
 
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Conmoto said:
For what it’s worth, I replaced the electrolytic caps with Mundorfs and installed Scanspeak tweeters from Madisound, based on their recommendation. I read that it’s not worth replacing the sand cast resistors. I’m all ears if there are other upgrades to consider.
Click to expand...

I have experimented with resistors, and while they can indeed change the sound of a crossover, it's not always for the better. In a recent crossover I tried both Jantzen MOX and Solen Anachrohmic (more expensive). The Solens only lasted a few days before I swapped back to the MOX, the Solens made the speakers thin and hard edged. Even my wife commented that she liked them better before.

As far as the 0.01 bypass caps, upgrade them if you want, but that kind of cap doesn't degrade over time like an electrolytic. If you want to change it out, go with a polypropylene film.
 
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