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Need help on replacing MKP film capacitor

post #1 of 13
Thread Starter 

So whilst rebuilding one of my EL84 push pull tube amp's, I accidentally melted half a MKP film capacitor and am in need of replacements for it.

 

One of these basically: 

 

 

 

I can't seem to find the actual rating for it by looking at the printed codes on the cap itself and google didn't return a lot of specific results.

 

The MKP cap is blue on the top side it reads:

 

100nm

338 2      MKP

 

The actual face of the cap reads:

07BC      0313

275v~      305v~

X2

 

Thanks....


Edited by DefQon - 11/22/12 at 1:57am
post #2 of 13

If you want the exact same one, It's one of these http://www.vishay.com/docs/28119/mkp3382.pdf

You should be able to get it from Element 14.

 

Value = 100nF = 0.1 uF

 

MKP = Metalised Polypropylene (capacitor type)

 

~275 is 275V AC rated (mains rating)   ~305V AC (standard rating)

X2 is the mains rating, if used on the mains side of the transformer, the correct rated capacitor must be used

mains rated capacitors may be used in other parts of the circuit, but not the other way round

 

If you don't need the exact same brand/model then you should be able to get a 100nF X2 MKP cap from jaycar, altronics, etc.


Edited by DingoSmuggler - 11/22/12 at 3:52am
post #3 of 13
Thread Starter 

Ah had a feeling it was supposed to be read 100nf not nm. 

 

Should this one be fine:

 

http://au.element14.com/vishay/f1778410m3f0w0/capacitor-class-x2-100nf-305v/dp/1413846

 

Cheers


Edited by DefQon - 11/22/12 at 4:42am
post #4 of 13

100n is the value, the M is there to indicate a 20% tolerance

 

I would expect any 100nF X2 cap should be OK, what's it doing in the circuit?

 

Also remember to match the correct lead spacing, and lead length, if that will matter for your application.

post #5 of 13
Thread Starter 

Ok, finally had time, got myself 6 Suntan TS08S 0.1uf 275v X2, 250vac MKP caps from Jaycar and replaced all the old looking Vishay one's in the amp.

 

What's funny is that all the 5 caps that I replaced all rated the same 0.1uf Vishay 3382 part number on the top side and 275v X2 rating but there was one blue cap which I also melted on the top that was the same except it had 250vac written instead of 305v like the other's although it still had 275v as you said at the start as the X2 main's rating.

 

Placebo speaking, I see most recommend either WIMA or Pilkor MKP Polypropylene caps on forums such as diyaudio etc and maybe sometimes Vishay as well for the brand/quality, will I be able to hear sound differences now that I've changed out all the old crispy looking Vishay MKP's for the new Suntan's?

 

I've ordered some Panny NHG / Nichicon KZ for power filtering/coupling and am deciding at the moment between the old Elna Red Cerafine's or Silmic ROS's (not Silmic II RFS as they don't have the rating I'm after) for the signal path and these will possibly grant me a slightly more noticeable sound change, but will going from a known audio brand name MKP cap mfr to a regular Suntan offer any special sound placebo's?

post #6 of 13

Do you know that the capacitors you quote=X2 types are for suppression circuits in mains inputs they are NOT by any stretch of the imagination Quality  Hi-Fi products. I wouldnt let them anywhere near any I have repaired or built. Those that post use exotic types are correct. These cheap types output a lot of distortion. Buy Audio quality 630VOLTS types if you want better fidelity. Dont live with those suppression types.
 

post #7 of 13

Nope.  Wima MKP's and Vishay-Roedersteins are very decent caps for audio quality.  They are functionally equivalent when it comes to audio, except one's red (Wima) and the other's blue (Roederstein).  My tastes lean toward the Wima's for bypassing electrolytics.  If they are used by themselves, the Roedersteins are probably better, IMHO.  It's correct to say that a boutique film cap is going to be better, but one enters into diminishing returns very quickly when comparing cost vs. audio quality improvement with those two particular box caps.  A good quality orange drop or Panasonic mylar is pretty good, too.  Many others are cheap as stated.  As with anything, though, it depends on the particular capacitor.

 

Just an FYI, but I am not a fan of KZ's.  I positively love Nichicon's ES's and FG's are good, too, but the KZ's I've used seem harsh and lend an "etched" sound to the music.  It's unfortunate the Elna Silmic II RFS's are not up to the voltage rating needs.  I think those things are as good as Black Gates.  It's probably a toss-up between the Cerafines or the ROS's, but the Cerafines are going to cost a lot more being out of production. 

post #8 of 13
The new Nichicon KA are great and have wide range of values. I actually prefer the blue MKP caps (Epcos, Vishay) than the Wima. All of those are great, as Tom said.
post #9 of 13
Thread Starter 

I thought the only Cerafines out of production are the older (up to 450v) caps, the lower farad and voltage rating ones still in production?

post #10 of 13
Quote:
Originally Posted by DefQon View Post

I thought the only Cerafines out of production are the older (up to 450v) caps, the lower farad and voltage rating ones still in production?

Check this out:

http://www.elna.co.jp/en/capacitor/pdf/catalog_13_14_e.pdf

 

Go to aluminum electrolytics for audio and try to find an ROA Cerafine.  They skip from ROS to ROB - the ROA is listed in their diagrams, but there is no catalog sheet for that classification of capacitor.

post #11 of 13
Thread Starter 
Quote:
Originally Posted by tomb View Post

Check this out:

http://www.elna.co.jp/en/capacitor/pdf/catalog_13_14_e.pdf

 

Go to aluminum electrolytics for audio and try to find an ROA Cerafine.  They skip from ROS to ROB - the ROA is listed in their diagrams, but there is no catalog sheet for that classification of capacitor.

True..didn't know. Either way doesn't affect me as I only use Silmic II's for signal in path places in my projects and Panny FM's or Philips BC's for power supply/decoupling etc.

post #12 of 13
Quote:
Originally Posted by DefQon View Post

True..didn't know. Either way doesn't affect me as I only use Silmic II's for signal in path places in my projects and Panny FM's or Philips BC's for power supply/decoupling etc.

 

Quote:

Originally Posted by DefQon

 

"... am deciding at the moment between the old Elna Red Cerafine's or Silmic ROS's (not Silmic II RFS as they don't have the rating I'm after) for the signal path ..."

???

post #13 of 13
Thread Starter 
Quote:
Originally Posted by tomb View Post

 

???

Well that post was made a while ago and since then from trying things in various amp's, the Silmic II's are my no.1 used cap for signal in path, but other than that if it could be avoided, the best cap is no cap.

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