help on changing capacitors

Can you buy those capacitors from BAT?

Hello every one I need advice...I have a balanced audio technology vk-5i preamplifier that needs to change the output capacitors they are rated 1mfd at 400vdc this use to be made by Jensen

I know they have a vague looking black line that "may" indicated they are electrolytic that would warrant changing them after >10 years, and the two would have to be back to back to make them "non polarized" which would mean you only have 1/2uF not 1uf.

But I’m not sure they are electrolytic. they may just be non polarized paralleled caps to give 2uf, and no need to change them. And there are no + or - markings on the PCB. also
https://ucarecdn.audiogon.com/d559b139-dd3a-4af1-943f-a6d63245f6c6/-/autorotate/yes/

http://oldsite.sophiaelectric.com/pages/parts/jensen/jensen_cap.htm

Cheers George

They’re not electrolytic capacitors. Because it’s a balanced circuit the output is through two output capacitors. So there are two 1uF 400V Jensen’s on the positive/negative output. (These caps appear to have a history of failure in these amps.)

The Miflex can be got here:  MIFLEX KFPM-01 Capacitor, 1.0uF 600Vdc, Copper Foil Polypropylene Film (partsconnexion.com)

Info on the caps:  http://www.miflex.com.pl/assets/dokumenty/KFPM-01-ENG.pdf (partsconnexion.com)

The key to changing out the capacitors is size.  Some caps are just to large to fit in tight spaces so be careful.  Increasing the numeric values for Power Supply capacitors will in general produces better bass so if you can fit them in, my recommendation is to do so.

I recently used the Milflex copper caps with very good results in sound reproduction - did not find them bright either.

Happy Listening.

Those look to me to be alum foil paper in oil.... I believe the miflex referenced above would be slightly better Paper in oil. Jensen still makes a copper foil, but I’m not sure its available in 1mic and I don’t think that they are paper in oil.... Either way, in general, I would prefer the copper foils. A good polystyrene would be excellent, but most likely just a hint cooler or less warm than a paper in oil. They should however be slightly more defined  Good Luck