replacing NP caps in audio chain ??

[mmaghakian]

I am doing some repair/ refurbishment to an SAE E101 electronic parametric crossover from the 80s


In the final stage there are NP caps in the audio chain; six 10uF/16V and six 47uF/6.3V


They are before and after three 5532 OP amps



I have never seen this before, do I need to keep them NP or is there an alternative ? Why have I not seen this before?

 

[ticknpop]

Yes keep them bipolar- lower distortion than polarized electrolytics - see Cyril Bateman’s articles if you want testing and an explanation

 

[mmaghakian]

thanks !

 

[rayma]

And you can't install them the wrong way!

 

[roger2]

Nichicon ES

Nichicon Muse ES bipolar caps measured: <-120dB THD, <-140dB IMD

 

[rayma]

Yes, or also their UES series.

 

[johnmath]

Some people say the best capacitor is no capacitor. In some circumstances coupling capacitors may be dispensed with.

 

[roger2]

I believe that ES is the same as UES. In some places the "U" is added before the "ES", other places it is not. I do not know why, but I have seen it listed both ways. It is Nichicon's audio grade bipolar electrolytic with a green sleeve. Available at Mouser and Digikey

 

[mmaghakian]

thanks to all
I will order some Muse bipolar