Re: JU570-2 caps and fix

From: HÁRSFALVI Levente <>
Date: Wed, 22 Jul 2015 10:06:08 +0200
Message-ID: <>

On 2015-07-21 08:55, Julian Perry wrote:
> I can't see any reason why using a ceramic capacitor WOULDN'T work
> just fine (if not better - but one wonders why that wasn't done in the
> first place)

Yeah, that was also my assumption.

As for how-why that wasn't done in the first place... I think, back then 
they could only manufacture ceramics of up to some-100 nF.

> Alternatively wiring 2 identical electrolytic cpacitors anode<>anode (or Cathode<>Cathode -
> it doesn't matter which) creates a bipolar capacitor with 1/2 the
> capacitance of one of the capacitors. (IE: you'd need 2x20μF
> capacitors to create a 10μF bipolar). It's often done in speaker
> crossovers, I believe.

...Yeah. Would have been an option. Though, I'm not 100% sure. As such 
construct operates, I can't really imagine how either of the caps 
_never_ receives some small reverse polarity charge. AFAIK alu 
electrolytics do tolerate that, but tantalums generally do not. 
Tantalums also aren't generally used in analog filters so that I could 
have relied upon some confirmed-to-work solution. I didn't want to risk.

Best regards,


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