If those are cracked, I guess I wold replace them.
They likely will not fix the hum but should not be left if cracked.
Gary
Sent from my iPad
> On Jun 2, 2017, at 11:23 PM, Josh Gibbs <gibbsjj@gmail.com> wrote:
>
> This kind of capacitor:
>
> http://s337.photobucket.com/user/jusepics/media/Tropical_Fish_Color_Chart.png.html
> http://www.electrojumble.org/TropFish_a.jpg
>
> From my research, its a polyester film type. I noticed a couple of them are
> cracked. Think its worth replacing them?
>
> I'm about to try shielding the transformer with some thin steel sheet I
> have on hand.
>
> -Josh
>
>> On Fri, Jun 2, 2017 at 9:04 PM, Gary F <dukeshifi@comcast.net> wrote:
>>
>> Josh, I don't know what you mean by tropical fish capacitors but some
>> capacitors are quite sensitive to noise pickup, as you describe, especially
>> in high gain audio circuits like this one. This is the reason why some
>> early capacitor designs were supposed to be installed in a preferential
>> direction-not because they were polarized but because they were fabricated
>> in such a way that the last layer of the cap acted as a shield for the rest
>> of the capacitor within.
>>
>>
>> I doubt that changing those caps will resolve your hum. Jim and I agree (I
>> think) that reducing magnetic coupling is your best shot at the hum problem
>> resolution.
>>
>> Gary
>>
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