Amp Hospital: Cyrus One

[Rare Bird]

Why throw the Slit Foil idea out the window! Why didnt you fit new Slit Foils?

[istari_knight]

Why throw the Slit Foil idea out the window! Why didnt you fit new Slit Foils?

2 reasons, firstly because they are £16 each & the amps only worth £75 on a good day. Secondly slit foils have lower impedance & better HF performance than regular caps, both of these "features" can be replicated by simply bypassing the regualr caps with films as I have done.

[Rare Bird]

[istari_knight]

You disagree ?

[Reid Malenfant]

I disagree, kind of Slit foils are a way of making a capacitor behave like a load of smaller electrolytics, they'll have a much lower ESR.

While you will get the benefit of lower ESR at a higher frequency with the bypassing, you won't get the same at a low frequency as you'll be using some kind of standard electrolytic


So, kind of

[istari_knight]

I disagree, kind of Slit foils are a way of making a capacitor behave like a load of smaller electrolytics, they'll have a much lower ESR.

While you will get the benefit of lower ESR at a higher frequency with the bypassing, you won't get the same at a low frequency as you'll be using some kind of standard electrolytic


So, kind of

Well you learn something everyday ! Thank you for taking the time to explain

Do you think the 22 year old original slit foils had lower ESR than the new bypassed replacements ?

My cap meter only measures capacitance not ESR which is a PITA.

[Reid Malenfant]

Ah, good point Your more modern replacement capacitors are likely to be in better condition ESR wise due to age...

If I wasn't going to replace them with slit foils, I'd use something like Panasonic FC series instead, they are very low ESR for the money

[istari_knight]

Good choice - I used those on a faulty plasma tv power supply last week with good results... well, it fixed it lol.

Dont know if you will be able to view it but: http://www.kendeil.com/pdf/K05_type.pdf Part number : K05050103_PM0E040

Would actually be handy to get your opinion on them as I always use them when replacing large filter caps in amps - If they're shite I wont bother anymore

[Reid Malenfant]

I don't need to hit the link They are very high quality capacitors & I wouldn't hesitate to use them, same as BHC

[istari_knight]

I don't need to hit the link They are very high quality capacitors & I wouldn't hesitate to use them, same as BHC

Thats exactly what I wanted to hear

For those that are interested I bought some chemical etcher & black spray paint today ready for the weekend. I did look into getting some nextel from Germany but it was a complete PITA so decided against it. I see Nextel is now used in interior design to make textured walls etc... different! thats for sure