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The Apple diyMod: My Take on the Famous iMod [56k killer] Featuring 3G, 4G, 5G and nano 1G! - Page 176

post #2626 of 2980
Quote:
Originally Posted by mpawluk91 View Post


So the Kermet cap is a polyester film cap?

Yeap. One thing I would like to say it again about these film caps is they do need time for burn-ins. I would say at least 50 hrs to bring out the beauty and perhaps take 100 hrs to settle down. So if you use the film caps be prepared for the initial roughness, and don't let the initial "disappointment" trick you thinking these are no good. Be patient.

post #2627 of 2980
Yup.They can sound grainy and disjointed for the first few hours then get better.

D- I still haven't got the Kemet caps to try out. I've been waiting on a "mod-job" I'm expecting to receive before I buy anymore parts. When I do try them and if they are really good I may put them in the Frankenmod to slim it down a bit. That thing needs a diet. Bikini weather and all...
post #2628 of 2980
..oops double mobile post
Edit: or put them in the Bride of Frankenmod (the other 5G) that thing needs a reason to live
Edited by thegrobe - 5/25/13 at 5:59pm
post #2629 of 2980

Haha, you won't be disappointed with these KERMIT caps my friend and you ipod 5.5g deserves these caps. Hey with this mod and UHA they are perfectly portable if you have that amp wallet.

 

Sometimes I couldn't believe what I hear - it's too good to be true.

post #2630 of 2980

Another thing is the synergy. The mod with the Kemet caps and the UHA amp are a perfect fit for my treble king EX1000. I swear it's better than xxx.

 

The separation and clarity are ridiculous. I can hear all the junks in the recording, including the performers' finger movements on the instruments.

post #2631 of 2980
Quote:
Originally Posted by DMinor View Post

Another thing is the synergy. The mod with the Kemet caps and the UHA amp are a perfect fit for my treble king EX1000. I swear it's better than xxx.

The separation and clarity are ridiculous. I can hear all the junks in the recording, including the performers' finger movements on the instruments.
I'm stickin with my arrow 4g and getting a fiio e12 also I have a c&c bh and a fiio e6
post #2632 of 2980
Quote:
Originally Posted by DMinor View Post

Yeap. One thing I would like to say it again about these film caps is they do need time for burn-ins. I would say at least 50 hrs to bring out the beauty and perhaps take 100 hrs to settle down. So if you use the film caps be prepared for the initial roughness, and don't let the initial "disappointment" trick you thinking these are no good. Be patient.
Where can I get these man
post #2633 of 2980
post #2634 of 2980

I have also read good things about the Mundorf caps, but non of their film caps could fit even the fat ipod. There is only one electrolytic cap which may have a slight chance to get in the ipod:

 

Mundorf E_Capacitor_049_ECAP70 4.7uf / 50VAC-70VDC, MLytic® Bi-Polar AC (ECAP70-Plain), 10mmD x 30mmH

 

You know we are blessed with the 5g's and these caps. In my opinion that's enough to get the quality sound without spending tons of money chasing something which may be impossible. I am now a FIRM believer of the caps because of my experience. The caps probably have far more impact on the sound from these ipods than anything else, unless you are using the earbuds and play 128kbp MP3's.

 

I asked in the AK100 thread if any owner of that dap in my city would like to meet with me to do a comparison between the AK100 and mine ipod. But so far I have received no response. Although I am so pleased with what I am hearing from the ipod, I hope I am wrong and these high-end daps are far better than the modded ipod.


Edited by DMinor - 5/25/13 at 7:41pm
post #2635 of 2980
Quote:
Originally Posted by thegrobe View Post

Different qualities of material.

Take a 4.7 cap for example. Electrolytic caps are tiny and can have huge uf ratings. Many people think these are fine, perhaps because of the convenient size. I personally think the sound is lacking.

Next there is polyester film caps. In the same 4.7 rating, each cap is about 2-3 times the size of the electrolytic. But it will still fit in a deep back iPod. These sound much better and is the minimum quality I would recommend to use with the mod.

Next film cap is polypropylene. These sound fantastic! But the size of one in a 4.7 rating is about half the size of an iPod and more than twice as thick. Also pretty expensive. That's the giant caps you see.
Then there's other more exotic materials but I won't comment because I haven't tried them.

Personally, my favorite iPod mod has two fairly large 3.3uf Wima polypropylene caps mounted in an altoids tin on the back of my 5G iPod. Any larger value wouldn't fit the tin. It's all wired from the DAC with solid silver wire to the caps then direct to the line out pins, bypassing everything in the iPod.

It sounds great but it's big and ugly! A sensible middle ground is the polyester film caps, maybe Dminor will chime in here and back me up.
Your positive that the polyester film cap will fit in the fat 5.5 with a cf card?
post #2636 of 2980

I decide finally to apply this mod to my old 5.5 iPod.

My iPod is already moded with a 240 GB HDD and new battery so I will not have enough space to cram the capacitor inside the case, the good point is that I don’t need to bother with caps dimensions. For the moment I’m thinking to put the caps on the interconnect cable.

I have a Bottlehead Crack amplifier and as far I can see from schematics there are no caps between input connector and pre amp tube (12AU7), only the volume potentiometer so I will take the safe way and put the caps.

According to the comments from thread the caps can be between 2uF and 4.7uF. I plan to buy the following caps:

AUDIOPHILER Metallized Polypropylene Capacitors 4.7uF MKP ±3% 400V HE

CLARITYCAP Metallized Polypropylene Capacitors 4.7uF ESA ±3% 250V

Mundorf MCap250 4.7uF Polypropylene Capacitors 250 VDC

 

Should I consider other caps or other caps capacities?

Thanks

post #2637 of 2980
Quote:
Originally Posted by cmiu View Post

I decide finally to apply this mod to my old 5.5 iPod.
My iPod is already moded with a 240 GB HDD and new battery so I will not have enough space to cram the capacitor inside the case, the good point is that I don’t need to bother with caps dimensions. For the moment I’m thinking to put the caps on the interconnect cable.
I have a Bottlehead Crack amplifier and as far I can see from schematics there are no caps between input connector and pre amp tube (12AU7), only the volume potentiometer so I will take the safe way and put the caps.
According to the comments from thread the caps can be between 2uF and 4.7uF. I plan to buy the following caps:
AUDIOPHILER Metallized Polypropylene Capacitors 4.7uF MKP ±3% 400V HE
CLARITYCAP Metallized Polypropylene Capacitors 4.7uF ESA ±3% 250V
Mundorf MCap250 4.7uF Polypropylene Capacitors 250 VDC

Should I consider other caps or other caps capacities?
Thanks
Can you provide the input impedance of your amplifier to pinpoint the optimal cap value? 10k, 50k, etc..thanks
post #2638 of 2980

The input impedance for Crack amp is 100K.
 

post #2639 of 2980
Quote:
Originally Posted by cmiu View Post

The input impedance for Crack amp is 100K.
 

With that rating, you can use a pretty low uf rating. 1 uf would do. If you want to be EXACT, you need .8uf

 

If you ever wanted to use the modded iPod with another amp, though, you may want to use a higher value. For example, the amp I use has a 10k impedance, and I need ideally an 8uf cap. 

 

So the 4.7 rating you listed would be more than enough for your needs, and give you the option to use other amps as well. But if you are sticking with the one amp, I would recommend 1 uf. The 4.7 cap puts your -3db point way down at .35 Hz. You may want to research if a really low -3db point may leak DC, (the whole reason for the caps is to block DC) I am not sure...It's worth looking into. 

post #2640 of 2980
Quote:
Originally Posted by thegrobe View Post

With that rating, you can use a pretty low uf rating. 1 uf would do. If you want to be EXACT, you need .8uf


Thanks a lot for answering my question. For the moment I plan to use the iPod only with this amp, and because I plan to put the caps outside (most probably directly on the cable) I can play around with caps (rating and types). And as a bonus the caps are almost half the price :)

 

Because it will not be a mobile solution I'm thinking that most probably I will route the signal thru the headphone jack. The iPod usually stands in the dock and I have opened yesterday night the dock hoping that the line out jack comes directly from the bottom iPod pins, but unfortunatelly it seems that first goes thru a integrate ... I will try pull the pcb out in order to inspect it visually and/or measure the path woth an ampermeter.

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