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Heed canamp Mods Thread!! - Page 5

post #61 of 74
4/17/07 at 8:39pm
Quote:
Originally Posted by kaushama View Post
Most of them I bought from Farnell UK. I think they do have US branch too! Newark?
Newark is actually part of Farnell empire. Here is link: http://www.newark.com/
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post #62 of 74
5/13/07 at 8:56am
Thread Starter 
As I bought GS1 bacause of shipping delay of canamp to UK, I gave up the idea of modding canamp. I cancelled the order too. I have a full parts pack for modding canamp with all high grade components collected from suppliers. I have put it in sales forum as a bundle.
I can even mod a canamp for someone in UK with those parts as I did for MD10 DAC.

LM4562 (1)
DIP8 socket (1)
VISHAY BC 4.7nF Polypropylene (2)
AVX 0.001µF Polypropylene (2)
VISHAY ROEDERSTEIN 0.1µF Polypropylene (2)
VISHAY GENERAL UF4002 bypassed with 0.001Uf Ceramics (4)
RUBYCON ZA capacitors for 100Uf and 10UF electorlytics (2)
PANASONIC TS-HA 10000Uf 35V Capacitors (2)
Caddock 100ohm resistors heatsinked (Audiophile grade) (2)
470NF Wima MKS4 Polyprophelenes (2)
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post #63 of 74
5/22/07 at 6:09am
Quote:
Originally Posted by kaushama View Post
LM4562 (1)
DIP8 socket (1)
VISHAY BC 4.7nF Polypropylene (2)
AVX 0.001µF Polypropylene (2)
VISHAY ROEDERSTEIN 0.1µF Polypropylene (2)
VISHAY GENERAL UF4002 bypassed with 0.001Uf Ceramics (4)
RUBYCON ZA capacitors for 100Uf and 10UF electorlytics (2)
PANASONIC TS-HA 10000Uf 35V Capacitors (2)
Caddock 100ohm resistors heatsinked (Audiophile grade) (2)
470NF Wima MKS4 Polyprophelenes (2)
Thanks for the goodies Kaushama! I've now installed some of the components.

First on the list was PANASONIC TS-HA 10000Uf 35V Capacitors. They were a breeze to install, thanks to the snap-on legs and to the Team Heed providing necessary holes on the board. The caps are HUGE compared to the Jamicons and the height is almost custom tailored to the casings height. Somehow I expected improvements like tighter bass, but after having a listen there was no perceived improvement in that department but instead there seemed to be more room for instruments like crash cymbals. The sound signature was same, but perhaps less congested sound compared to the default. The perceived improvements were less than expected, but still positive.

Next I installed RUBYCON ZA electolytic capacitors, and in preparation for the dip8 socket installation I removed the the film cap next to the opamp and mounted a polyprop instead under the board. And holy cow... Just wow. I was grinning like a madman. The trebles sparkled, the bass drums did that exra wet "plop" I adore, acoustic music was more alive than ever (a department where CanAmp doesn't actually shine in it's default form I'm afraid) and yet all industrial tunes also sounded so frigging good at the same time. I could turn the volume up and up and the sound just got better, instead of the normal degration. The total transformation with only chancing all the electrolytics can be easily compared to changing a better set of tubes for a tube amp.

I should've stopped there and just enjoy the music but the tinkerer's drive was too strong so I popped the board once more out of the case and mounted the UF diodes which were bypassed by small ceramics, and polyprops instead of the 10nF film caps between the power transformer and the diodes. I'm not sure which one was the culprit, but this time it was more like couple of steps backwards. Compared to the previous listen, bass was bit more bloaty, upper mids unrefined. I think I'll try first stripping the ceramics from the diodes and then if that doesn't help I'll just mount the old ones back before continuing.
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post #64 of 74
5/22/07 at 6:39am
awesome Gaso! Let us know how it goes =)
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post #65 of 74
5/22/07 at 7:55am
Gaso, any pictures?
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post #66 of 74
5/22/07 at 9:26am
I'll try to take few tonight.
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post #67 of 74
5/22/07 at 2:15pm
Quote:
Originally Posted by Gaso View Post
I should've stopped there and just enjoy the music but the tinkerer's drive was too strong so I popped the board once more out of the case and mounted the UF diodes which were bypassed by small ceramics, and polyprops instead of the 10nF film caps between the power transformer and the diodes. I'm not sure which one was the culprit, but this time it was more like couple of steps backwards. Compared to the previous listen, bass was bit more bloaty, upper mids unrefined. I think I'll try first stripping the ceramics from the diodes and then if that doesn't help I'll just mount the old ones back before continuing.
Brief update here, it turned out the cause was the 10nF polypropylenes, not the diodes. Fortunately I was lazy and decided to try to change the default film caps back first, because removing the ceramics from the diodes afterwards seemed like major PITA due to space constraints and lack of proper tools available.

The "culprit"


Power caps compared to default Jamicons:


Rubycons and UF diodes (+ ceramics piggybacking them)


More Rubycons and the undermounted.1 uF cap legs, nothing else to see here yet


All is good again, I think I'll stick with this configuration for a while and take a good listen before moving to the opamp and other parts..
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post #68 of 74
5/22/07 at 2:49pm
Gaso, can you post a picture of the underneath of the circuit board? I wish to refer to your circuit for the "mount-under-the-board" mods!

TIA
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post #69 of 74
5/22/07 at 5:38pm
Sure, I'll take pics when it's more populated, there's not much there yet :P
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post #70 of 74
5/22/07 at 5:42pm
Thread Starter 
Ahh! Its good to see you like the parts. I carefully chose them for my CANAMP which never appeared at the doorstep. Still I have not cancelled it. I don't know what is wrong with UK distribution.

Have you swapped the resistor too?
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post #71 of 74
5/22/07 at 5:45pm
Thread Starter 
By the way I have another set of parts in my hands for sale!
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post #72 of 74
9/24/10 at 3:29pm

Sorry for digging up an old thread but I wonder if anyone done some more or different modding to their Heed Canamp ?

 

Mine is in the postal service here in Sweden and I´m looking forward to listen to the baby with my AKG K702´s.

Will surely mod it later on but first I need to learn what it sounds like "unmodded"

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post #73 of 74
9/24/10 at 6:14pm

Send me a PM and I will provide a link to someone who has successfully modified this unit. He is in your side of the pond! 

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post #74 of 74
1/14/12 at 4:41pm

I have a Canamp for USA mkt and had my local shop echohifi.com take out the very thin (22 gauge) hard wired AC cord and mounted in a C8 chassis mount.  My old headphone station is in flux since removing an old Meridian 203 DAC

 

But I did connect the Heed to my PS Audio PWD. Sounds good but not able to compare to my old setup.

 

I do seem to have quite a bit of hum at various places while rotating the volume. Thoughts? It looks like euro spec canamps have an IEC with different location for on/off switch. I wonder if Heed would just sell that back plate? Pix on C8 install to follow.

 

My initial impression with a C7 AC cord (PS Audio 1 mtr punch) not that overwhelming. I thought the soundstage would really open up more, doesn't seem to have done so.

 

I just found this thread today. Intrigued by available mods!

 

Thxs

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