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PostPosted: 10 Oct 2009, 12:48 
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Joined: 27 Aug 2009, 15:19
Posts: 197
Location: Sweden
Hi Guys,
A friend of mine asked me earlier if i could build him a solid state Class A amp and i found this out
on e-bay and wonder if this could be a good amp project ?
at a cost of $22 incl shipping for 2 pc boards sounds as a pretty good deal,
Attachment:
Pass-F5-Clone-PCB-eBay.jpg

Regards,
Kjell.


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PostPosted: 10 Oct 2009, 15:57 
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Joined: 08 Aug 2009, 03:11
Posts: 1300
Location: Chilliwack, BC
Don't forget that most Pass and Pass clones need a $100 heatsink to keep themselves from cooking ;)

Cheers!

_________________
-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


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PostPosted: 10 Oct 2009, 17:52 
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Joined: 27 Aug 2009, 15:19
Posts: 197
Location: Sweden
Damn :shock:
better go down to nearest nuclear plant and see if they spare a couple :D
would be great if i could see a picture on one of those heatsinks,
do you know of anyone ?


Regards
Kjell.


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PostPosted: 10 Oct 2009, 18:00 
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Joined: 08 Aug 2009, 03:11
Posts: 1300
Location: Chilliwack, BC
They require about a 0.25C/W or better chunk of metal for stereo, I know from experience... and that just keeps them at ambient + 30C (so at room temp, they hit 50C./122F.) :hot:

There was an individual on diyAudio that was selling adequate heatsink by the foot (he got them in loooong lengths and cut them himself), but since the board reorganized, I've lost track of most of the threads :worried:

Cheers!

_________________
-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


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PostPosted: 10 Oct 2009, 18:06 
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Joined: 27 Aug 2009, 15:19
Posts: 197
Location: Sweden
Oki, thanks Geek,
That i didn't know about the F5 amp exept they are to be a killer design and sound so far i got'it in
a bunch of searches on this amp on the net.


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PostPosted: 10 Oct 2009, 19:39 
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Joined: 08 Aug 2009, 03:11
Posts: 1300
Location: Chilliwack, BC
You're welcome!

They are killer designs that don't sound like anything out there and yet, both tube and SS. I personally love them.

Nelson is a genius :wizard:

Cheers!

_________________
-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


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PostPosted: 11 Oct 2009, 10:33 
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Joined: 28 May 2008, 21:53
Posts: 4212
Location: Winnipeg, CANADA
Hi Kjell,

The Pass F5 is supposed to be a great amp. I've already got boards and have the amplifier parts and chassis + heatsinks on the way. I still need to order the power supply parts.

If you have not seen this already, here is the documentation for the F5:
Attachment:
First-Watt- mode-F5-Operation-and-Service-Manual.pdf


Also here is a link to Uriah's power supply: viewtopic.php?p=259#p259

I ordered the F5/VISHAY-IRF Kit from: http://tech-diy.com/Store/CloneKits.htm

Once I get the parts I'll start a build thread and post some photos.
Cheers


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PostPosted: 11 Oct 2009, 12:10 
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Joined: 27 Aug 2009, 15:19
Posts: 197
Location: Sweden
Hi Gio,
Thanks for those links they are pretty interesting and found a few nice item's but i still looking for
someone who sell's heatsinks or even better extrudet alu so i can cut my own pieces,
Been looking around in this freeze box to country ( Sweden ) after those but 0 - Zero - Zippo - nada,
cooling for computer's are in numbers of 27 to a dozen thou :worried:

Regards,
Kjell.


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PostPosted: 12 Oct 2009, 01:35 
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Joined: 08 May 2009, 08:20
Posts: 918
Location: Duesseldorf, Germany
I'm also searching for some extruded alus... Maybe i've got some...

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Cheers,
Tom.

Some of my projects: TDA2050 Chip Amp, the LM3886 Gainclone Thread and the Szekeres Headamp Thread.


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PostPosted: 12 Oct 2009, 11:04 
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Joined: 27 Aug 2009, 15:19
Posts: 197
Location: Sweden
Either that or take this issue down to my workshop and put my mill into work and take 2 slabs
of solid alu pieces and make 2 pc watercooled heatsinks :geek:
hell of a long shot with a lot of twitchings but result gotta be pretty :cold:

Regards,
Kjell.


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