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Old 26th February 2012, 11:07 PM   #1101
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Sven

Your F4 is AWESOME!
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Old 28th February 2012, 07:00 AM   #1102
CENTRAL is offline CENTRAL  Greece
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Great F4!!! It would put (too) many hi-end amplifiers to shame! Great job - congratulations!!!
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Old 29th February 2012, 02:07 AM   #1103
jleaman is offline jleaman  Belgium
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Great F4!!! It would put (too) many hi-end amplifiers to shame! Great job - congratulations!!!
I agree, that is top notch!
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Old 29th February 2012, 02:42 AM   #1104
skunark is offline skunark  United States
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Sven,

Very impressive! Can you provide any details on the design process of the chassis?

Jim
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Old 29th February 2012, 04:50 AM   #1105
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It agree, very much impressively! Too it would be desirable details!
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Old 29th February 2012, 07:52 AM   #1106
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Thanks for the kind words.

The concept is straight forward – the case is built around the heat sinks, they are 300x150mm (Fischer KL-271). If the heat sinks are the sides we obviously need 4 other elements – lid, bottom, front and back. Front is 10mm aluminium, the other 3 parts are 6mm. Everything is CNC machined, shot blasted (glass pearls) and anodized. Not painted etc.. There are washers between the bottom/lid and the heat sinks to allow air exchange. The principle is copied from Chris “Elfenreiters” cases who is also one of the two guys who organized the PCB group buy etc.. You can find more information in the thread in the German Analogforum here.
Here are the pictures of Chris’ cases (registration required).

In the same thread you will see some pictures of my cases in different stages of “production”.

E.G. here after shot blasting before anodizing:


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So – the concept is stolen (), the details like engravings, bevels, logos, exact sizes etc. have been drafted by me and executed perfectly by a guy I know. I think this really makes the difference – it’s basically done perfectly. It’s not easy to get this kind of perfect result no matter how much money you are prepared to spend. You need to find somebody (or be somebody) who not only has the technical capabilities and skills but also really cares.

Best Regards
Sven

PS: I do have nightmares about accidentally scratching it!
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Old 4th March 2012, 04:27 PM   #1107
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... the heat sinks, they are 300x150mm (Fischer KL-271).
Awesome looking amps!!! Well done!!

Where have you bought the heat sinks?
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Old 4th March 2012, 04:34 PM   #1108
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Pretty, isn't she?
Very
(don't shoot that one)
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Old 4th March 2012, 05:18 PM   #1109
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Apologies, the heat sinks are not Fischer, they are Seifert Electronic KL-271. I ordered them directly from Seifert. It's been a while.

Sven


PS: If you are not fed up yet - close-up's 1,2
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Old 5th March 2012, 02:13 AM   #1110
fjpolo is offline fjpolo  Argentina
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Default ZV1

First Pass project I make had to say goodbye to my dear IRFP250, so I need a waay better heat sink
I'm not actually a fan of class A amps, but I'm really happy with this little guy
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