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Old 8th April 2009, 10:13 PM   #41
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Thanks korben,

As j do not kwow what is dead or not, j have ordered new pcb and will change all componants.

Now j check the bom.
It was the first time j did not sucess
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Old 9th April 2009, 05:47 PM   #42
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Peter

on your F5 pcbs there is 2 holes for the gnd which can be used for say In and out gnd
but where to connect gnd from rails
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Old 9th April 2009, 07:38 PM   #43
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There are 2 gnd pads: one for RCA input, the other to connect with main filter caps. The output gnd is not taken from amp board (as it wouldn't make much sense) but from a common point on main filter caps.
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Old 10th April 2009, 05:48 AM   #44
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thx

when you do Initial set up - Is It Important to short Input to gnd

are you happy with sound of your F5
what bias you set 1.3 or high
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Old 10th April 2009, 03:06 PM   #45
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It is recommended to short the input, however, I did all my testing with input open and it worked equally fine. I used 1.3 amp bias, the heatsinks allow for more, but I'm not really crazy about pushing it.

Yes, I'm happy with a sound of F5 and that's the amp I'm presently using in a basement system.

Please see attached pic for my current setup. As mentioned earlier, the amps are behind the separating wall, in which Fertin drivers are installed. You will see battery driven (charger permanently in parallel) field coil supply.

There is no power switch directly on the amp, I installed it in a special housing on near cabinet wall.
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Old 10th April 2009, 03:10 PM   #46
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The other channel looks very similar:
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Old 10th April 2009, 08:13 PM   #47
JoshK is offline JoshK  Canada
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Quote:
Originally posted by Peter Daniel

... but since the shipping is already included in the price of the boards, you may as well order them online.
Maybe I am blind, but I looked on your website and I don't see a place to order F5 boards. I would like a pair of the boards if you got 'em. However you'd like me to order them, I'm game.
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Old 10th April 2009, 08:19 PM   #48
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This is not my design, so I'm not selling them from my website, you can get the boards only through this Forum.

The instructions to purchase were explained in a first post of this thread: http://www.diyaudio.com/forums/showt...89#post1771389
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Old 10th April 2009, 11:13 PM   #49
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Default F4 & F5 Board Availability

Peter...

Just found this site a few days ago.... The mother load!

I started the Pavel today... Transformers arrive Mon.

Are there any of the F4 boards available? F5? PS?

What, in your openion, are the sonic differences?

MDH
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Old 11th April 2009, 12:52 AM   #50
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Yes, both F5 and F4 boards are available. No PS pcbs though, but it's so simple that p2p or veroboard method could be actually better than universal board.

As to comparison, I never built F4, so can't comment; regarding other amps, I expressed my views here: http://www.diyaudio.com/forums/showt...t=#post1741265
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