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Old 27th October 2011, 01:51 AM   #11101
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Quote:
Originally Posted by h_a View Post
Nice amp!



Might be a small grounding issue.

Hannes
Good thought Hannes. I will look into it.
Thanks
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Old 27th October 2011, 01:00 PM   #11102
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Originally Posted by dionisio View Post
Thanks Bear
The heatsink idea was not mine.. I got the idea from the Burning amp chassis that were given away at burning amp a while ago..
Each tube is attached using 2 screws from the inside of the tube into the back plate..

Given away by?

Mr. Pass or some other person.
Don't think I have seen that one before... not sure why I did not come up with it, but it may be that the extrusions in that shape are actually fairly expensive compared to some others and other solutions...

Would like to give credit.

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Old 27th October 2011, 01:12 PM   #11103
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Would be nice to find a "D" shaped extrusion. Would make a neat heatsink.
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Old 27th October 2011, 04:14 PM   #11104
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probably not the thread for this, but a D shape would not be too good unless the "|" part of the D was kinda short and the ")" part was stretched out and not a semi circle...

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Old 27th October 2011, 04:42 PM   #11105
flg is offline flg  United States
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Quote:
Originally Posted by bear View Post
Given away by? ...Don't think I have seen that one before... not sure why I did not come up with it,...Would like to give credit.
_-_-bear
Check out the PLH article. I saw it there first
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Old 27th October 2011, 06:14 PM   #11106
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Quote:
Originally Posted by vdi_nenna View Post
make a neat heatsink.
Best and prettiest heatsink for DIY.

(rods are shrunk in the base plate holes, easy peasy to do at home with an oven and a zero-F freezer, then anodize)
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Old 27th October 2011, 06:24 PM   #11107
a.wayne is offline a.wayne  United States
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...Whats dat masochist cooling by Jacco................
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Old 27th October 2011, 06:33 PM   #11108
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...Whats dat masochist cooling by Jacco................
masochism would be drilling all them holes
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Old 27th October 2011, 08:21 PM   #11109
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Never heard of a drilling template ?

You guys should try DIY marine heat exchangers, just the copper welding will drive ya nuts.
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Old 28th October 2011, 06:31 PM   #11110
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Smile altering the f5 sound

Hi,

as written from NP - how can i alter the sound to make it less bright (only a little bit) actually i´m using irf´s output fets and i will keep the single pair.





Quote:
Originally Posted by Nelson Pass View Post
Paralleling output devices will change the measured performance in various
ways. One thing it will usually do is increase the open loop gain, and the
other is that it will make it slower. Assuming that these do not cause some
instability (and modifying an F5 you have to watch out for that), there are
some general rules for how the sound changes.

The spectral balance between bass and treble will alter. The amp will seem
to have more bass and more power and control in the bass region. The
treble will recede a bit, and the overall tone of the amplifier will get darker.

This is not necessarily a bad thing. Usually there is a "best" balance between
light and dark, as with the Alephs. The 3 was a bit shiny, the 1.2 was
comparatively dark. For me, the 2 was just right.

The stock F5 circuit is a little shiny. Paralleling up outputs might help your
perception of the amplifier.

Also, the use of different outputs, in your case, the IRFP9240 will
substantially alter the tone. Again, you may prefer it - some people do.

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