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Old 5th April 2010, 04:05 AM   #7671
tinitus is offline tinitus  Europe
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It might work safer with device clips
Its tempting

I dont know if black anodizing are made in different ways
The only one I have tried to grind smooth with sandpaper showed a white and VERY tough layer of something between the black anodizing and the alu profile
Im sure that white layer isolates very effectively
Somehow I expect silver anodizing to be different

But the mounting screw may change things
Doing the needed thread can cause various things
Like material rise around the thread hole, etc
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Old 5th April 2010, 05:50 AM   #7672
Renron is offline Renron  United States
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Pblossom,

Thank you for your input, yours is the only direct response from the "horses' mouth". They should know their products strengths and weaknesses.

Papa bought a case of Thermalcote for a reason.......Yes? Good enough for me!

Anodization is a great insulator, but fragile and prone to scratching.

I'll save the Arctic Silver for the CPUs, YMMV.

Ron
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Old 5th April 2010, 06:01 AM   #7673
Renron is offline Renron  United States
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A lifetime (and 1/2) supply on Fleabay.
One pound of Thermalcote. LOL

Ron
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File Type: bmp thermalcote.bmp (175.6 KB, 274 views)
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Last edited by Renron; 5th April 2010 at 06:15 AM.
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Old 5th April 2010, 07:15 PM   #7674
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Quote:
Originally Posted by Renron View Post
Papa bought a case of Thermalcote for a reason.......
I did not say I bought it.

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Old 5th April 2010, 07:30 PM   #7675
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Hello Mr Pass,
I'm building an F5 amp, to feed a pair of 94db/2,83v speakers, do you think I'll need a preamp to get a realistic level ?
Thanks for sharing - this is my first pass diy project !
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Old 5th April 2010, 07:42 PM   #7676
AndrewT is offline AndrewT  Scotland
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The gain of the F5 is ~6times (~+15dB)
the max signal from a cdp is ~2.1Vac.
The max signal from the F5 will be ~12.6Vac
This is equivalent to ~20W into 8ohms. Not quite full power.
The F5 sensitivity is just slightly more than most CDP and considerably more than lower voltage sources. A pre-amp with gain may be required depending on the voltage from your sources.

Now let's look at what SPL you can get.
20W is 13dBW.
The speakers are 94dB/W@1m.
The maximum SPL is ~107dB @1m
If your average level is 20dB below your maximum then your average listening level with zero attenuation from a 210mVac signal (-20dB ref 2.1Vac) will be ~87dB @ 1m. That is getting pretty loud for most listeners. But that requires a high maximum voltage source. Maximum average level will depend on your source voltage.
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Old 5th April 2010, 08:31 PM   #7677
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So,
for my domestic purpose, I guess It will be sufficent, with cdp or phono preamp, isnt'it ?
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Old 5th April 2010, 08:37 PM   #7678
Bigun is offline Bigun  Canada
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Seems to me you don't need a preamp. But look on the bright side, if you find you need a little more gain you have a reason to build a nice preamp
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Old 5th April 2010, 08:41 PM   #7679
Renron is offline Renron  United States
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Quote:
Originally Posted by Nelson Pass View Post
I did not say I bought it.


Thanks for makin' us laugh Papa.

BTW, Love my F5!

Ron
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Old 5th April 2010, 11:07 PM   #7680
a.wayne is offline a.wayne  United States
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What is the aversion to running a pre-amp with the F5 ? it seems that the gain is of some concern, No ? ...
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