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Old 6th April 2012, 11:39 AM   #1171
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Quote:
Originally Posted by artmachine View Post
the pcb and components usedClick the image to open in full size.

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Replace those awful Tantalums next to the input MOS-FETs and you will hear a MASSIVE improvement. We used ELNA Silmic II. The Tantalums gave the amp an awful sibilance.

Last edited by KatieandDad; 6th April 2012 at 11:45 AM.
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Old 6th April 2012, 12:32 PM   #1172
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Who is this John.
MJL21193, John's a pro carpenter something.
1000 Watt Sub Amp: Design / Build
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Old 6th April 2012, 01:16 PM   #1173
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Replace those awful Tantalums next to the input MOS-FETs and you will hear a MASSIVE improvement. We used ELNA Silmic II. The Tantalums gave the amp an awful sibilance.
If you read through my Brother-in-Laws original thread you can see some of the lessons that he learned.

Aleph 4 Strickly DIY Project Build

I can see remarkable similarities in the two projects.
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Old 7th April 2012, 04:10 PM   #1174
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Originally Posted by KatieandDad View Post
Replace those awful Tantalums next to the input MOS-FETs and you will hear a MASSIVE improvement. We used ELNA Silmic II. The Tantalums gave the amp an awful sibilance.
I will try your solution
But because Mr. Pass uses tantalum in the aleph series?
my amp sounds great so it does not have any problem.
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Old 7th April 2012, 04:27 PM   #1175
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I have found that wood can act as a resonator and amplify any mechanical noise emitted from a transformer. That being said, it doesn't stop me.
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Old 8th April 2012, 07:43 AM   #1176
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Didn't build it. Had Tim Rawson make it. The original transformer by Krell failed and was irreplaceable. It's an Aleph 2 clone with all Pass Labs boards. I fashioned the bus plate from 1/4 inch copper just because it looked cool. The fins are almost adequate. In warmer months it can start getting too hot, so it's my winter amp.
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File Type: jpg krell 003.JPG (291.0 KB, 1710 views)

Last edited by ewhitaker; 8th April 2012 at 07:51 AM.
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Old 8th April 2012, 12:22 PM   #1177
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Originally Posted by ewhitaker View Post
The fins are almost adequate.
Mr Rawson must be a pretty smart guy.

Personally, i don't quite see how to get 2 times 300W dissipation from a KSA150 chassis, that was designed to handle 300W total at idle, aka 75W per heatsink.
(e.g., the official Krell brochure of the MDA300 model states 400W dissipation from 6 of the exact same heatsinks, same chassis as the KSA250, aka 67W per heatsink)

At least the front end boards have Mr Rawson written all over them.
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Last edited by jacco vermeulen; 8th April 2012 at 12:26 PM.
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Old 8th April 2012, 12:52 PM   #1178
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Originally Posted by artmachine View Post
I will try your solution
But because Mr. Pass uses tantalum in the aleph series?
my amp sounds great so it does not have any problem.
Mine might have had rubbish tants in it but the ELNA Silmic IIs made a HUGE HUGE difference.

I don't know about suppliers in Italy but here is a supplier in the UK. http://www.hificollective.co.uk/comp...apacitors.html

If you cant get them let me know, they should post out to Italy though.

Last edited by KatieandDad; 8th April 2012 at 12:58 PM.
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Old 12th April 2012, 05:23 AM   #1179
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Evanc - Sorry for missing this earlier. Thanks for following the thread. I had fun building it. Especially given all of the casework was scraps or repurposed parts (except for the heat sinks of course.) Even the amp board kit from techdiy was at a discount since he was nice enough to refund my money since the kits were not correct. This is probably the cheapest F5 ever built!

The F5 is so simple, especially compared to the Beta24 I'm currently trouble shooting. And of course, it sounds great.

Relative to using wood in amps, I've had good luck with them in the past and now with my F5. This is probably my 5th project with wood pieces integrated to some degree. Also, I personally like the contrast in material choices.

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Oneplustwo,
I followed your build thread. Glad you got it working.... Looks super. You must be proud of the result after the work you put in

Wood cases seem fine for amps, but maybe not projects that need the shielding of a metal chassis.
Evan
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Old 13th April 2012, 05:35 PM   #1180
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Default Wooden chassis

Here is my wooden chassis a40. Its been up and running for about 10 years and for the past 3 years it has been running 7 hours per day, 5 days per week with no trouble. I made it from a cut-down bed rail that I purchased for $3...

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