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Old 13th April 2012, 05:48 PM   #1181
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Eric, looks good. What wood is the front panel?
Does the wood get hot? Is it isolated from the heat sinks?

I'm making a wood front panel for a Zen 9 this weekend.
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Old 13th April 2012, 06:00 PM   #1182
Eric is offline Eric  United States
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Hi Vince,

Its a 1" thick multi-layer ply with a real wood veneer. The heatsinks are bolted directly to the side panels - no additional isolation or spacers were used. There are multiple holes drilled in the bottom panel and the top panel is hinged for easy open. The hinges and and felt pads where the top panel rests provide some "elevation" to the top panel so it does not close tightly on the four sides. Thus, there is an air gap of about 1/4" all of the way around the top to let heat from the transformer/rectifiers to escape. Here is a better picture of the sinks.

Click the image to open in full size.

The wood chassis does get warm, but typically stays close to body temperature - 100F. From time to time, I've thought about adding a copper/aluminum plate to the underside of the top panel just above my DIY heatsinks for the rectifiers, but I've never gotten around to it. The wood is very slightly more dried directly above the rectifiers - you can see several small cracks in the surface if you look closely, but it doesn't cause any concern for me.

Hope this helps!
Eric
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Old 13th April 2012, 06:11 PM   #1183
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Yes, it does. Thanks.
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Old 22nd April 2012, 03:02 PM   #1184
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My dual output F5. My first attempt at amplifier assembly. Thanks to the information on this forum, it worked first shot and sounds better than I deserve. Heatsink at 50 degrees with case open and drain of mosfet at 63 degrees (fluke thermal probe).

F5 - a set on Flickr
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Old 22nd April 2012, 03:09 PM   #1185
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Nice. How does it compare to the Ncore?
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Old 22nd April 2012, 03:23 PM   #1186
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Thanks. As I've just finished the Ncore, not had much time to listen yet. First impressions are that the F5 is slightly warmer sounding. Will report back when I've spent more time with them.
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Old 22nd April 2012, 03:31 PM   #1187
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Is that a Claro Dual on top?
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Old 22nd April 2012, 03:39 PM   #1188
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Claro 09. It was a special version made for me with taller platter and a bespoke mounting for the SME V. I use a Nottingham Analogue Wave Mechanic with it and it sounds brilliant. With the Koetsu Rosewood it sounds better than the Xmos/BuffaloIII/Legato 3 digital front end in my system:-).
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Old 22nd April 2012, 05:55 PM   #1189
fdlsys is offline fdlsys  South Africa
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Quote:
Originally Posted by vanwykca View Post
My dual output F5. My first attempt at amplifier assembly...
Beautiful work Cornelius! Congrats.
If I may ask - what are those rectifier bridges that you are using, and the slow-start circuit?
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Old 22nd April 2012, 06:07 PM   #1190
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Thank you. The rectifiers are IXYS Fred 68A 600V bridges

http://www.partsconnexion.com/PDF/l363.pdf

and the slow start is the SSM module from Avondale Audio

soft start electronics for audiophile hifi audio amplifiers : avondale audio
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