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Old 9th October 2013, 05:40 AM   #2281
Jean is offline Jean  United States
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Quote:
Originally Posted by 12B4A View Post
Thanks! I'm still stuck on what to do with that giant blank faceplate. I've been looking at temperature meters but I have no idea what to look for configuration-wise if I want to do an analog meter.
Hi, what is the size of the heatsink you are currently using in your chassis for AJ ?
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Old 9th October 2013, 11:53 AM   #2282
12B4A is offline 12B4A  United States
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I am using the diyAudio 4U chassis which are 300mmx160mm40mm heatsinks.
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Old 21st October 2013, 11:41 AM   #2283
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Default F5 half finished

Here's hoping that I've got everything right - one half of it is ready for testing.
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Old 21st October 2013, 11:08 PM   #2284
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Here's hoping that I've got everything right - one half of it is ready for testing.
I suggest using ~1/4 inch spacers to put some space between the heat sink and the steel chassis side, so that the flat part of the heat sink can cool and not be insulated by the steel.
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Old 22nd October 2013, 02:08 AM   #2285
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Here's hoping that I've got everything right - one half of it is ready for testing.
What are the dimensions of that heatsink?
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Old 22nd October 2013, 02:25 AM   #2286
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The black steel pressing is one side of a 4U 19" rack case.

The heatsink is approx 300mm wide x 180mm tall with fin height about 60mm.
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Old 22nd October 2013, 12:41 PM   #2287
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Default Better propective

This photo might better show the relative size of the heatsinks.

The case is a 4U chassis, the toroid is a 500VA unit.

The two big caps are 22000uF Audio Grade caps then feeding a CRC filter with 10 x 4700uF caps.

This amp is only intended to operate as the HF amplifier in a tri-amp setup.
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Old 24th October 2013, 01:42 PM   #2288
jdg123 is offline jdg123  United States
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Default how many fins...

Here is a shot of my newly constructed Aleph J.

The heatsinks are pretty small; each side assembly adds to about 8x10 inches of fins. The heavy aluminium brackets probably help...

I played it recently for 4 hours driving 4 Ohm speakers (KEF 104/2) straight out of the CD player and though it got hot it never got past the 5 second touch rule.

Perhaps I am just lucky so far but I might have done right by keeping the fins up high for good air flow; it was my whole intention with the tiered nature of this scrapyard build.

I'd say be smart and fearless. If it gets too hot you'll have to rebuild. Just don't leave the room while you do your testing
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Old 24th October 2013, 01:44 PM   #2289
6L6 is offline 6L6  United States
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I love it!!

Congratulations on a successful build!

The blue glow reminds me of Cherenkov Radiation - Cherenkov radiation - Wikipedia, the free encyclopedia
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Old 24th October 2013, 01:47 PM   #2290
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Default It's coming along

Finally got around to the mechanics of the second amplifier, just need to solder it all together now.
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