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Old 30th November 2012, 05:04 AM   #601
neoinc is offline neoinc  Singapore
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I am using a Pensil for Alpair 6.
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Old 30th November 2012, 06:21 PM   #602
billyk is offline billyk  United States
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Glad to hear you like the combination. I just received my mMar-Ken6p kit from Dave and can't wait to get them built and give them a listen!
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Old 1st December 2012, 03:41 AM   #603
neoinc is offline neoinc  Singapore
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It sounds warm, detailed with good bass in a small room. I thought it is well match with ACA.
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Old 1st December 2012, 02:14 PM   #604
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Default Heat sinking

What temp does the standard heat sink that comes with the kit generate? I have a pair of 4.5"x4.5" sinks with 1" fins. I was wondering if I could get by with those?

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Old 1st December 2012, 03:23 PM   #605
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1A at 20V is 20W of course.
The temp rise above ambient depends on your heatsink.
From your data I would *guess* its an about 1degree C/watt heatsink which means it will have about 20 celcius temp rise.
But also depends on the heatsink orientation - flat, upright, that sort of thing.

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Old 2nd December 2012, 01:03 PM   #606
bcmbob is offline bcmbob  United States
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Hi, I'm an Amp-Camp nubee who just received two PCBs and am placing a parts order. This may have been answered earlier in the thread but I haven't read it all yet. I have several 3300uf 50V caps from a mis-order. Can I use these instead of the 35V spec on the BOM?
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Old 2nd December 2012, 01:13 PM   #607
6L6 is offline 6L6  United States
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Yes, you certainly may, they will work very well.

The voltage rating on a capacitor is a maximum, running it at a lower voltage has no downside, and will increase it's life as the cap is having an easier time.
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Old 2nd December 2012, 01:48 PM   #608
bcmbob is offline bcmbob  United States
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Thanks 6L6. Thought so but needed confirmation.

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Old 2nd December 2012, 01:54 PM   #609
tinitus is offline tinitus  Europe
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though lower voltage caps can have more capacitance for the same size(and money), higher voltage caps sometimes have better resistance specs(low ESR)

anyone seen the flat pack Cornel Dublier caps
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Old 2nd December 2012, 08:48 PM   #610
Congo5 is offline Congo5  United States
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Hi all, new here. I ordered boards and parts from Mouser today. I want to use this for headpones, othodynamic Fostex T-50's. I am new to DIY amps, but have read this thread, have built several CMOY's and have some background with electricity. HVAC, automotive, computers. These phones are rated at 3000mw. I measured a 1k sine wave from BK Precision 3020 modded t-50's....3.23v=104db * ** 4.14v = 110db so if math is correct 3.2v squared divided by 50ohms is 204mw .. 4.14v would be 342mw. If I understand the formula.... I can double R1,R2,R3,R4 and have enough power and a lot less heat. So I ordered extra 3W 1ohm and 1.3ohm resistors. If there is interest I can document the build and post it. I have an oscilloscope but can only do basic things so far... Thanks

Last edited by Congo5; 2nd December 2012 at 08:54 PM. Reason: grammer
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