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Old 4th October 2010, 03:05 AM   #1
dr0ss is offline dr0ss  United States
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Default heat sources in SSE

I finally have some time to put my SSE together, and I've been working on the enclosure. This will be a more-or-less completely enclosed amp made of wood, so I need to pay special attention to how the ventilation works (especially since I live in the tropics). My current plans have good airflow to the parts I know to be major heat producers: transformers, the tubes, and the big resistors.

The power supply choke however is tucked away and surrounded around 75% by support walls. If this is likely to be a problem I can make some modifications and even add a heat sink or fan, but first I'd like to be sure it is going to be a necessity. Is this a part that tends to run hot? Are there any other extra-hot-spots I should be paying attention to?

Thanks, David
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Old 4th October 2010, 03:20 AM   #2
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The choke should not get hot. The output transformers should not get hot unless they absorb radiant heat from nearby tubes. The power transformer, the tubes, and the 3 five watt resistors are the big heat producers.

The Industrial amp that I built on my web site is too small with zero ventillation under the chassis. The entire circuit board and the choke is under the deck. The amp gets too hot especially since I am running my power transformer way above its recommended current, but it hasn't missed a beat since day one.

If you put the whole amp in a box, you need a vent on the top to let the heat out, but you also need an unobstructed air entry on the bottom to let cool air in.
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Old 4th October 2010, 05:19 AM   #3
dr0ss is offline dr0ss  United States
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Thanks, this is useful.

This is going to be a fairly small amp; the interior dimensions are 8"dx12"wx6.5"h, and everything will be shoehorned inside, including the tubes and iron. No doubt I'll regret the decision to go this small, but it was so much fun finding a layout where this was even possible that I am determined to go through with it. The biggest problem was finding a good spot for the choke, which is both heavy and an awkward shape. Where I have it now is very convenient, but when I noticed that the resistor that the choke replaces was 5W I started to worry.

Thanks again,
David
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