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Post by Sovereign on Jun 30, 2015 11:55:20 GMT
Would you expect the more powerful one to sound better than the smaller one at (for example) 10 watts per channel ?It will be interesting if Colin and I can get together all the Wonfor Class A amps at my place and have a bit of a bake off, then give feedback for others to be informed |
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Post by Deleted on Jun 30, 2015 13:10:49 GMT
What is it thermal rating C/W??
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Post by pre65 on Jun 30, 2015 17:17:07 GMT
What is it thermal rating C/W??
They were out of computer UPS units.
I feel sure they are big enough.  |
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Post by Deleted on Jun 30, 2015 17:26:26 GMT
Ah UPS that bring back nice memories, How many VA was it? I did some designs for 100KW using Thyristors for BP, fun days.
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Post by pre65 on Jun 30, 2015 17:34:14 GMT
Ah UPS that bring back nice memories, How many VA was it? I did some designs for 100KW using Thyristors for BP, fun days.
I got them off Ebay. |
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Post by Deleted on Jun 30, 2015 17:44:01 GMT
OK lets do it the hard way give me length, width, height, fin numbers, fin depth, base thickness I will asume it a aluminium alloy. And how much does it weigh? I will calculate it for you, for a vertical use in free air at 20C. And 100mm from a base. Will that be OK?? If I can find my slide rule that is.  |
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Post by pre65 on Jun 30, 2015 18:01:42 GMT
Right
300mm long x 200mm wide x 70mm deep. Base 10mm thick fins 60mm deep.
16 proper fins and 2 sides. 4.5KG weight each.
The CD in the picture gives an idea of the size. And yes, those capacitors are mighty big as well. 
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Post by quickie on Jun 30, 2015 18:02:45 GMT
Would you expect the more powerful one to sound better than the smaller one at (for example) 10 watts per channel ?It will be interesting if Colin and I can get together all the Wonfor Class A amps at my place and have a bit of a bake off, then give feedback for others to be informed Lol......will be interesting trying to get them all in a Porsche Boxster |
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Post by Sovereign on Jun 30, 2015 18:30:57 GMT
OK lets do it the hard way give me length, width, height, fin numbers, fin depth, base thickness I will asume it a aluminium alloy. And how much does it weigh? I will calculate it for you, for a vertical use in free air at 20C. And 100mm from a base. Will that be OK?? If I can find my slide rule that is. That's service for you ! |
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Post by Sovereign on Jun 30, 2015 18:32:09 GMT
It will be interesting if Colin and I can get together all the Wonfor Class A amps at my place and have a bit of a bake off, then give feedback for others to be informed Lol......will be interesting trying to get them all in a Porsche Boxster Sounds like a hairdressers car to me  |
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Post by Mr Whippy on Jun 30, 2015 18:37:59 GMT
Would this case on e-Bay be any good for one for low power use? It measures 257 x 211 x 90.
251742742482223
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Post by quickie on Jun 30, 2015 18:53:58 GMT
Lol......will be interesting trying to get them all in a Porsche Boxster Sounds like a hairdressers car to me Trust you Mr James ! Your Ebay auction number no worky. There are a few not huge cases on there that would probably do, failing that Modushop are good. Got mine on Ebay, but didn't want the heatsinks exposed. |
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Post by pre65 on Jun 30, 2015 18:55:32 GMT
Would this case on e-Bay be any good for one for low power use? It measures 257 x 211 x 90. 251742742482223 Can't find that item number.  |
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Post by Mr Whippy on Jun 30, 2015 19:04:54 GMT
Sorry. A few too many digits.
251742482223
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Post by pre65 on Jun 30, 2015 19:08:23 GMT
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Post by quickie on Jun 30, 2015 19:09:15 GMT
Right
300mm long x 200mm wide x 70mm deep. Base 10mm thick fins 60mm deep.
16 proper fins and 2 sides. 4.5KG weight each.
The CD in the picture gives an idea of the size. And yes, those capacitors are mighty big as well.
About 0.35 C/W (correct me if i'm wrong Colin) |
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Post by quickie on Jun 30, 2015 19:11:22 GMT
Too small. That seller does some bigger ones iirc......... |
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Post by Mr Whippy on Jun 30, 2015 19:18:23 GMT
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Post by Mr Whippy on Jun 30, 2015 19:19:55 GMT
Too small. That seller does some bigger ones iirc......... Yes. Some rather nice ones, depending on your budget. |
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Post by Deleted on Jun 30, 2015 19:29:58 GMT
Bloody close, the calc say 0.295C/W in Black. So the same as Pauls and James.
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