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Post by Eduardo Wobblechops on May 24, 2015 20:09:06 GMT
They that again-
Just plumbed in a 300 yesterday, John I note in the above picture that one of the LED rings is red - the same happened to mine (I'd removed the fan as too noisy). I assume this is a heat issue? Nowt in the manual..
Tried some resistors to slow the fan, didn't make much difference to the noise, have ordered a silent fan.
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Post by John on May 25, 2015 14:50:22 GMT
Ali I am a bit worried that it is in red. I had that happen to my first amp when I it got accidentally shorted I had to get a new amp. I did a lot of chasing up and was easier to replace the unit than repair
The above picture both are in orange Ali
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Post by Eduardo Wobblechops on May 25, 2015 17:11:56 GMT
Mine has been fine since I refitted the fan. No worries anyway, any problems and it can go back.
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Post by John on May 25, 2015 18:56:22 GMT
Good to hear Ali
Do you want me to find out what resistor Vic uses
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Post by speedysteve on Jun 20, 2015 4:42:17 GMT
I guess I'd be happier with some low level fan running, resistor value would be good to know / try...
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Post by MartinT on Jun 20, 2015 6:11:32 GMT
Is there any temperature readout, Steve?
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Post by speedysteve on Jun 23, 2015 12:45:46 GMT
Might be if you connect a pc to it I'll have a read.
It doesn't even get warm to the touch in my system though
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Post by Eduardo Wobblechops on Jun 23, 2015 13:37:21 GMT
Good to hear Ali Do you want me to find out what resistor Vic uses Sorry missed this, think it was 100 ohm I used, then paralleled it as I thought it wasn't working, but I think it's just that there's a delay before the fan starts - must be a temp sensing circuit. Not got round to fitting the silent fan yet, will try 100 ohm single resistor first and leave it for longer this time. |
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Post by speedysteve on Jun 28, 2015 12:44:03 GMT
Does not look like there is any temperature readout via PC. Still no problems all cool - still enjoying it immensely  |
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Post by Eduardo Wobblechops on Jun 28, 2015 12:47:12 GMT
Me too, it's doing a grand jobl
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Post by John on Jun 28, 2015 15:19:58 GMT
I am glad the amp has worked out for you guys
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Post by Deleted on Jun 28, 2015 18:04:42 GMT
Next upgrade was a new pair of Mission 700 speakers the original 1980 model, cost £119. Still have them in the garage system:) |
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Post by speedysteve on Jun 30, 2015 15:10:27 GMT
Next upgrade was a new pair of Mission 700 speakers the original 1980 model, cost £119. Still have them in the garage system:)  as garage speakers now, playing mostly R4 they are fine. Not bothered what the cable is there. Back in the day it was QED I think. I did try them in the music room once a couple of years ago. With a good amp - they measured quite flat but sounded pretty dreadful compared to my horn system Back in 1980 I was very pleased with them I remember! |
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Post by Deleted on Jul 3, 2015 8:08:15 GMT
Do you not find them a bit 'dry'? They work best with Mission speaker cable, the ultra fine black sheath variety, have you used them with this? Back in the day it was QED I think. Forgive me for saying this but QED is brilliant; except with Mission speakers.
The Mission speaker cable is the only one that really mesh's with the speakers and plays them at optimum performance. |
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Post by speedysteve on Jul 6, 2015 22:39:31 GMT
Re the fan - A few searches threw up this from hometheatershack...
"The best fix is a simple 2w 120-150R resistor in series with the red lead of the fan. The stock fan will do. This slows the fan down acceptably noise-wise, but still generates sufficient airflow to keep the amp cool in a domestic environment."
I'm plan to test until I get suitable air flow and low noise, in a totally invisible / reversible way...
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Post by MartinT on Jul 8, 2015 5:33:31 GMT
An even better solution is a temperature sensitive thermistor (similar to the ones available for computer fans) which reduces resistance as it gets hot.
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Post by speedysteve on Jul 8, 2015 15:40:45 GMT
An even better solution is a temperature sensitive thermistor (similar to the ones available for computer fans) which reduces resistance as it gets hot. Yeah sounds nice idea, could put it on or very near the pcb if there is room... I'll research. Trick will be the right temp the right resistance!
Meantime 120 to 150R will be in soon. |
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Post by speedysteve on Jul 8, 2015 19:14:55 GMT
Quick update.
150ohm, no way, 100ohm no way!
27 ohm nope! Fan won't self start
13.5 ohm, now were talking.
Starts and is quiet enough not to bother me in room without music.
Could have a pot / knob to start and then throttle back or some other smart solution.
Loathed to spend any money on a new quiet fan, etc...
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Post by MartinT on Jul 11, 2015 9:54:14 GMT
How about one of these 10 Ohm negative temperature coefficient thermistors? You won't need a control knob then, it'll be automatic, just mount it in the air flow. 10 Ohm NTC Thermistor |
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Post by speedysteve on Jul 12, 2015 16:19:35 GMT
Won't break the bank. 3A covers it! Does that mean its 10ohm when cold and R gets less the warmer it gets? If it does then its probably too low a starting point. I've not looked into how these things work yet... |
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as garage speakers now, playing mostly R4 they are fine. Not bothered what the cable is there. Back in the day it was QED I think.