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Author Topic: 12 Vd for a fan  (Read 5973 times)
Franc
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« on: August 23, 2009, 02:39:15 PM »
I want to put a 12Vcd computerfan inside the box of a Dizzy30 because it gets very hot.
Ayone has an elegant solution for getting 12Vcd from the amp without too much modification?
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wyatt
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« Reply #1 on: August 24, 2009, 11:40:24 PM »
Been looking into this.  What I found ain't great.

You either need a use a extra transformer (120VAC/12VDC), which is the likely option, or are going to have to get into rectifying the heater current solely for the fan. 

I haven't mentioned this yet, but I'm still a bit worried about all the heat.  There is no reason for the chassis and switches to get too hot to touch.  And if that PT was supplying plenty of current, it shouldn't be getting warm.  It common to have PT's in vintage amps that get warm, but a new build should allow using enough iron to stay cool.
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TeleCasterAndTubes
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« Reply #2 on: August 25, 2009, 09:20:47 AM »
I have bought a 220 volt Fan (are not expensive) for my Creme Brulee . Connect it to the 110 volt tap to make it work slower. No need for a transformer.
« Last Edit: August 25, 2009, 09:50:27 AM by TeleCasterAndTubes » Logged
hywelg
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« Reply #3 on: August 25, 2009, 09:25:43 AM »
Aren't those computer type fans AC? My tech fitted one to my DC-30 for cooling the powerscaling heatsink without installing any transformer. If you supply a lower voltage than required it runs a bit slower and quieter, I hardly notice mine at all, and never whilst playing.
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Franc
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« Reply #4 on: August 25, 2009, 10:25:48 AM »
I removed one from an old PC power unit and it says 12VDC....

Maybe I should find another one then...
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hywelg
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« Reply #5 on: August 25, 2009, 01:34:46 PM »
If they are DC then my amp tech found a way of extracting a supply to run a fan to cool the heatsink. Not sure when i'll get chance (maybe at the weekend) but I'll take some photos of the insides so we can work out how he did it.

You could email Nik and ask?
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wyatt
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« Reply #6 on: August 25, 2009, 04:15:17 PM »
Quote from: hywelg on August 25, 2009, 01:34:46 PM
If they are DC then my amp tech found a way of extracting a supply to run a fan to cool the heatsink. Not sure when i'll get chance (maybe at the weekend) but I'll take some photos of the insides so we can work out how he did it.

You could email Nik and ask?

Unfortunately, DC-30's, like most vintage-amp based designs, uses AC heater current. 

Modern amps, especially high gain ones, rectify the heater current for DC use in the preamp, it's a lot quieter and in an amp with high compression, the noise floor matters a lot more.
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