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Dallas II modification
Dallas II modification
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Old 26th January 2019, 11:59 PM   #41
Ugg10 is offline Ugg10  United Kingdom
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Join Date: Nov 2017
Location: UK
Thanks for that, looks neater than the laptop power supplies strapped in there with the leads coiled up.

Quick google identified either two of these to keep it fully dual mono -
Meanwell 156w 24v smps

RS-150-24 | Mean Well 156W Embedded Switch Mode Power Supply SMPS, 6.5A, 24V dc | RS Components

Looking at similar 250-300w versions, they all seem to need a fan to operate so not ideal for hifi.
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Old 27th January 2019, 01:16 PM   #42
IslandPink is offline IslandPink  United Kingdom
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Join Date: Oct 2005
Are people sure that SMPS will work OK in this application with 98db/w speakers ?
I only ask because I've trialed them as filament supplies for GK-71 DHT valves , and they typically kick out about 30-40mV of HF 'ripple' in the 45-60kHz region. In that application it's definitely audible, as it intermodulates with the HF in the music adding a nasty 'edge' to everything.
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Old 27th January 2019, 09:39 PM   #43
chrisb is offline chrisb
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Maybe drop Tom a PM, or email at his commercial site to discuss his process of selection of specific SMPS heís currently implementing. Itís also worth noting that he offers at least two linear supply options with recommendations for power transformers.

Come to think of it, his 4 channel Modulus 86 I heard almost three years may ago may have been a linear supply?

In either case, he's done the math, much of which I think should be as applicable to ACA as his chip amps.
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Old 29th January 2019, 06:34 PM   #44
IslandPink is offline IslandPink  United Kingdom
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Whereabouts are you in the UK, Ugg10 ?
I keep hoping I can find someone who's built the Dallas's so I can get on with finishing my current 2 or 3 projects, but still hear one in the near future.
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Old 29th January 2019, 07:05 PM   #45
Ugg10 is offline Ugg10  United Kingdom
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Join Date: Nov 2017
Location: UK
Not started the build yet, just in the planning stages, need to finish my classic car restoration first. Probably be a couple of years but next on the project list. My aim is to build an amp and speaker that work together rather than fight each other. My other option is a slim 30-40l 3 way floor standers with dual 6.5 woofers, dome mid and ribbon tweeter linked together with a hypex fusion plate amp. I know they are polar opposites there trying to get as much info on each as possible before I take the plunge.
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