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Old 29th December 2010, 09:20 AM   #5661
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Let's try something with the power supply for 2011. I can see that mostly a dual mono ps is used and I would recommend another version.

Use a stereo power supply for each stage:
a regulated, of course a Salas, low voltage ps for the first stage, another for the 2nd stage and a 3rd for the output stage.

I think that it's better to use a common supply, here called stereo, for each stage with has the same phase instead of a common supply for each channel.

My experiences with such a supply result in more inner detail and inner dynamic of music reproduction.
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Old 29th December 2010, 10:22 AM   #5662
massimo is offline massimo  Italy
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Quote:
Originally Posted by Joao@AltheaMusica View Post
Let's try something with the power supply for 2011. I can see that mostly a dual mono ps is used and I would recommend another version.

Use a stereo power supply for each stage:
a regulated, of course a Salas, low voltage ps for the first stage, another for the 2nd stage and a 3rd for the output stage.

I think that it's better to use a common supply, here called stereo, for each stage with has the same phase instead of a common supply for each channel.

My experiences with such a supply result in more inner detail and inner dynamic of music reproduction.
Splitting each single channel PS into three is definitely a good idea, but I do mind the polar bear!
Let's take a 200+200 mA CCS setting: now becomes 600+600 mA or 1.2A in total. With 45 V, equals to over 50 watts power consumption for a stereo circuit drawing around 2 watts (AndrewT will rectify my math) that is 5 % (95% wasted!)
It can be done, I guess, using a single ccs set for 200-300 mA per channel followed by three shunt devices + error amps. Each new shunt circuits separated by low ohm resistors.

Last edited by massimo; 29th December 2010 at 10:24 AM.
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Old 29th December 2010, 10:29 AM   #5663
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Originally Posted by vgeorge View Post
Merlin, just measured 40pF for the two meters. It is silver foil, teflon insulation and the conductors spaced appart.
Salas, I have lots of rg174 leftovers from other projects. Maybe will try them in the future. Also I will make a short interconnect from a VDH D502 cable I have and see the difference
I'm just curious could you post a picture, are DIY or a brand?
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Old 29th December 2010, 01:07 PM   #5664
AndrewT is offline AndrewT  Scotland
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Originally Posted by SGregory View Post
I don't have shielded output wire either. iMHO it is better to avoid it if you can to minimize capacitance. I usually don't run shielded interconnect either. only when I have to.
large diameter (6mm to 9mm) coax is usually less capacitance than close coupled twisted pair and certainly less than close coupled star quad.
Small diameter (3mm to 5mm) coax will have higher capacitance than large coax but probably still less than a twisted pair.
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Old 29th December 2010, 01:45 PM   #5665
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Here is something of interest regarding coax. I keep it close by to reference.
RF Cafe - Coaxial Cable Specifications Cables Chart

I use rg59/U at time since it is available at the local electric supply store when I need it.
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Old 29th December 2010, 01:52 PM   #5666
AndrewT is offline AndrewT  Scotland
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the evidence in post5665 completely refutes my assertion of capacitance related to diameter of coax. Ignore my post5664 re coax
It is D/d that controls capacitance.
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Last edited by AndrewT; 29th December 2010 at 01:58 PM.
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Old 29th December 2010, 02:00 PM   #5667
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AndrewT,
In general I thought the link supports your analogy. For a given dielectric it is true.
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Old 29th December 2010, 02:08 PM   #5668
vgeorge is offline vgeorge  Greece
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Originally Posted by merlin el mago View Post
I'm just curious could you post a picture, are DIY or a brand?
Merlin, check here: 99.99 SOLID SILVER FOIL RCA INTERCONNECT CABLES .5M - eBay (item 180605660717 end time Jan-03-11 12:21:41 PST)
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Old 29th December 2010, 02:17 PM   #5669
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How are those interconnects?
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Old 29th December 2010, 03:01 PM   #5670
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Are the same are you using?
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