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A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
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Old 22nd February 2020, 12:02 AM   #7671
smooth dancer is offline smooth dancer  Norway
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Join Date: Mar 2011
Siver tants is still impressive. Lots of detail and no sign of listening fatigue yet, it sounds more analog without being dull.
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Old 22nd February 2020, 12:31 AM   #7672
carlsor is offline carlsor  United States
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Join Date: Jan 2008
Location: Saint Augustine, FL
A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
Default Rhopoint GG102

Quote:
When talking about I/V resistors. Have anyone of you tried these: General Resistance GG102 Squaristor Series | Rhopoint Components
A couple of years ago I bought a bunch of custom value 0.1% 133ohm Rhopoint GG102 resistors for myself and some of my single board DAC friends. Very transparent and neutral sounding without any edginess. They cost about $10 each including shipping, but it took two months to get them. Four needed for DAC board. Wattage rating too low for multiple DAC board loads.

As shown in the picture, I eventually made my own custom DAC boards with a buffer on the main board and ADM7150 Vreg circuits for the digital components and digital side of the PCM1794 chips. I use external Salas 1.3 version power sources for all analog devices. Very analog sounding.
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Last edited by carlsor; 22nd February 2020 at 12:56 AM.
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Old 22nd February 2020, 09:19 AM   #7673
eduard is offline eduard  Netherlands
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Join Date: Sep 2002
Location: Holland
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[QUOTE=Terry Demol;6093648]Chassis looks awesome. Did they laser cut or punch it?

Edit, I can see they punched i

Hello Terry,
Sure i punched on a CNC machine at work. Using 13 different punch tools. Only the big round holes that would be visible like the 39 mm circle for the rectifier are made with one tool 39 mm in one stroke because it looks nicer. The big rectangular holes are made with square tools like 8/15/20/30/40 mm in several strokes. Only 8 mm is one that is not standard in every day use so takes a few minutes to prepare it. Holes like round 3/3,2/4/5/7/10 are always ready to be used. So usually the preparation of the machine would take 5 minutes to 30 min. maximum.
What is really time consuming is getting all the dimensions right.
The stainless steel part that is glued onto the terminal side takes a few minutes to '' design '' . I will write down ( no PC) the dimensions needed for mounting, the 5 M6 studs and the two holes for the terminal to pass. THEN have to program it on the exact position on the chassis. Same like the tube rectifier and the aluminium 57 mm circle. I dont have a cad/cam program on my pc at home so have to visualize it in my mind mainly. Sometimes when the holes are a bid odd like the panelmeter i will just do a test to find out the right combination of dimensions.
About 40% of the copper sheet ends up as scrap. It is to expensive to make a second attempt.
I must confess i like the looks too. All the metal elements on top will be stainless steel except the big Russian capacitors. They have an ugly colour so i will remove the paint and leave them with an ordinary steel look. Once polished and not being touched they will keep that look.
Same like the polished copper. Can be maintained by the same product they use for brass instruments
Greetings, eduard
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File Type: jpg 20191116_122158.jpg (84.0 KB, 98 views)
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