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Valve DAC from Linear Audio volume 13
Valve DAC from Linear Audio volume 13
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Old 11th June 2017, 07:50 AM   #1
MarcelvdG is offline MarcelvdG  Netherlands
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Default Valve DAC from Linear Audio volume 13

Hi all,

I was wondering if anyone considers building the valve DAC from Linear Audio volume 13 (which is not a solid-state DAC with a valve-based output buffer, but which uses E88CC valves as the actual DAC). If so, I would be very willing to answer any questions about it.

If there is more than one person who wants to build it, you can save a considerable amount of money on the main PCB by ordering it together. I also have a filter PCB available for anyone who wants it. It has an incorrect transformer footprint, but that is easily corrected by scratching some tracks.

Best regards,
Marcel
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Old 11th June 2017, 07:54 AM   #2
JPS64 is offline JPS64  Germany
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Valve DAC from Linear Audio volume 13
schematics?

JP
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Old 11th June 2017, 08:54 AM   #3
LinuksGuru is offline LinuksGuru  Europe
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Quote:
Originally Posted by JPS64 View Post
schematics?
Copyrighted material, unfortunately, only Linear audio and/or original designed can share schamatics.

Last edited by LinuksGuru; 11th June 2017 at 08:57 AM.
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Old 11th June 2017, 08:55 AM   #4
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by JPS64 View Post
schematics?

JP
Full article: https://linearaudio.net/article-detail/2284

Jan
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Old 12th June 2017, 06:30 PM   #5
mbrennwa is offline mbrennwa  Switzerland
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This is cool stuff! Iwoot!
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Old 12th June 2017, 10:00 PM   #6
MarcelvdG is offline MarcelvdG  Netherlands
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Does that mean you are going to build yourself one?
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Old 13th June 2017, 12:12 AM   #7
thuanth43 is offline thuanth43  Viet Nam
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Depending on the price of the board(s), I'm very interested in building one. There's a local PCB shop that offers great quality and price...
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Old 13th June 2017, 04:37 AM   #8
MarcelvdG is offline MarcelvdG  Netherlands
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The main PCB is a rather large (264.16 mm by 328.93 mm) four-layer PCB. At Eurocircuits, it costs euro 328.74 including VAT when you order a single PCB (PCB proto service). When you order more, the price per board drops quickly:

euro 259.04 each when you order two PCBs
euro 145.27 each when you order five PCBs
euro 156.26 each when you order six PCBs (when you order more than five, they go to standard service rather than proto service)
euro 113.38 each when you order ten PCBs

Of course you can order it somewhere else. When the prepreg thickness is very different from the 360 um that Eurocircuits uses, the values of some termination resistors need to be changed.

Other expensive parts are the optional two output transformers, Jensen JT-11SSP-7MPC (see Line Input | Jensen Transformers), and the FPGA board, the LX75 variant of the Trenz TE0630 module (see https://shop.trenz-electronic.de/de/...al-Temp.-Range).

The least expensive version of the valve DAC is the single-ended variant; it has no output transformers and half the potcores.

Last edited by MarcelvdG; 13th June 2017 at 04:39 AM.
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Old 13th June 2017, 05:10 AM   #9
MarcelvdG is offline MarcelvdG  Netherlands
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By the way, when you order the FPGA module from Trenz, don't forget to also order a JTAG programming cable (unless you already have one) and the two connectors needed to connect the module to the main PCB.
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Old 23rd June 2017, 09:49 PM   #10
MarcelvdG is offline MarcelvdG  Netherlands
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No replies in ten days, so I guess it's simply too expensive...

Well, at least tweaking the digital part is cheap; with an FPGA you can try as many filter coefficient sets and algorithms as you like by just changing the FPGA's configuration file.

Last edited by MarcelvdG; 23rd June 2017 at 09:57 PM.
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