A new, high quality PCB board is now supplied as standard. This is because many of the less experienced builders have had problems building it correctly and too long has been spent supporting them - making it non cost-effective. Information Update: I have been informed that the hard-wired analog board has been dropped as a standard option. I believe that the Audio Note finished product DAC's up to and including their Level 3 DAC's use these same valves. This signature version also has Copper Foil output capacitors, tantalum resistors and Black Gates. This board uses an individually heated 6922 valve per channel in SRPP mode. The analog board is silver hard-wired (although there is a PCB version going to be made available for a simpler build). This adds on some Black Gates and a Digital Input Transformer to the digital board. this one) comes with the Signature Digital Board. The second is that the Crystal CS8414CP input receiver is used instead of the older CS8412CP. The first change is that there is now no analog filter - just like the latest production model DAC's from Audio Note. The digital board is very similar to the one in my DAC Kit 1.1 with a few changes. The two power supplies are even switched on and off independently - yes, there are two mains switches. This means that there are a total of two mains transformers. The M2 power supply board uses both a 6X5 and ECL82 tube for rectification and current regulation respectively. This uses the AudioNote Trans 0103 Mains transformer/Choke combination and Audio Note's M2 power supply board taken, I believe, directly from one of their production models. The analog PSU is same M2 power supply that is used in the Kit1 Phono Stage Signature that I built previously. The digital PSU is actually the one from the older DAC Kit 1.1 that used to be used for the entire DAC. It sports two separate power supplies one dedicated to the digital section and one dedicated to the analog section. Who would have thought that Audio Note would have allowed such a kit to see the light of day. This really is an exciting new product - one that I thought I would never see, in fact. Instead, however, I decided to go for an entirely new build as I am trying to get together enough components for a decent second system. I could have upgraded by DAC Kit 1.1 to the new one as there is an upgrade package coming out soon (check with AudioNote Kits) that will upgrade either a DAC Kit 1.1 or 1.2 to the new 2.1 (including new chassis). I was originally waiting for official upgrades to be released for my DAC Kit 1.1 but instead, the DAC Kit 2.1 was released. My TX has no center taps, i realize i can 'fake' this by using 2x100r 2w resistors to make a center point.This section takes you through the build of the newly released DAC Kit 2.1. The ip valve has this at 0v, and the SRPP valve has this elevated to 85v, This seems odd, i always thought it best to have the shortest link between the PSU caps and the main PSU 0v point.Īlso in the Audionote mains TX each heater winding has a center tap, (if this doesn't make sense i can draw it) Instead a + and 0v wire are taken to the main signal PCB, which makes it's way to the signal board star earth, which is then returned to the PSU star earth via a single wire. The outputs for 395 and 375v are from the main B+ via dropping resistors and caps, but the final smoothing cap does not have it's -ve terminal returned to the star earth on the PSU board, There is a strange arrangement in the PSU, Pushing on with the build, hopefully complete next week,
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