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ogie

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  1. Hey everyone... glad to see this thread bumping along. Its been a while since I posted about my Sowter I/V upgrade. I thought I would mention a few things as my DAC is sounding fabulous. The switch from AN Copper coupling Caps to the other various Caps (take your pick) is a must do. I love the my Sowter I/V's and highly recommend as a great bang for the buck upgrade. I also got a nice bump in sound quality w the addition of an ART-Legato 24/96 SPDIF/USB converter. It was a further extension of the AN DAC sound of smoothness, dynamics and unfatiguing organics. I've been around the block w converters and this one is a keeper. I have also switched out a handful of power cords and haven't had anything blow me away or have much impact on SQ. It probably has to do w all the tranny's. I am currently using a low priced Neotech Shielded Copper NEP something. I've taken this DAC about as far is she needs to go... w the only thing I've been thinking about is maybe some silver wiring. Any thoughts?
  2. I hope not, they would ruin it! They do not like the consumers owning media. Right now, ROON is the best of both worlds in that it is great for having your own library and streaming with tidal (which could be replaced by any number of other cos. if it they cant make it).
  3. Hey Fellas, I wanted to follow up on the Sowter install and let you know that after listening for a month or so - that I am very happy with the results. I'll probably give it another month or so and then start thinking about upgrading the caps and possibly the power supply board. Thanks for the help..
  4. Below is Brian Sowter's comments along w an attachment: Excellent! We have established that you must be using the Iout terminal(s) Pins 21 and 4 for the L and R channels. The DAC puts out +/- 1mA peak to peak. This equates to an rms current of 0.71 mA. Don’t worry about this point but generally is easier to work with volts and amps rms which is what you measure with a volt meter or ammeter. We have been working with DAC’s for 20 years too and we recommend a step up transformer not a 1:1! We have sold literally hundreds of step-up transformers for DACs. So the good news is that our type 1465 is the ”correct” transformer at least if you follow our recommendations. Now for the choice of I/V resistor. First you need to wire the 1465 with the primary windings in parallel and the secondary windings in parallel giving you a simple 1:5 transformer with a very high bandwidth. Connect the primary between pin 21 (or 4) and ground with NO resistor in parallel. You then connect the I/V resistor across the SECONDARY of the transformer. See attachment. Second you need to decide what voltage out you need. I suggest you go for 1.0V. Now for the calculation: 0.71 mA (=0.00071 Amps) in the primary is 0.00071 / 5 = 0.000142 Amps from the secondary. By ohms law ( R=V/I remember?) the I/V resistor you need to get 1.0 V, R = 1 / 0.000142 = 7042 Ohms. On our site we recommend 6.8K which is close enough. Hope this helps Best regards Brian sowter 1465 attachment.pdf
  5. Fellas... Thanks for the input. I have resisters on order and will report back. Also... I have been conversing w Sowter and they have question I'm not able to answer. Does anyone know: "Do we yet know if you are using Iout or Vout. Are you connecting to Iout (pins 21/4) or Vout (pins 17/8)?" Thanks- Doug
  6. "I have a very old AN DAC4 which I am still using and find it hard to replace because of its excellent SQ. However as it was bought so long ago and using PCM63Pk chips, I thought it might be possible to upgrade the digital board and some vital components such as transformers and capacitors. I attach some images of the interior of the DAC and hope to get some suggestions of how to go about upgrading this DAC" My guess is that upgrading your DAC wouldn't make financial sense. But maybe upgrading a key cap or two might be worthwhile. I can't see your caps but it looks like you have lots of BlackGates... which is a very good thing.
  7. Thanks for your thoughtful answer. Your hunch that is a ANK board is correct. I put in a request to Sowter for input and output loading requirements as you suggested. What Sowter lacks in expedience they make up for in quality when it comes to support. So, hopefully I'll hear from them soon. Sowter has section titled "How to calculate I/V resister" on this spec sheet. A couple of quotes from this source- which I'm not sure is relevant or not?? - "Provides current to voltage conversion with gain to achieve at least a line level signal (0 dBu 0.775V) depending on the I/V resistor used." " Configuration: Primary coils in parallel. Seconday coils in parallel. Ratio = 1:5 For line level out use 3.3K Ohms secondary load. For increased output level increase load in proportion." I hate to be such a plebe but when it comes to digital schematics or transformer math, I'm a bit clueless. I plan to tackle your power supply next, but need to get the right resister in here first. Thanks again for sharing your experience and taking the time to help. You're a Prince! FYI- more pics.
  8. Hi, Thanks much for posting your AN DAC journey. Very inspirational! There's just not a lot of AN DAC modding discussion on the web. I'm hoping to get some advice after installing a Sowter 1465 IT Tranny. The output is much weaker and I'm not sure which resistors to change.
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