Hi Howard,
I have three resistor types that have sticked to my (tube) designs since the last 20 years. After dropping metal film (all types), holco, caddock, mills and such.
The ones that sticked and can be used for the dac are:
-allen bradley and even better; riken carbon
-tantalum, shinkoh or audio note ( second choice).
Third type is a wirewound power resistor not suited for the dac.
The carbon is best in series with signal; grid stopper and attenuator.
The tantalum is best connected to ground; grid leakage, attenuator to ground.
All resistors have their strengths and must be used in the right position.
Also each type has it's own sound, so the sound balance will change for better or worse and that has nothing to do with price or quality of the resistors.
Higher wattage is usually better because it is more temperature stable and has less resonance due to the size.
For this application I would use the tantalum. I will try this in the future.
Please keep us posted on your findings.
Regards,
I have three resistor types that have sticked to my (tube) designs since the last 20 years. After dropping metal film (all types), holco, caddock, mills and such.
The ones that sticked and can be used for the dac are:
-allen bradley and even better; riken carbon
-tantalum, shinkoh or audio note ( second choice).
Third type is a wirewound power resistor not suited for the dac.
The carbon is best in series with signal; grid stopper and attenuator.
The tantalum is best connected to ground; grid leakage, attenuator to ground.
All resistors have their strengths and must be used in the right position.
Also each type has it's own sound, so the sound balance will change for better or worse and that has nothing to do with price or quality of the resistors.
Higher wattage is usually better because it is more temperature stable and has less resonance due to the size.
For this application I would use the tantalum. I will try this in the future.
Please keep us posted on your findings.
Regards,
why so? 4 resistors cost more,and the ground cant be so clean
anyway you take reference right at the opamp from pin6 to gnd ith Rfeedback
can you tell me the reasoning for it. ? thanks
anyway you take reference right at the opamp from pin6 to gnd ith Rfeedback
can you tell me the reasoning for it. ? thanks
Hi Supersurfer
Will buy some of the above recommendations and give them a try
Regards
Anyone tried these as a replacement for the Riken Carbon?
Amtrans AMGR carbon film Resistors,0.75 watt and 2 watt
Amtrans AMGR carbon film Resistors,0.75 watt and 2 watt
is dd on holiday at the moment? i emailed him a question and ordered a kit from him last week and have heard nothing back from him since.
Doede is travelling around with work at the moment, replies will be as he gets a chance 🙂
Looking forward to reading about the comparos IanS1.
As currently just running a single board and with funds for hifi being quite limited for the foreseeable future, bit undecided of which direction to go to maximize the performance of the kit.
Cheers!
As currently just running a single board and with funds for hifi being quite limited for the foreseeable future, bit undecided of which direction to go to maximize the performance of the kit.
Cheers!
First impressions are good with the Tent regs but we need more testing as we're not currently testing like for like, PSU/Source differences. Give me a few weeks and I'll hopefully have more time for testing and two exact same sources/DDDAC/PSU's.
Hello, sorry to quote an old post, and sorry if the answer is already somewhere else in the thread.
Using XLR output, I would have put a capacitor on Pos output and another one on Neg output.
Is it not needed? Only one capacitor on Pos output is enough?
Thanks!
Hi Grael,
When you use matched IV resistors you will probably have no DC on the output of the dac. In that case it is best not to use a capacitor at all, sounds MUCH better.
When you have DC than there are two ways; use two capacitors on each output (expensive and not optimal sound) or balance the IV resistors 😉
Regards,
When you use matched IV resistors you will probably have no DC on the output of the dac. In that case it is best not to use a capacitor at all, sounds MUCH better.
When you have DC than there are two ways; use two capacitors on each output (expensive and not optimal sound) or balance the IV resistors 😉
Regards,
Thanks supersurfer!
Does anyone have the output schematics with resistor values to set balanced outputs with just one dac board? 😀
Does anyone have the output schematics with resistor values to set balanced outputs with just one dac board? 😀
Its on the schematic from Doedes site to the top right there is a yellow table. For one board you need 133ohm, two for each channel.
Regards,
Thanks again!
So, with quality resistors with less than 1% tolerance, balanced outputs without any capacitor is achievable. Great!
So, with quality resistors with less than 1% tolerance, balanced outputs without any capacitor is achievable. Great!
i/v resistor
traditionally i am a big friend of the rhopoint wire-wound resistors but the vishay-dale cmf series that comes with the dddac kit is actually a very good resistor for audio application and i am very happy with them in my dac. however, last week i had the chance to test the vishay z foil / bulk metal resistors (vta-54zt and var-t series) and i have to say that they do an excellent job in this application, especially, the "var" type.
the var type is more expensive than the rhopoint but it is definitely worth a try; very detailed and very natural !
anyone else who tried them?
traditionally i am a big friend of the rhopoint wire-wound resistors but the vishay-dale cmf series that comes with the dddac kit is actually a very good resistor for audio application and i am very happy with them in my dac. however, last week i had the chance to test the vishay z foil / bulk metal resistors (vta-54zt and var-t series) and i have to say that they do an excellent job in this application, especially, the "var" type.
the var type is more expensive than the rhopoint but it is definitely worth a try; very detailed and very natural !
anyone else who tried them?
Attachments
according to the resistor structure/design and the data sheet var and vta series should be non-inductive / non-capacitive over a wide range.
http://www.partsconnexion.com/prod_pdf/vishay_var.pdf
Thanks to all for keeping on with experiments !!
Indeed, I am a lot away for business these days. Now I am home for a few days and will give first priority to sending kits. 99% sure, all open orders (without USB Board) will be shipped tomorrow morning!. Every one gets an individual mail of course.
Orders including the USB Board will be shipped end of this week (big batch on its way to me (Thanks Lucian, for hard work!)
I have like 200 open emails in the audio box, so will answer these as I have time (today tomorrow etc)
Things will be better starting mid July 😉
Indeed, I am a lot away for business these days. Now I am home for a few days and will give first priority to sending kits. 99% sure, all open orders (without USB Board) will be shipped tomorrow morning!. Every one gets an individual mail of course.
Orders including the USB Board will be shipped end of this week (big batch on its way to me (Thanks Lucian, for hard work!)
I have like 200 open emails in the audio box, so will answer these as I have time (today tomorrow etc)
Things will be better starting mid July 😉