A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input) - Page 43 - diyAudio
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Old 24th June 2013, 09:23 PM   #421
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Join Date: Feb 2013
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,
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Old 24th June 2013, 09:42 PM   #422
xslavic is offline xslavic  Moldova
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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
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Old 25th June 2013, 06:46 AM   #423
AudioH is offline AudioH  United Kingdom
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Join Date: Aug 2011
Location: Swindon
Quote:
Originally Posted by xslavic View Post
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
Sorry dont understand this, there is no opamp in the design.
Regards
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Old 25th June 2013, 06:49 AM   #424
AudioH is offline AudioH  United Kingdom
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Join Date: Aug 2011
Location: Swindon
Quote:
Originally Posted by Supersurfer View Post
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,
Hi Supersurfer
Will buy some of the above recommendations and give them a try
Regards
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Old 25th June 2013, 08:04 AM   #425
IanS1 is online now IanS1  United Kingdom
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Join Date: Jan 2012
Location: UK
Anyone tried these as a replacement for the Riken Carbon?

Amtrans AMGR carbon film Resistors,0.75 watt and 2 watt
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Old 25th June 2013, 10:45 AM   #426
AudioH is offline AudioH  United Kingdom
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Join Date: Aug 2011
Location: Swindon
Quote:
Originally Posted by IanS1 View Post
Anyone tried these as a replacement for the Riken Carbon?

Amtrans AMGR carbon film Resistors,0.75 watt and 2 watt
Don't look too expensive so will to shopping list
Regards
Howard
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Old 25th June 2013, 03:09 PM   #427
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Join Date: Dec 2005
Location: south
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.
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Old 25th June 2013, 04:16 PM   #428
Almeg69 is offline Almeg69  United Kingdom
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Join Date: Mar 2009
Quote:
Originally Posted by spacejay View Post
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 :-)
__________________
Alex H
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Old 26th June 2013, 03:16 AM   #429
tuyen is offline tuyen  Australia
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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!
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Old 27th June 2013, 06:31 PM   #430
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Join Date: Aug 2010
x1
I'm also looking forward to the comparaison...
all the best
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