DAC Hifidiy Olympic PCM1798 assembly and problem - Page 4

Mayday · 7th February 2012, 05:11 PM

Don't know what could cause it, but I wouldn't play it on those nice speakers before I knew it was harmless. Have you measured the DC on DAC outputs? That is from signal to gnd? example right signal to right gnd etc.

mati1979 · 7th February 2012, 05:33 PM

Quote:

Originally Posted by Mayday

. Have you measured the DC on DAC outputs? That is from signal to gnd? example right signal to right gnd etc.

Dear Mayday, you tell this measured ?

mati1979 · 7th February 2012, 05:38 PM

a volume is normal compared to my cd player.

Mayday · 7th February 2012, 05:38 PM

You are measuring AC in the picture, not DC.
To be honest I'm not 100% sure I remember the "maximum" value, but it should be below 10mV I THINK. Someone might step in here, because I'm not sure that I remember correctly.

Mayday · 7th February 2012, 05:43 PM

I have only just started learning about tubes. COULD the problem come from the tube picking up interference from something? Transformer or something like that?
Is everything grounded as the instructions say?

mati1979 · 7th February 2012, 09:32 PM

i have found a problem

a problem is with 1 USB IN from my old pc

now a USB DAC works veryyy smooth

Mayday · 8th February 2012, 08:23 AM

Great

Sometimes we get lucky and the problems are easily solved

hyperma · 10th February 2012, 02:36 PM

I personally strongly not recommend that using this device on USB connection mode.This pcb was designed for people who wanna listen to hi-resolution music,so the coxial connecter should be used.

The tube 6N11 equivalent to ECC88 or 6922,but please keep this tube in hand even replaced by some expensive tubes like Mullard or Telefonken.Only a few 6N11 tubes you can find in China.

mati1979 · 13th February 2012, 01:00 PM

Hi, ask: If i want improve my DAC, which components can be modified ? 2 Caps Bennic ?
A Kit comes with 2 Bennic, i see, this caps are chips.
And whats about Crystal 1ppm and Dac 1794 ? (i can replace a Crystal 3ppm default and 1798 , this upgrade - crystal - dac is really better in a quality sound ? or with 2 caps Mundorf i can improve more ?

thanlk you

7th February 2012, 05:11 PM	#31
Mayday diyAudio Member Join Date: Mar 2004 Location: Sweden	Don't know what could cause it, but I wouldn't play it on those nice speakers before I knew it was harmless. Have you measured the DC on DAC outputs? That is from signal to gnd? example right signal to right gnd etc. __________________ The more you learn, the more you realize how little you know... Mayday DIY blogg

7th February 2012, 05:38 PM	#34
Mayday diyAudio Member Join Date: Mar 2004 Location: Sweden	You are measuring AC in the picture, not DC. To be honest I'm not 100% sure I remember the "maximum" value, but it should be below 10mV I THINK. Someone might step in here, because I'm not sure that I remember correctly. __________________ The more you learn, the more you realize how little you know... Mayday DIY blogg

7th February 2012, 05:43 PM	#35
Mayday diyAudio Member Join Date: Mar 2004 Location: Sweden	I have only just started learning about tubes. COULD the problem come from the tube picking up interference from something? Transformer or something like that? Is everything grounded as the instructions say? __________________ The more you learn, the more you realize how little you know... Mayday DIY blogg

8th February 2012, 08:23 AM	#37
Mayday diyAudio Member Join Date: Mar 2004 Location: Sweden	Great Sometimes we get lucky and the problems are easily solved __________________ The more you learn, the more you realize how little you know... Mayday DIY blogg

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7th February 2012, 05:38 PM	#33
mati1979 diyAudio Member Join Date: Jul 2009	a volume is normal compared to my cd player.

7th February 2012, 09:32 PM	#36
mati1979 diyAudio Member Join Date: Jul 2009	i have found a problem a problem is with 1 USB IN from my old pc now a USB DAC works veryyy smooth

10th February 2012, 02:36 PM	#38
hyperma diyAudio Member Join Date: Oct 2008	I personally strongly not recommend that using this device on USB connection mode.This pcb was designed for people who wanna listen to hi-resolution music,so the coxial connecter should be used. The tube 6N11 equivalent to ECC88 or 6922,but please keep this tube in hand even replaced by some expensive tubes like Mullard or Telefonken.Only a few 6N11 tubes you can find in China.

13th February 2012, 01:00 PM	#39
mati1979 diyAudio Member Join Date: Jul 2009	Hi, ask: If i want improve my DAC, which components can be modified ? 2 Caps Bennic ? A Kit comes with 2 Bennic, i see, this caps are chips. And whats about Crystal 1ppm and Dac 1794 ? (i can replace a Crystal 3ppm default and 1798 , this upgrade - crystal - dac is really better in a quality sound ? or with 2 caps Mundorf i can improve more ? thanlk you

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