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Old 2nd December 2011, 08:38 AM   #1
ozcal is offline ozcal  Australia
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Default Satch & uvos questions

Hi guys I have a Satch dac with your valve output stage. I am trying to get the best sound possible from the pairing and was wondering if I can take the output lead of the output caps directly to the hot pin of the output rca’s?
Also Thorsten recommended using discrete I/V resistors rather than the ones built into the valve stage. What type and what value of resistor should I use.Where should the discrete resistors be placed and what jumper setting will the valve stage then use.
Thanks in advance,
Gordon
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Old 3rd December 2011, 06:13 PM   #2
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Hi,

Quote:
Originally Posted by ozcal View Post
Hi guys I have a Satch dac with your valve output stage. I am trying to get the best sound possible from the pairing and was wondering if I can take the output lead of the output caps directly to the hot pin of the output rca’s?
If you like, yes. But make sure the capacitors output connection is also returend to the PCB, for the turn on delay to work. The 100V DC Step on turn on you get otherwise may fry gear that follows...

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Originally Posted by ozcal View Post
Also Thorsten recommended using discrete I/V resistors rather than the ones built into the valve stage. What type and what value of resistor should I use.Where should the discrete resistors be placed and what jumper setting will the valve stage then use.
The UTS is fitted with a pair of 100R resistors. For TDA1541 they are used in parallel, so 50 Ohm.

You can use 51 Ohm external (I like Shinkoh Tantalum or Rohpoint NI Copperalloy wirewounds), plus a 10nF capacitor (I like silver mica).

On the UTS the I/V RC is connected to the "Vcom" connection, leave this unconnected (in the Satch it gets linked to ground) and connect the external I/V RC between input and ground.

Ciao T
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Old 7th December 2011, 01:14 AM   #3
ozcal is offline ozcal  Australia
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Thanks Thorsten.
Just for clarity, if I leave the output cap soldered in place at both ends and take a lead from the output wire of the cap to the hot pin of the rca this will have the same effect as having a return to the board from the hot pin.
Couldn't get a 10nf silver mica cap , will 9.4 nf suffice ?
Thanks,
Gordon
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Old 7th December 2011, 01:30 PM   #4
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Hi,

Quote:
Originally Posted by ozcal View Post
Just for clarity, if I leave the output cap soldered in place at both ends and take a lead from the output wire of the cap to the hot pin of the rca this will have the same effect as having a return to the board from the hot pin.

Couldn't get a 10nf silver mica cap , will 9.4 nf suffice ?
Yes and yes...

Ciao T
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Old 9th December 2011, 06:13 AM   #5
ozcal is offline ozcal  Australia
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Thanks T.
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Old 26th December 2011, 06:21 AM   #6
ozcal is offline ozcal  Australia
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Join Date: Jun 2008
Hi Thorsten , got the Shinko's and 9.4nf silver mica's.
I just get hiss with the caps is series with the resistors across 'in' and 'gnd'.
With just the resistors across in and gnd I get sound.
What am I doing wrong with caps and is it ok to run the dac with just the resistors in place.
Thanks in advance,
Gordon
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Old 26th December 2011, 10:33 AM   #7
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Hi,

Quote:
Originally Posted by ozcal View Post
I just get hiss with the caps is series with the resistors across 'in' and 'gnd'. With just the resistors across in and gnd I get sound.
What am I doing wrong with caps and is it ok to run the dac with just the resistors in place.
The cap and resistor need to be in parallel, not in series...

Ciao T
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