Krell Studio DA tweaking ADVICE ?

pw8888 · 6th May 2011, 02:09 PM

HI Everybody,
i just bought a Krell studio DA converter
I am REALLY surprised how good it sounds.i have tried MANY--MANY unit and this one really is surprising to me.

Few things i want to ask :

1-Can someone decribe what technologie is used ?
2-Does someone have the schematics ?
3-I would like to "clean" the unit . i mean by that can i would like to upgrade/clean the cap .
4- Can someome help me with what could be uprgaded ?
5- Is there any possibility to uprde the unit ? if yes how ?
6- By Upgrading i mean the high "seems " a bit dry ….a bit i mean….dry caps?
7- is there a way to try another output stage ?
8- and ….finally if anyone has info reagarding the reference64 model compare to this one i would be more than happy to hear story or tech things about it.

the low end of the unit is fantastic.the top is a "little"bit dry.now if by a better power supply or caps or other thing ...or even different chip i could do improvement starting with that base...

thanks for all your advice !!

Phil

guido · 6th May 2011, 05:29 PM

See some motorola DSPs i think; custom digital filter. DACs would be on the right pcb at the bottom (BB or AD). Large analog section.

Wonder if you even should touch it...

pw8888 · 6th May 2011, 08:55 PM

first phase i wanted to be sure to be at the max...and must dry up with the time no ?

pw8888 · 7th May 2011, 05:18 PM

nobody to help me on this ?

remi207 · 9th May 2011, 11:35 AM

Hello,

This Krell DAC is a complex machine, I have some experiences with Wadia X32 and X64.

The first point is the input circuit which may have one or more slow logic gates ( HCU).
See the doc on
TVC Audio- Audio Numeric Performance

The second point is the VCXO that is very important but very more complex to change.

TVC Audio- Wadia X64

You must do the jitter measures on the two part before the modifications and redo the measures after .

Rémi

remi207 · 9th May 2011, 11:41 AM

Hello,

This Krell DAC is a complex machine, I have some experiences with Wadia X32 and X64.

The first point is the input circuit which may have one or more slow logic gates ( HCU).
See the doc on
TVC Audio- Audio Numeric Performance

The second point is the VCXO that is very important but very more complex to change.

TVC Audio- Wadia X64

You must do the jitter measures on the two part before the modifications and redo the measures after .

Rémi

tiefbassuebertr · 9th May 2011, 02:15 PM

Quote:

Originally Posted by pw8888

HI Everybody,
i just bought a Krell studio DA converter
I am REALLY surprised how good it sounds.i have tried MANY--MANY unit and this one really is surprising to me.

Few things i want to ask :

1-Can someone decribe what technologie is used ?
2-Does someone have the schematics ?
3-I would like to "clean" the unit . i mean by that can i would like to upgrade/clean the cap .
4- Can someome help me with what could be uprgaded ?
5- Is there any possibility to uprde the unit ? if yes how ?
6- By Upgrading i mean the high "seems " a bit dry ….a bit i mean….dry caps?
7- is there a way to try another output stage ?
8- and ….finally if anyone has info reagarding the reference64 model compare to this one i would be more than happy to hear story or tech things about it.

the low end of the unit is fantastic.the top is a "little"bit dry.now if by a better power supply or caps or other thing ...or even different chip i could do improvement starting with that base...

thanks for all your advice !!

Phil

Very important is the replacing of the red caps (ROE) on the PCB for power supply/voltage regulation (left hand of the attached pic).

here additional URLs of this device:
Krell Studio DAC ! - ¶ú»úÒôÏìÑÐÌÖ»á - ¶ú»ú¾ãÀÖ²¿ÂÛÌ³ ¶ú»ú,¶úÈû,¶ú·Å,¶ú»úÂÛÌ³,ÒôÀÖ,ÒôÏì - ¶ú»ú¾ãÀÖ²¿
ÍËÉÕ³ö KRELL STUDIO DAC ¶ú»ú´ó¼ÒÌ³ È«Çò×î´óÖÐÎÄ¶ú»úÂÛÌ³

I want also to have a schematic.

pw8888 · 10th May 2011, 11:35 PM

hi
thanks for the advice...i am going to start

tiefbassuebertr · 08:18 AM

for more information arround lifetime from caps, use by Google the term "bad caps" and you will get several proposals, e. g.:
Best electrolytic capacitors
Badcaps Forums - Salvation For Your Hardware!
What happens to cheap Caps after 30 years in a hot console? - Badcaps Forums
Cyrus two - non polar cap
Capacitor Brand Voodoo - Let's clear the air
Krell KSA-250 failure (pic from post #4)

suwaned · 6th July 2011, 09:09 AM

I have kreel studio also, I have a problem with my DAC. which can not lock. I try to replace him but VCXO frequency is 3400 MHz weird. hard to be right. friend said that this jitter problem. but I've unsolder jitter but with the Krell in the cast. circuit can not be viewed. complex digital PCB pathway consists of three lines, really complicated .......
I want to fix it because it couples with the cd transport Krell MD-1

6th May 2011, 05:29 PM	#2
guido diyAudio Member Join Date: Mar 2002 Location: diepe zuiden	See some motorola DSPs i think; custom digital filter. DACs would be on the right pcb at the bottom (BB or AD). Large analog section. Wonder if you even should touch it... __________________ GuidoB

11th May 2011, 08:14 AM	#9
tiefbassuebertr diyAudio Member Join Date: Jul 2005 Location: D-55629 Schwarzerden	for more information arround lifetime from caps, use by Google the term "bad caps" and you will get several proposals, e. g.: Best electrolytic capacitors Badcaps Forums - Salvation For Your Hardware! What happens to cheap Caps after 30 years in a hot console? - Badcaps Forums Cyrus two - non polar cap Capacitor Brand Voodoo - Let's clear the air Krell KSA-250 failure (pic from post #4) Last edited by tiefbassuebertr; 11th May 2011 at 08:18 AM.

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6th May 2011, 08:55 PM	#3
pw8888 diyAudio Member Join Date: Mar 2010	first phase i wanted to be sure to be at the max...and must dry up with the time no ?

7th May 2011, 05:18 PM	#4
pw8888 diyAudio Member Join Date: Mar 2010	nobody to help me on this ?

9th May 2011, 11:35 AM	#5
remi207 diyAudio Member Join Date: Mar 2008	Hello, This Krell DAC is a complex machine, I have some experiences with Wadia X32 and X64. The first point is the input circuit which may have one or more slow logic gates ( HCU). See the doc on TVC Audio- Audio Numeric Performance The second point is the VCXO that is very important but very more complex to change. TVC Audio- Wadia X64 You must do the jitter measures on the two part before the modifications and redo the measures after . Rémi

9th May 2011, 11:41 AM	#6
remi207 diyAudio Member Join Date: Mar 2008	Hello, This Krell DAC is a complex machine, I have some experiences with Wadia X32 and X64. The first point is the input circuit which may have one or more slow logic gates ( HCU). See the doc on TVC Audio- Audio Numeric Performance The second point is the VCXO that is very important but very more complex to change. TVC Audio- Wadia X64 You must do the jitter measures on the two part before the modifications and redo the measures after . Rémi

10th May 2011, 11:35 PM	#8
pw8888 diyAudio Member Join Date: Mar 2010	hi thanks for the advice...i am going to start

6th July 2011, 09:09 AM	#10
suwaned diyAudio Member Join Date: Jul 2011	I have kreel studio also, I have a problem with my DAC. which can not lock. I try to replace him but VCXO frequency is 3400 MHz weird. hard to be right. friend said that this jitter problem. but I've unsolder jitter but with the Krell in the cast. circuit can not be viewed. complex digital PCB pathway consists of three lines, really complicated ....... I want to fix it because it couples with the cd transport Krell MD-1

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