Hi,
I am wondering if anyone could give me an advice, regarding my Pink Triangle DaCapo DAC. Purchased a few years ago on Ebay, from the beginning I had some problems with it.
After listening for a some time, I get some kind of noises, that sounds like electrostatic discharge. After a few minutes, I get pink noise in both channels. One can still hear the music in the background, but I have to turn the unit off. If I turn it on after let us say five minutes, I can listen to it again. This period of time was originally a month, later a week, now it is only two hours or so.
Any idea, or comment would be much appreciated.
Thank you,
Attila
I am wondering if anyone could give me an advice, regarding my Pink Triangle DaCapo DAC. Purchased a few years ago on Ebay, from the beginning I had some problems with it.
After listening for a some time, I get some kind of noises, that sounds like electrostatic discharge. After a few minutes, I get pink noise in both channels. One can still hear the music in the background, but I have to turn the unit off. If I turn it on after let us say five minutes, I can listen to it again. This period of time was originally a month, later a week, now it is only two hours or so.
Any idea, or comment would be much appreciated.
Thank you,
Attila
Dear Attila,
I'm sorry to hear about the problems you’re having with your Dacapo, the original design is now over 12 years old.
You don't mention which version of digital filter you have, very early versions of the TDA1307 filter could have timing violations, which require a modification of the filter modules PLL section.
If you’re not using an early version of the TDA1307 filter then suspect Tant caps in the PSU or PLL circuits going leaky - from experience I no longer use Tant caps. in my designs.
Due the complexity of the design, and the test equipment required to service the unit - I do not recommend 3rd party servicing.
Keep your fingers crossed that the fault does not lay under the "potted" discrete DAC section / final PLL.
If you’re interested, contact me by PM and I could arrange to have a look at your unit.
John Westlake
I'm sorry to hear about the problems you’re having with your Dacapo, the original design is now over 12 years old.
You don't mention which version of digital filter you have, very early versions of the TDA1307 filter could have timing violations, which require a modification of the filter modules PLL section.
If you’re not using an early version of the TDA1307 filter then suspect Tant caps in the PSU or PLL circuits going leaky - from experience I no longer use Tant caps. in my designs.
Due the complexity of the design, and the test equipment required to service the unit - I do not recommend 3rd party servicing.
Keep your fingers crossed that the fault does not lay under the "potted" discrete DAC section / final PLL.
If you’re interested, contact me by PM and I could arrange to have a look at your unit.
John Westlake
Dear John,
Thank you for your reply. I am very honored to talk to the designer himself.
Thank you for offering to have a look at the unit, but we may not live in the same city. I live in Toronto, Canada and I think PT is a London based company. However I love this DAC so much, I would not mind sending it to you to have a look at it.
But first here are some details:
S/N : 95/006/20 (inside)
S/N : 50895 (outside)
Rev: 1.02
Yes, I use the 1307 filter module, but that must be ok, as I got the 18bit one, and the problem persisted after replacing it.
As in Canada we have 120V/60Hz , I have to use a step up transformer. I also have no grouding to the unit. Could that be the source of the problem?
I replaced the electrolytic capacitors with Rubycon ones, but no change.
Also noticed, that one of the transformers (the one close to the power inlet) runs much warmer than the other two. Not sure why.
You can also contact me at my home email address: gruberattila@sympatico.ca
Thank you for all your help.
Attila
Thank you for your reply. I am very honored to talk to the designer himself.
Thank you for offering to have a look at the unit, but we may not live in the same city. I live in Toronto, Canada and I think PT is a London based company. However I love this DAC so much, I would not mind sending it to you to have a look at it.
But first here are some details:
S/N : 95/006/20 (inside)
S/N : 50895 (outside)
Rev: 1.02
Yes, I use the 1307 filter module, but that must be ok, as I got the 18bit one, and the problem persisted after replacing it.
As in Canada we have 120V/60Hz , I have to use a step up transformer. I also have no grouding to the unit. Could that be the source of the problem?
I replaced the electrolytic capacitors with Rubycon ones, but no change.
Also noticed, that one of the transformers (the one close to the power inlet) runs much warmer than the other two. Not sure why.
You can also contact me at my home email address: gruberattila@sympatico.ca
Thank you for all your help.
Attila
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