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Old 3rd October 2010, 06:24 PM   #121
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Originally Posted by fred_com View Post
Hi guys

Is there any proven circuit for connecting 600:600 transformers (I'm using UTC A-20's) to the Buf II? Just straight from the output to the primaries? And what about the secondaries - RC filter, or just a resistor?

Thanks,
Fedor
Hi Fedor

Just as an experiment I am trying UTC A-20's on the IVY 3 as balanced to SE converters connected to the balanced outputs. I realize this goes against the TP design philosophy but it's just for fun. It works well anyhow apart from a slight buzz. I'm wondering should I connect the balanced output GND to the UTC A-20 GND pin?

Below is the filter setup I am using for secondaries. The primary resistor values can be played around with to suit. The transformers are configured as 1:1 -

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Old 4th October 2010, 11:45 AM   #122
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Quote:
I realize this goes against the TP design philosophy
How so?
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Old 5th October 2010, 04:30 PM   #123
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Originally Posted by RichLund View Post
Hi Fedor

Just as an experiment I am trying UTC A-20's on the IVY 3 as balanced to SE converters connected to the balanced outputs. I realize this goes against the TP design philosophy but it's just for fun. It works well anyhow apart from a slight buzz. I'm wondering should I connect the balanced output GND to the UTC A-20 GND pin?

Below is the filter setup I am using for secondaries. The primary resistor values can be played around with to suit. The transformers are configured as 1:1 -
Hi Rich,

Sorry, I can't answer your question, I don't have an I\V stage, and right now I've just connected +/- terminals of the DAC straight to the transfomer primaries. I'm using the same filter on the secondaries (left from when UTC's were connected to the Gigaworks Dac).

Thanks,
Fedor
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Old 5th October 2010, 08:11 PM   #124
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Hi Fedor

Sounds like we are beating the same track. I also have the Giga DAC which I used the A-20's on. It made a massive difference to that DAC but only slight difference when used with the Buffalo IVY.

I have been switching between the standard IVY SE outputs and the the transformer outputs and I have to say I quite like the transformers. A warmer, analogue presentation. Slight loss of ultimate clarity maybe but very comfy. I may sell the A-20's and try Jensen JT-11-EMCF or some Onetics. I have also connected the signal GND to the GND tab of the A-20's and it reduced the hum significantly.

Are you using resistors on the primaries when direct to the Buffalo?
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Last edited by RichLund; 5th October 2010 at 08:15 PM.
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Old 5th October 2010, 11:01 PM   #125
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Connecting the signal GND to the chassis fixed the hum for me. Maybe I should try the transformer GND instead, sounds like a better idea.
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Old 6th October 2010, 09:56 AM   #126
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Hi Rich

Thanks for the tip about connecting A-20's GND to the Buff II output GND - just tried this using a wire, and hum level is indeed reduced a lot.

I'm not using any resistors on the primaries at the moment. Actually, I'm unsure what resistors values to use and how to connect them, if they are needed.
There's one circuit I wanted to try, and maybe will do it later. Other than that, I'm stumped.

<offtopic> BTW, thanks for the idea of VREF mod on Giga DAC - it made a final point in the series of the mods on this great DAC. </offtopic>

Fedor
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Old 15th October 2010, 10:56 AM   #127
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Hello Folks!

I used the Lundahl LL1690 with the Gigawork (CS4398 and CS4397 versions) with huge results. In that case I connected the trafo as suggested by Per Lundahl, tha is: dac connected to the trafo with no additional components, a single 7K resistor across pin 9-10, pin 3 grounded... that's it!!!!

Le me ask some questions:

1. If I understood right the Buffalo doesn't need a SPDIF receiver, is that correct?

2. did somebody tried the LL1690 with the Buffalo II?

3. any comparison with the Gigaworks dac?

Best Wishes
Pietro
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Old 15th October 2010, 12:41 PM   #128
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Hi Pietro

1. Correct you can connect the input straight to the DAC. However I understand that the Wolfson chip on the receiver module considerably reduces jitter so may well sound better. This is something I'm about to try myself.

2. They should work no problem if I got my A-20's to work with it. The Lundahls should sound good.

3. I also have the Giga DAC and as good as it is, it's nowhere in the same league as the Buffalo. The Buffalo really is a superb sounding DAC. If your'e thinking of getting one... do it.

Hope that helps
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Old 15th October 2010, 02:15 PM   #129
WDYSUN is offline WDYSUN  Italy
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Quote:
Originally Posted by RichLund View Post
Hi Pietro

I also have the Giga DAC and as good as it is, it's nowhere in the same league as the Buffalo. The Buffalo really is a superb sounding DAC. If your'e thinking of getting one... do it.
Hope that helps
is the difference between the two dacs that drammatic? And if yes, what are the relevant parameters based on which you judge the BUffalo to be superior?

Best
Pietro
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Old 19th October 2010, 09:29 AM   #130
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Originally Posted by RichLund View Post
1. Correct you can connect the input straight to the DAC. However I understand that the Wolfson chip on the receiver module considerably reduces jitter so may well sound better. This is something I'm about to try myself.
I've done this, definitely worthwhile if you have a source with significant jitter.
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