Hello
I need help to wire pcm1704 dac ,to a Lundahl 1674 trafo
Is there someone who have used that .and can show me the best way to wire ??
Will be very pleased for the best value for the I-V resistor.
The output will be 6n2p tube in srrp
best regards
Bjarne
I need help to wire pcm1704 dac ,to a Lundahl 1674 trafo
Is there someone who have used that .and can show me the best way to wire ??
Will be very pleased for the best value for the I-V resistor.
The output will be 6n2p tube in srrp
best regards
Bjarne
Why the transformer?
May I first ask the following question? What is your design objective in placing a transformer between the PCM1704 and the 6N2P stage?
May I first ask the following question? What is your design objective in placing a transformer between the PCM1704 and the 6N2P stage?
I am not sure i can get the 6n2p to give me about 3v out...the pcm1704 gives very little signal out...i then hope i can make the I-V resistor low...i think this is best for the pcm1704
best Bjarne
best Bjarne
For the I/V resistor we have found anything between 400 to 500ohms works fine. I use a 490ohms TI102 series resistor on each primary. We have gone as low as 150ohms but any lower than 400ohms seems to compress the music.
My configuration is 1:4 using just one primary and one secondary winding. If your preamp is very low gain, you can configure the transformer as a 1:8. To my ears and in my system 1:4 sounds the cleanest.
Shield is connected to the output RCA ground via a separate wire ie. not sharing signal ground. You can try paralleling the primaries and or secondaries and this has subtle effects on the sound. Do you have the datasheet for the Lundhal? If you do, it is easy to figure out the pin connections and phase relationships.
Cheers,
David
My configuration is 1:4 using just one primary and one secondary winding. If your preamp is very low gain, you can configure the transformer as a 1:8. To my ears and in my system 1:4 sounds the cleanest.
Shield is connected to the output RCA ground via a separate wire ie. not sharing signal ground. You can try paralleling the primaries and or secondaries and this has subtle effects on the sound. Do you have the datasheet for the Lundhal? If you do, it is easy to figure out the pin connections and phase relationships.
Cheers,
David
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Great advice
happy to see my trying is not all that bad.. i use 1:8 and 600ohm--i love the the sound of the pcm1704...but i am not sure i like the sound of the Lundahl trafo
Started another tread about my dac (newclassd)...there i will write about the sound
best Bjarne
happy to see my trying is not all that bad.. i use 1:8 and 600ohm--i love the the sound of the pcm1704...but i am not sure i like the sound of the Lundahl trafo
Started another tread about my dac (newclassd)...there i will write about the sound
best Bjarne
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