AD1865 the best DAC

[quanghao]

IV image

[regal]

Why do people keep using SRPP tube outputs on DAC's
? They are push-pull and get very unbalanced with the load (input impedance of the amp.)


I've comapred several tube outputs for DAC's and nothing sounds better with the right tube in a simple grounded cathode. Its SET and with the right tube can power any amp with a reasonable input impedance (40kohm or higher.)


The other issue with the AD1865 is the low output current you are going to use a high resistance I/V resistor which is not good. Best to parallel 4 AD865's to get a higher current and less load on the DAC Chip.

[audiodesign]

The SRPP / Topen pole in some case can lost sweetness because it is a little bit aggressive.
In any case I have ear some SRPP with a very good sound better than other gnd ground.
The sound of SRPP depend by the tube quality and in the gnd ground depend also by the quality of anodic resistor.
The best is a gnd ground with output transformer but in this case the cost of the project will be 10x.
I suggest to use only Jan Philips or Mullard tubes as low level.

[audiodesign]

To drive correctly a final stage with 10Kohm it is necessary have and output impedance near to 1Kohm and it not easy to do this with a gnd ground stage.
In any case I consider 1Kohm as the max output impedance on any audio component.

[audiodesign]

Sure if we parallel more AD1865 we can get more output current so many output volatge but we need in any case an voltage amplifier because never we will have the standard 2Vrms.

I have make some experiment with lower output I/V resistor value but the sound lost details so I have choisen the best.

[feket663]

Originally Posted by audiodesign

The SRPP / Topen pole in some case can lost sweetness because it is a little bit aggressive.
In any case I have ear some SRPP with a very good sound better than other gnd ground.
The sound of SRPP depend by the tube quality and in the gnd ground depend also by the quality of anodic resistor.
The best is a gnd ground with output transformer but in this case the cost of the project will be 10x.
I suggest to use only Jan Philips or Mullard tubes as low level.

And what do you think of the russian tubes ( like 6N2P (6Н2П)) on Lampizator's website?

[quanghao]

[QUOTE=feket663;2010746]And what do you think of the russian tubes ( like 6N2P (6Н2П))

! 6h6 and 6h2 and 6h30, 6c45pi The russian tube is good.
SRPP so 6h6, 6h30 is sound better than 6n2!

[quanghao]

my friend finis this board, you can see! thank

[feket663]

[QUOTE=quanghao;2011563]

Originally Posted by feket663

And what do you think of the russian tubes ( like 6N2P (6Н2П))

! 6h6 and 6h2 and 6h30, 6c45pi The russian tube is good.
SRPP so 6h6, 6h30 is sound better than 6n2!

THX the useful info!

[quanghao]

[QUOTE=feket663;2011604]

Originally Posted by quanghao

THX the useful info!

Ok! can you see in my pre! you can use tube 6h6 or 6h30. You can use one tube per chanel, or two tube per chanel!
Thank