DAC ES9038 PRO GR 2

[quanghao]

Hello QH sent 92.00 dollars today to complete order for option 5. Waiting for confirmation. Thanks.

I got it, thank you very much!


oh, no , im sorry about option 5 now, the chassis you can need time for it? ok for you ? because now i set you all

and USB Amanero , you can by from amanero, because many time i can not have it!

thank your advice!
quanghao

 

[quanghao]

Andrea and I are working together on design and measurement of IV designs.

We work hard and work hard. We will have the earliest information on test measurements, designs, circuit diagrams, and specific values.

Please Wait!
Thank you so much, and we always want you to give up your results for time delays.


Please sse EX off my work!

 

[quanghao]

Hello friends!

I have tested about 15 i / V designs for ES9038PRO.

Andrea and I have also worked together, designing, testing on each design.

We tested and tested, now on my computer and my device and Andrea. Below, I will present the tested designs and test measurements.

I would like to thank:

1. keantoken - have run the simulation and have the best advice for I / V design

2. Morten checked the comparison of the ES9018-9038 data and checked the digital meter.

3. Thanks Andrea for the same design I DAC and the i / v with the test gauge.

Finally thank you all for trusting and looking forward to us.

Respect!

Quanghao

Andrea Ciuffoli and Quanghao

Design I/V DAC ES9038PRO
1) Passive LL1684 (original schematic)
measurement ok, sound ok

2) Strange differential stage
measurement ok,
sound ok but this is not a true differential stage

3) Differentianl stage + IRF820 (my output stage)
measurement for me ok , sound check more

4) Differentianl stage + cathode follower (my output stage with all tubes)
measurement ok sound is so so.

5) Pure tube stage push-pull with LL1660PP
measurement not ok for low freq. but use LL1660/18mA with only
measurement not ok, sound is bad

6) 6DJ8/ECC88+ transformer with capacitor in the middle
(Chapter 4)

measurement ok, sound need test more

7) SEPP with ll1684 trasf. input

measurement ok sound is best
....

 

[quanghao]

MEASUREMENTS

5) Pure tube stage push-pull with LL1660PP
measurement not ok, sound is bad!
thanks

 

[quanghao]

Differentianl stage + IRF820

Differentianl stage + IRF820

thanks

 

[quanghao]

LL1684_diff_perfect

LL1684_diff_perfect

 

[quanghao]

LL1684 Passive IV

LL1684 Passive IV

http://www.audiodesignguide.com/HiResolution/Suppler-V-I-LL1684-for-DAC.jpg

 

[quanghao]

T-Supper IV

T-Supper IV

 

[quanghao]

Strange I/V

Strange I/V

only 3 tube- SE output
thanks

 

[JPDuarte]

Thanks QH, I got my chassis yesterday, a very nice case by the way.Now just waiting for the parts.

 

[dariedel2]

Passive IV pcb changes

Quang Hào,

I got my order. The passive IVs you sent appear to be a new design. They have a relay and a diode on them. What are the values of these parts?
Thanks,
Doug
Dariedel2

 

[quanghao]

Quang Hào,

I got my order. The passive IVs you sent appear to be a new design. They have a relay and a diode on them. What are the values of these parts?
Thanks,
Doug
Dariedel2

hi!

the relay can not work in the PCB, you only use jum for output SE and balance!

thanks

 

[quanghao]

Pure Tube IV DAC ES9038PRO

And Now
Pure Tube IV DAC ES9038PRO
thanks

 

[szczemirek]

bump

 

[quanghao]

bump

he he! what you need bumP??

some day i have pcb for test all

he he, thank

 

[JPDuarte]

I'm still waiting for my boards, what is the status of the pure tube output and power supply?

 

[quanghao]

Hi all!

yes, PCB for pure I/V for ES9038PRO now i have test, all well
thank

 

[JPDuarte]

Hi QH, are you going to start shipping the boards.

 

[quanghao]

DAC ES9038PRO complete

Yes, this is a complete DAC ES9038PRO image, with a new face, full aluminum DAC cover.

Invite you to admire the beauty and sound of it promises many interesting things!

Thanks for your waiting!

 

[quanghao]

Yes, this is a complete DAC ES9038PRO image, with a new face, full aluminum DAC cover.

Invite you to admire the beauty and sound of it promises many interesting things!

Thanks for your waiting!
Quanghao