Pure Tube i/V for ES9038PRO-9028, 9018, AKM...

[quanghao]

Quanghao,

I just got the Boards, thank you. Are you going to publish the correct schematic for the Tube Output? the one with the 4 tubes? instead of the 3 tubes? Also, the schematic for the power supply. The one that is posted has no link to the schematic. Can you please check, so we can start building this Tube Output?

Alex Deveza

Yes. All parlist i was up.
Thanks

 

[quanghao]

the schematic of IV tube

Hi friends!

Here is the schematic of IV tube.

thank you!

Quanghao

 

[adeveza]

Thanks Quanghao. Also the power supply and parts list, we need.

Thanks,
Alex Deveza

 

[quanghao]

The Circuit Supply and bom

HI all!

The Circuit Supply and bom

thanks

 

[quanghao]

Hi vega65!

this information about the PCB IV for ES9038 Dac

1. Pure tube I/V- Balanced Output
Pure tube I/V PCB
Best design from our 15 design IV.
You can use for:
ES9038 DAC
ES9028...
AKM4497.....
♥ PCB dimension: 19.5 x 19cm
♥ PCB thickness: 1.6mm, double layer,
Tube need use :
♥ Input: 2 x 12AU7
♥ Output: 2 x 6DJ8 or E88CC
♥ Cap Output: 4 x 1µF

2. HQ-Hv Supply for Tube IV
Output:
1. Positive voltage:
♥ 100-270VDC.
2. Negative voltage:
♥ 100-270VDC.
♥ Low noise , Low Z-out
♥ Use mosfet
♥ PCB dimension: 19.5 x 13cm
♥ PCB thickness: 1.6mm, double layer,

And all Schema , please see image, Thanks
Quanghao

 

[quanghao]

Quang Hao has a special promotion for members with Hq9038 Tube DAC.

A- The program contents are as follows:
1. Form of promotion:
30% discount and free shipping for
2. Products: Hq9038 Tube Dac
3. Program: diyaudio members
4. Promotion period: From 16/1/2018 to 16/2/2018

HQ9038 Tube Dac.


Register now!

 

[JPDuarte]

Please Can somebody tell me what is the difference between board with the 4 tubes and 3 tubes, the latter been old version perhaps? This is so confusing , after waiting for a year for this boards maybe I'm getting the old version ? this is not fair.

 

[chi0001]

Pure Tube I/V balanced x 1
HQ-Hv Supply for Tube IV x 1
ship to hongkong $25?

 

[alvin789]

Just saw the promotion message, can it be extended?

 

[quanghao]

Pure Tube I/V balanced x 1
HQ-Hv Supply for Tube IV x 1
ship to hongkong $25?

YES! thanks

quanghao

 

[quanghao]

Just saw the promotion message, can it be extended?

HI!

check mail please!

thanks

 

[chi0001]

Pure Tube I/V balanced x 1
HQ-Hv Supply for Tube IV x 1
ship to hongkong $25?

paid by paypal, please check.

 

[adeveza]

Please Can somebody tell me what is the difference between board with the 4 tubes and 3 tubes, the latter been old version perhaps? This is so confusing , after waiting for a year for this boards maybe I'm getting the old version ? this is not fair.

You can check the schematic to find out the difference. I have both of these pc boards. The 4 tubes can do balanced or single ended output and can use 6DJ8 or 12AU7 tubes on the second stage. The 3 tubes only has single ended output and all three tubes uses 12AU7. I have not tried it yet, but I am thinking of building the 3 tubes also as I dont need a balance output.

Alex

 

[quanghao]

You can check the schematic to find out the difference. I have both of these pc boards. The 4 tubes can do balanced or single ended output and can use 6DJ8 or 12AU7 tubes on the second stage. The 3 tubes only has single ended output and all three tubes uses 12AU7. I have not tried it yet, but I am thinking of building the 3 tubes also as I dont need a balance output.

Alex

thank adeveza show for all!

quanghao

 

[quanghao]

Hi JPDuarte and all!


yes, i have 2 option PCB

1. Pure i/V balance with: 2 tube 12AU7+ 2 tube 6DJ8

2. Pure I/V SE with 3 tube 12AU7

3. HV supply for Pure i/V use one

Now you can see schema off Pure i/V SE and par list! thanks

quanghao


PM: and some information about it with: Algar_emi post #217 DAC ES9038 PRO GR 2

 

[JPDuarte]

Thanks, is there any difference in sound between the two ?

 

[quanghao]

Thanks, is there any difference in sound between the two ?

It's almost the same, different output tubes 12AU7 and 6DJ8.

I sent you both 2 PCB options!

Thank you!

 

[adeveza]

R*1 & R*2

Quanghao,

I asked you this before, but I did not get a response, please explain, what is the meaning of the * in R*1 and R*2 on the main schematic.

Can anybody tell me what this means? I do not want to build this unit until I totally understand what everything means.

Alex

 

[quanghao]

Quanghao,

I asked you this before, but I did not get a response, please explain, what is the meaning of the * in R*1 and R*2 on the main schematic.

Can anybody tell me what this means? I do not want to build this unit until I totally understand what everything means.

Alex

it is all normal.

R*2 = R1 and R19=R*4 it is R for balance input Tube.

R*1 = R*3 , R set current for output!

all is symbol

ok, you see now???

please see image

thanks

 

[adeveza]

it is all normal.

R*2 = R1 and R19=R*4 it is R for balance input Tube.

R*1 = R*3 , R set current for output!

all is symbol

ok, you see now???

Sorry quanghao, but where is R*3, R19 and R*4? Its not in the schematic?

Alex