HQ-IV tube output balance DAC

[Audioheaven]

How do I sign up for both the digi board and i/v??? 🙂

 

[quanghao]

How do I sign up for both the digi board and i/v??? 🙂

Hi!

now i have only the PCB iV tube stagle

The kit dac 32 ES9018 about 4 week i have it!

thanks

 

[adeveza]

Hi!

The kit dac 32 ES9018 about 4 week i have it!

thanks

Quanghao, is this the DAC Board? with amanero?

 

[quanghao]

Quanghao, is this the DAC Board? with amanero?

Yes i remember you need one kit dac + usb

please me for the product it!

thanks

 

[passive420]

Quanghau can you give a better part number for the U2 on I/V.

AK5W-K does not bring anything up.

 

[quanghao]

Quanghau can you give a better part number for the U2 on I/V.

AK5W-K does not bring anything up.

this: A-5W-K Fujitsu | Mouser


817-A-5W-K ( you need choise 12 V for Heate 12V )

This 12V: TAKAMISAWA BL Original Single Relay A12W-K 10pin 12V

A-12W-K Fujitsu | Mouser


thanks

 

[passive420]

OK Thanks.

I also found this one:

EA2-12NJ KEMET NEC-Tokin | Mouser

 

[adeveza]

Yes i remember you need one kit dac + usb

please me for the product it!

thanks

If I understand you correctly, and you will be selling them, please reserve me with one kit + usb.

 

[adeveza]

Quanghao, where did you get the RCA output connector that fits the PCB?

 

[adeveza]

Hi Blitz!

Thank you for showing me,

Yes, I was confused schematic, very sorry for you!

And this is my circuit diagram!

Quanhao, I am studying the schematic and the pcb, you have two different schematic, can you please post again which one is the correct one? I am a bit confuse. The one you said was yours, it does not have C3, R11 (left), but the pcb has it?? Please clarify

 

[passive420]

Quanghao, where did you get the RCA output connector that fits the PCB?

These look like they might fit, not sure of the brand.

Low cost high quality Right angled gold plated RCA sockets | Hifi Collective

and

http://www.ebay.co.uk/itm/Gold-Plated-Horizontal-PCB-Phone-Socket-/261929385857

look for professional gold plated PCB RCA connectors.

 

[adeveza]

These look like they might fit, not sure of the brand.

Low cost high quality Right angled gold plated RCA sockets | Hifi Collective

and

Gold Plated Horizontal PCB Phone Socket | eBay

look for professional gold plated PCB RCA connectors.

Looks like thats the one, thanks..

 

[passive420]

Quanghau, can you tell me what C3/R11 and C6/R26 do in the circuit? I cannot see them in the schematic posted. Just wanted to choose the right components for the job.

It looks like they decouple the diff amplifier stage from the output stage?

Adeveza -I already asked this. Also why the 4 pin connector and the stray trace that stops dead. Seems a waste of copper.

 

[passive420]

Quanghau - For ECC99 tubes R5, R14, R20, R29 = 470R? Same as 6DJ8?

Is it possible to use other tubes for V2/V4 ex: 12AX7, 12BH7 if we calculate R8, R9, R23, R24 and R1, R2, R16, R17?

Or change R8, R9, R23, R24 and adjust VR's?

 

[quanghao]

Quanghau - For ECC99 tubes R5, R14, R20, R29 = 470R? Same as 6DJ8?

Is it possible to use other tubes for V2/V4 ex: 12AX7, 12BH7 if we calculate R8, R9, R23, R24 and R1, R2, R16, R17?

Or change R8, R9, R23, R24 and adjust VR's?

yes, 6DJ8 can change by Ecc99.

12AX7, 12BH7 , i not test this tube, but 12BH7 you can usre
R5, R14, R20, R29 = 470 - 1K, set curent = 10-15mA at 260V +b

and all shema for two options output. An HV supply
thanks

 

[quanghao]

hi my friend, please see this: #175

thanks

quanghao

 

[adeveza]

Diodes and a Cap??

hi my friend, please see this: #175

thanks

quanghao

Quanghao, the PS pcb has diodes and a cap labeled, D5, D6, D7, D10 and C4, but they are not on the schematic. Can you please clarify where they are in the schematic? Please

 

[quanghao]

Quanghao, the PS pcb has diodes and a cap labeled, D5, D6, D7, D10 and C4, but they are not on the schematic. Can you please clarify where they are in the schematic? Please

See all shema post 175.
Thanks

 

[passive420]

Quanghau - I would like to use Shinkoh resistor for R6,R12 & R21,R27 low pass filter but no 2k2. Can I use 2K4 with 470pf for filter?

Can we reduce value of 2k2 and increase 470pf for same frequency filter?

Is this correct?
Cut off Frequency: 2K2 & 470pf = 153999.67968067 Hz.

We can also use 1k3 & 800pf for same frequency cut off?

Low Pass Filter Calculator

 

[quanghao]

Quanghau - I would like to use Shinkoh resistor for R6,R12 & R21,R27 low pass filter but no 2k2. Can I use 2K4 with 470pf for filter?

Can we reduce value of 2k2 and increase 470pf for same frequency filter?

Is this correct?
Cut off Frequency: 2K2 & 470pf = 153999.67968067 Hz.

We can also use 1k3 & 800pf for same frequency cut off?

Low Pass Filter Calculator

yes, you can get the value you like!
thanks