• Disclaimer: This Vendor's Forum is a paid-for commercial area. Unlike the rest of diyAudio, the Vendor has complete control of what may or may not be posted in this forum. If you wish to discuss technical matters outside the bounds of what is permitted by the Vendor, please use the non-commercial areas of diyAudio to do so.

DAC-END The best DAC AD1865- UPDAT 2011

Hi Quanghao, I have a problem with the power stage circuit in the 260V SSHV specifically, since there is only the 61V output.
I have attached some pictures where you can see the component values ​​that have been used and the voltages obtained.
Thanks.

please change new IRF 9610 and 3 led.

measure the V on R1 = 1.8 to 2.1v, it is good!

thanks
 
Hi Quanghao,
I changed the IRF9610 and the 3 LEDs with a new one.
I measured the voltage on R1 33ohm = 18V.

I have two PCB mounted and the problem is the same in both.
Only 82 V at the output.

What is the correct value to R12 and R4? in Scheme R12 = 270K (1W) R4 = 120K (2W). R12 on the PCB is R8 = 220K (1W) R4 = 180K (2W).
R3 56K in Scheme (5W) PCB (R3 = 180K, R3B = 180K, R3C = 180) Total = 60K.
For 56K (R3 = 180K, R3B = 180K, R3C = 150K) Total = 56K250.

Have you tried the new PCB? I do not understand where the problem is.
Thanks.
 
Last edited:
hello Guanghao,

the sound is very nice and fairly compensated, thanks to Andrea, and to you for the work you have done.

Just one more question I have installed the 5687 and point B I have 144V. and point P 51V. is that correct?.

without putting the Tubes I have in the point B 260V.
thanks
 
Last edited:
hello Guanghao,

the sound is very nice and fairly compensated, thanks to Andrea, and to you for the work you have done.

Just one more question I have installed the 5687 and point B I have 144V. and point P 51V. is that correct?.

without putting the Tubes I have in the point B 260V.
thanks

no!

if not use LL1660 out put,
So the V at +B 250 to 260V, The vol at Anode at 90 to 100V. thanks
 
Just finished, to be tested
 

Attachments

  • dac.jpg
    dac.jpg
    186.5 KB · Views: 859
  • IV.jpg
    IV.jpg
    196.9 KB · Views: 834
hi Quanghao, I have not found schematic for your stage iv board, this is one dated 15/9/2011 and has lots of diodes on it which are not speficied. as well as 4 jumper wires.

Can you kindly post a scheuatic for this sshu LL1660 iv stage board. thanks, John

you use 2 jum follow:

jum 6H if you use tube 6Dj8, 6h30
Jum 5687 for 5687 and el82cc, or bandix 6900

thank