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DAC-END The best DAC AD1865- UPDAT 2011

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#162
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.
 
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#163
hello Quanghao,

I think I found the problem resistor R1 = 33 Ohm, in the two PCBs were cut could not imagine that 2 of 33 ohm resistors Dale new were defective.

On Monday I will see if it works well now I have 33 Ohm resistors. Sorry I bothered by this problem.
Thank you.
 
#168
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
 
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#169
hordmop said:
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
Click to expand...

no!

if not use LL1660 out put,
So the V at +B 250 to 260V, The vol at Anode at 90 to 100V. thanks
 
#174
Just finished, to be tested
 

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#175
JohnGeneva said:
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
Click to expand...

you use 2 jum follow:

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

thank
 
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