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Quanghao Audio Design Quanghao Audio Design is a producer of DIY Audiophile Kits and PCB boards, selected from many listening tests!

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Old 29th November 2012, 03:20 AM   #161
quanghao is offline quanghao  Viet Nam
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Quote:
Originally Posted by hordmop View Post
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
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Old 29th November 2012, 08:57 PM   #162
hordmop is offline hordmop  Spain
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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 by hordmop; 29th November 2012 at 09:01 PM.
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Old 1st December 2012, 02:13 PM   #163
hordmop is offline hordmop  Spain
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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.
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Old 1st December 2012, 09:04 PM   #164
quanghao is offline quanghao  Viet Nam
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Quote:
Originally Posted by hordmop View Post
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.
Hi how it work??
thank
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Old 2nd December 2012, 06:00 PM   #165
andrea_mori is offline andrea_mori  Italy
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Quanghao, guys,

my transport provides a balanced output, so I would like to use DAC END XLR input.
Did you test XLR input? Does balanced connection works?

Thanks all
Andrea
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Old 3rd December 2012, 09:14 AM   #166
andrea_mori is offline andrea_mori  Italy
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Default Balanced input

Anyone can help?

Andrea
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Old 4th December 2012, 09:32 PM   #167
quanghao is offline quanghao  Viet Nam
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Quote:
Originally Posted by andrea_mori View Post
Quanghao, guys,

my transport provides a balanced output, so I would like to use DAC END XLR input.
Did you test XLR input? Does balanced connection works?

Thanks all
Andrea
yes, but you not use toslink.
thanks
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Old 4th December 2012, 09:55 PM   #168
hordmop is offline hordmop  Spain
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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 by hordmop; 4th December 2012 at 10:02 PM.
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Old 4th December 2012, 10:11 PM   #169
quanghao is offline quanghao  Viet Nam
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Quote:
Originally Posted by hordmop View Post
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
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Old 4th December 2012, 11:16 PM   #170
andrea_mori is offline andrea_mori  Italy
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Quote:
Originally Posted by quanghao View Post
yes, but you not use toslink.
thanks
Hi,
do you mean don't use both at the same time?
or don't install TORX?
Andrea
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