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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 18th January 2013, 09:42 PM   #181
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it is so so, not good!
thanks
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Old 19th January 2013, 06:11 AM   #182
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I've learned a lot from this DAC!
Thank you very much, people were cheering for me complete this DAC 32!
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File Type: jpg dCS-3.jpg (662.5 KB, 542 views)
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Old 17th February 2013, 12:20 PM   #183
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Hi, Quanghao!
Did you try 6H30 valve in this board?
Yesterday I tried to change 5687 to 6H30, so, I revired all jumpers and filaments to get 6.3v, P - 90v.
This resulted in noise and tube ringing during turn on.
Could you suggest what to do?
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Old 2nd March 2013, 05:10 AM   #184
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Quote:
Originally Posted by danielkol View Post
Hi, Quanghao!
Did you try 6H30 valve in this board?
Yesterday I tried to change 5687 to 6H30, so, I revired all jumpers and filaments to get 6.3v, P - 90v.
This resulted in noise and tube ringing during turn on.
Could you suggest what to do?

please check all Jum and the transformer for it,


filaments 6h30 need min 2A for 6.3V

60h30 will sound more balanced, and more preferably 5687.
thanks
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Old 2nd March 2013, 05:19 AM   #185
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And what should be the values for R1 and R11?
I have 240v 90 mA AC input and P voltage is only 83v.
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Old 6th March 2013, 08:23 PM   #186
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Quote:
Originally Posted by danielkol View Post
And what should be the values for R1 and R11?
I have 240v 90 mA AC input and P voltage is only 83v.
100R for R 11
and 27 to 33R for R 1

thanks
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Old 11th March 2013, 07:36 AM   #187
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Hi Hao!
I still have a couple of questions concerning LL1660 board:
1. I should use LL1660 10 ma version?
2. For 6h tube - which one (6H30 or 6H6)?
3. R1 and R11 values for power supply?
Thanks!
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Old 13th March 2013, 08:18 AM   #188
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Hi, Hao!
It seems that you have reworked the SSHV supply on the latest LL1660 board, as it has 2 MJE350 instead of 1 before.
Maybe you can give a circuit scheme?
Thanks!
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Old 14th March 2013, 10:09 PM   #189
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[QUOTE=danielkol;3405359]Hi Hao!
I still have a couple of questions concerning LL1660 board:
1. I should use LL1660 10 ma version?

I make parallel ( 10mA * 2)

2. For 6h tube - which one (6H30 or 6H6)?
for 5687 or E182cc, or can use 6h30 better than 6h6

3. R1 and R11 values for power supply?
R1 = 33R

R 11 = 100K to 330 /2W

Thanks!
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Old 20th March 2013, 02:37 PM   #190
la1209 is offline la1209  Hong Kong
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Hi Quanghao,

Please check PM, thanks!

Kenneth
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