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Old 14th March 2010, 08:38 PM   #1091
boudy is offline boudy  United States
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Default Y'all are polluting this thread...

The chip GB belongs in its own thread.
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Old 14th March 2010, 08:44 PM   #1092
Pocoyo is offline Pocoyo  Indonesia
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Default GB Update

AD 1865N-K Group Buy by HOUSING
1. Pocoyo 2 pcs
2. FredLock 1 pcs
3. Housing 1 pcs
4. jasujonas 1 pcs
5. jims 2 pcs
6.
7.
8.
9.
10.

Total GB : 7 pcs in view order (minimum order must 15)
Will buy from DIGIKEY not from CHINA
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Old 14th March 2010, 08:55 PM   #1093
Pocoyo is offline Pocoyo  Indonesia
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Im very sorry
For a new Group Buy of AD 1865 N-K moved here

Ad 1865 n-k

thank you

* Dont forget to support your AD 1865 N-K with another *
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Old 14th March 2010, 10:24 PM   #1094
torsken is offline torsken  Norway
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Quote:
Originally Posted by gabanyayaya View Post
My mistake...perhaps this is the right way to load the heater to adjust the voltage to 6.3V....3 resistors in series....please correct me if i'm wrong...

Click the image to open in full size.
Thank you very much for clarifying this. So what is the right way of testing the HV? If anyone can make a similar drawing I will be very thankful.
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Old 15th March 2010, 03:41 AM   #1095
mikelm is offline mikelm  England
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1. Pocoyo 2 pcs
2. FredLock 1 pcs
3. Housing 1 pcs
4. jasujonas 1 pcs
5. jims 2 pcs
6. mikelm 1 pcs
7.
8.
9.
10.
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Old 15th March 2010, 06:13 AM   #1096
housing is offline housing  Hong Kong
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O.K. guys. Move your intention to buy AD1865N-K from Digikey here :

Ad 1865 n-k

Further entry in this thread will be neglected. Sorry!

Thanks to Jeff for setting up the thread for the new international group buy.
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Old 15th March 2010, 06:35 AM   #1097
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After comparing three DACs with some people, they all choose my old DAC with AD1865 with different tube setup.

I think in this project the I/V tube stage can be improved.

The bottom line is: this DAC costed three times the old one, it's far more complicated and it does not reach the performance of my old one.

Good lesson.
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Last edited by apelizzo; 15th March 2010 at 06:39 AM.
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Old 15th March 2010, 10:09 AM   #1098
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Quote:
Originally Posted by apelizzo View Post
After comparing three DACs with some people, they all choose my old DAC with AD1865 with different tube setup.

I think in this project the I/V tube stage can be improved.

The bottom line is: this DAC costed three times the old one, it's far more complicated and it does not reach the performance of my old one.

Good lesson.
So where to now??

Are you gonna try and upgrade this dac or I/V tube stage to improve its performance?
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Old 15th March 2010, 10:45 AM   #1099
adamus is offline adamus  United Kingdom
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do the led bias mod, it makes a very good impact.

cathode bypass caps to my ears sound a little confused and muddy.

Replace the anode resistors with a CSS or gyrator (the later i have not tried). 7.5ma is a little too low on the 5687's, 12ma + is a good idea to be linear.

Last edited by adamus; 15th March 2010 at 10:51 AM.
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Old 15th March 2010, 10:54 AM   #1100
tassosk is offline tassosk  Greece
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Hi Adamus,
Since I too have DACMagic for reference, how does it compete DACEND2 after the modification in terms of resolution of details?
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