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Old 29th April 2010, 04:52 AM   #1521
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To use the DAC-END with tube, I connected the jumper on 1 and 2. Is it correct ? The tubes should invert. So the signal goes from pin 26 of the CS8414 to pin 10 of the AD1865.

In this case what is the 74HC04 doing ?

Thanks,

Davide
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Old 29th April 2010, 09:15 AM   #1522
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[QUOTE=Nikon1975;2169620]To use the DAC-END with tube, I connected the jumper on 1 and 2. Is it correct ?

no correct!

What is the sound ???
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Old 29th April 2010, 12:37 PM   #1523
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So I have to connect 2 and 3 ?

D.
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Old 29th April 2010, 01:01 PM   #1524
Yunick is offline Yunick  Sweden
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Quote:
Originally Posted by Nikon1975 View Post
I got the mine playing tonight ! Very impressed by the sound.

I have around 5.3 V on the input of the DAC. Is that enought ? I cannot raise it more.

Good project !! I like all these little modules to play around.

Davide

Hi, Good work!

Please post some pictures

Regarding 5.3V..
What is your resistor value for R13 on salas shunt?
Also measure gate - source on the last mosfet. It should read around 4V. If not you need to lower the R13 resistor value.

Best Regards
David

Last edited by Yunick; 29th April 2010 at 01:04 PM.
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Old 29th April 2010, 01:03 PM   #1525
Yunick is offline Yunick  Sweden
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Quote:
Originally Posted by ksnider1 View Post
I got my working just now, very nice sound. I still have to replace few components with audio grade. I will try mods sometime next week.
Very nice!

I see you have Wima on the output of I/V. how do you like them?

I tried RIFA PHE426 1µf and liked it very much.

You have some good time ahead trying different mods

Best Regards
David
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Old 29th April 2010, 01:04 PM   #1526
Yunick is offline Yunick  Sweden
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Quote:
Originally Posted by Nikon1975 View Post
So I have to connect 2 and 3 ?

D.
Yes!
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Old 29th April 2010, 01:14 PM   #1527
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This is a picture of the working prototype.

I used one transformer with two secondaries for +-5V one for +5V.

The black small one is a 5H choke and the black big one is the power transformer for HV. this is temporary.

Still did not understand the right position for the jumper, and how many regulators and filament supply I should use.

BR,

Davide
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Old 29th April 2010, 01:18 PM   #1528
Yunick is offline Yunick  Sweden
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Quote:
Originally Posted by Nikon1975 View Post
This is a picture of the working prototype.

Still did not understand the right position for the jumper, and how many regulators and filament supply I should use.
HI,

Thanks for the picture

If you want the signal to be in phase you need to connect a jumper between 2 and 3. If not. Use 1 and 2.

Your prototype seems to be complete to me.

Nice work with the shunt reg for the tube stage!

Best Regards
David
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Old 29th April 2010, 01:39 PM   #1529
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You mean the phase out of the DAC-END circuit or out of the Tube stage ?

The tube stage itself inverts.

D.
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Old 29th April 2010, 02:04 PM   #1530
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So I have R13=10 ohm
VgsQ16=3.3 V

R7=33 ohm
VgsQ10=3.6 V

R1=33 ohm
Vgs=3.8 V

I have available resistors of 27 ohm, 22 ohm , 8.2 ohm and 6.8 ohm. Do you think I should replace them ?

Are the heatsink really needed ? It's not that hot.

D.
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