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Old 25th February 2010, 10:40 PM   #881
adamus is offline adamus  United Kingdom
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i wonder if i have something wrong in the dac section, or if one of the chips is bad. I can easily set the voltage without the dac stage, connect it and it drops one wont budge past 5.16.

I have a couple of high idss 170sk's so i can try that the 2sk170s were matched at 7ma idss. first i will pull the dac chips and see. As i said though, its sounds great and nothing is getting hot, so maybe you are right, its just coming up short.
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Old 25th February 2010, 11:56 PM   #882
Ryssen is online now Ryssen  Sweden
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quangho: Do you have 2 more Salas shunt pcbs to sell to me?
If you have Ill pay you imidiately by paylpal.

Ryssen
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Old 26th February 2010, 12:25 AM   #883
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Default LEDs

I may have my head on backwards but are L1 and L3, L6 and L8, L11 and L13 mislabeled on the Salas board. On the schematic I see R1 connecting to anode of L1 but on the board it connects to L3 etc.

I am assuming flat side of LED label on board is cathode.

Thanks

Bob
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Old 26th February 2010, 04:28 AM   #884
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Quote:
Originally Posted by adamus View Post
thanks salas. i may try it at some point.

quanghao or audio design, I cant adjust the 5v digital 5+ over 5.16v, even with increased current (27 ohms)

nothing is getting hot, and the tl431 is regulating to 5v and the dac sounds good.

do you experience the same or do i need to debug?
Hi! The Salas shunt low is exelent, and the PCb is not wrong, it is easy adjust V-out, now you can adjust to 5.6V.
After R 10 Ohm and Tl 431 lost about 0.3-0.5V.

You can check abut the 2 LED and Trimer
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Old 26th February 2010, 04:52 AM   #885
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Quote:
Originally Posted by adamus View Post
thanks salas. i may try it at some point.

quanghao or audio design, I cant adjust the 5v digital 5+ over 5.16v, even with increased current (27 ohms)

nothing is getting hot, and the tl431 is regulating to 5v and the dac sounds good.

do you experience the same or do i need to debug?
Hi! Admus. about the Salas shunt and the set curent for DAC you can see in the my image!
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Old 26th February 2010, 05:07 AM   #886
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A simple mod with this could be to ditch the 47k resistors and build a simple cascode CSS with led ref (keeping the bias scheme). That would flatten the load line and probably reduce distortion a little (although its only 0.2% anyway! we arent swinging much voltage anyway, so i really am being picky i think. It would increase the gain too, which probably isnt wanted.

About the IV 5687. Andrea has mesure many the value or R Anod, so we are like 47K paralle.

About the Cascode with 2 led gree you can try to it, but i dont like the sound when use led.

you can try remove C by bass, I think you like sound .
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Old 26th February 2010, 05:42 AM   #887
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Quote:
Originally Posted by adamus View Post
well... its been playing music all morning.

the dac-end clearly has potential. its very natural sounding, superb top end (maybe slightly rolled off? not sure but its definately sweet with no hint of
The dacend will satisfy my tweaking needs more. I already can see the potential for a 6n6p ouput stage, gyrator or CSS loaded, led biased. i do love the 6n6p.
I love 6h6pi and 6h30pi, i have been to design cricuit of use parallel 6h6 and 6h30 few year ago. I make many PCB for my friend, they was like them.
The sound is excellent, I love them. the and new pre818 I use 2 tube 6h30 or 6h6 parallel.

In this circuit, you can try do most for IV stage if you like it.
6h30 is better than 6h6.
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Old 26th February 2010, 05:47 AM   #888
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Quote:
Originally Posted by Ryssen View Post
quangho: Do you have 2 more Salas shunt pcbs to sell to me?
If you have Ill pay you imidiately by paylpal.

Ryssen
Yes the Salas shunt I still have some PCB!
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Old 26th February 2010, 09:47 AM   #889
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Quote:
Originally Posted by Salas View Post
Hey Quanghao, did you ever try the SSHV instead of the cap multiplier on the output stage? I smell potential.
Yes! I have been to make it, it is simple, and better!
i love it!
Thank Salas
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Old 26th February 2010, 11:29 AM   #890
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Quote:
Originally Posted by quanghao View Post
I love 6h6pi and 6h30pi, i have been to design cricuit of use parallel 6h6 and 6h30 few year ago. I make many PCB for my friend, they was like them.
The sound is excellent, I love them. the and new pre818 I use 2 tube 6h30 or 6h6 parallel.

In this circuit, you can try do most for IV stage if you like it.
6h30 is better than 6h6.
quanghao

Do you still have this I/V boards for the 6H6P ?
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