Hi Nuuk
Interesting, too me 10k seems very high for a preamp with has a very fast smps behind it.
I will try it out in the next few days, the missus is away on bussiness in Spain so that give me some time to play!!
I may well just try different caps between them to see how it effects the sound.
Sounds like an interesting little project for my limited skills in this area.
How is t. using multiple SMPS? i dont understand unless he is using one per channel.
Phil
Interesting, too me 10k seems very high for a preamp with has a very fast smps behind it.
I will try it out in the next few days, the missus is away on bussiness in Spain so that give me some time to play!!
I may well just try different caps between them to see how it effects the sound.
Sounds like an interesting little project for my limited skills in this area.
How is t. using multiple SMPS? i dont understand unless he is using one per channel.
Phil
Re: Amen to bass!
Ryan, Ryan, Ryan. more work!!!!! Thanks so very much.
this got me thinking. seeing that i have a SIL chip now i can move the preamp part to the same level as the power supply. this in itself is already better. then the daughter board will be a dc servo or the first stage of the diagram as mentioned above. with some carefull planning this shouldn't be to difficult.
Dr.H said:
Ryan, Ryan, Ryan. more work!!!!! Thanks so very much.
this got me thinking. seeing that i have a SIL chip now i can move the preamp part to the same level as the power supply. this in itself is already better. then the daughter board will be a dc servo or the first stage of the diagram as mentioned above. with some carefull planning this shouldn't be to difficult.
Fill he may be using one per channel or he may be doing it like this.
An externally hosted image should be here but it was not working when we last tested it.
Re: Amen to bass!
Ryan, I know that paper for long, it is easy to implement and you'll have very low dc offset.
But I wanted to try the AD815 alone, the only way to see what it's capable of, no other active components.
That solution is the easy way, but didn't (and doesn't) appeal me. The input opamp will always have an impact on the performance, whatever you choose.
About bass: everything gets better when the bass is right.
Untight, slow bass veils the midband and treble.
It is not just a question of getting some body massage, it's the whole musical presentation.
Amen to bass!
Some more recommendations:
Stanley Clarke - "At the movies"
Marcus Miller - "M2"
Dr.H said:
Ryan, I know that paper for long, it is easy to implement and you'll have very low dc offset.
But I wanted to try the AD815 alone, the only way to see what it's capable of, no other active components.
That solution is the easy way, but didn't (and doesn't) appeal me. The input opamp will always have an impact on the performance, whatever you choose.
About bass: everything gets better when the bass is right.
Untight, slow bass veils the midband and treble.
It is not just a question of getting some body massage, it's the whole musical presentation.
Amen to bass!
Some more recommendations:
Stanley Clarke - "At the movies"
Marcus Miller - "M2"
carlosfm said:
No need to sorry, that thing is snubberized.
😀
SUBBERIZED IT WILL BE......
t. said:
t., thanks for the kind words. I have been to hell and back again building the LM4780 amp and enclosure.
rudi said:safetyman, i wish i can see you face when you listen to these for the first time.
😀
rudi said:YES GET SOME SLEEP.....................
Rudi, I'll get the camera to roll just b4 we audition the combo, and send you the clip and you can see our faces. 😀 Thanks. I worked on the GC till six in the morning and after 3 hours of sleep, off to work again.
I Love the Rebecca Pidgeon's Album too. You should listen to the 'Grandmother' track.
Tight bass is a great experience. No doubts about that.
Tight bass is a great experience. No doubts about that.
Nuuk said:
Thats how I did it🙂 I wanted the highest current so I used a pair of SMPS seeing as though the -12v on each is much lower than the +12v 😉
I tried 3 different 10k caps and few lower ones
The 10k caps did sound slightly heavy but Carlos snubber seemed to really sort this out which went across the supply pins to ground as well as the 100nf smd ceramic stacked film
Out of the three different 10k caps I tried (Nichicon,Rubycon,Sikoral) the Siemans Sikoral easily sounded the best, the Nichicon was crap!
The resulting sound in my system is very good, , its more different than worse compared to the super regs and probably is down to personal taste, the Super regs have greater dynamics though, it would be nice to be able to squeeze more voltage out of them but 12v from both the battery and SMPS seemed ok.
They are something worth experimenting with, I thought these units already worked really well with the GC and T-amps.
Also lightly twisting the output wires made a noticeable difference.
I can't think of any other supply to try now, luckily Rudi's board made trying out the different supplys really easy
A thing to note I tried all these supplys with the Servo version, I've not had time to get Carlos nulling circuit up and running to compare yet
Hi Leo, Your mail is not in yet. That's okay. Enjoy yourself and please keep us posted on your progress.
Gotta go catch some sleep now. Only managed 3 hours last night, having nightmares of my LM4780. 😀
Have fun, mate.
Cheers.
Gotta go catch some sleep now. Only managed 3 hours last night, having nightmares of my LM4780. 😀
Have fun, mate.
Cheers.
t. said:
It is always very improtant to do that, to minimize RF pickup.
Not necessarily lightly twisted, I usually twist tightly. Depends on the stiffness of the wires.
For small currents (like preams) shielded cable also works very well, three or four internal wires + shield.
The shield is connected only on the PSU side.
safetyman said:
Our internet is NTL so you may get it late next month😀
3 hours, you must be knackered! go and have pleasant dreams mate about the finished amp and pre, you'll soon be getting SWEEEET music😉
carlosfm said:
Thanks for the tip Carlos, I have a bit of 3 core shielded equpment wire somewhere in my boxes of junk🙂
I'm still amazed how good this pre amp sounds with the AvondaleNCC200
safetyman. something i find weird is that it takes upto half a day to get your mails sometimes even longer. maybe you have the same problem that side with mail comming from my end
Hi T.
regarding the nulling circuits. with the new design one does not swap out preamps anymore but the nulling circuits. so we will be able to test that soon. i have also made provision to replace the nulling circuit board with the first stage of the walt jung design. ( all you have to do then is replace 4 resistors and you have the alternative design)
now to figure out something for the smd circuits but that might come down to choosing either a walt jung design or the DC servo.
regarding the nulling circuits. with the new design one does not swap out preamps anymore but the nulling circuits. so we will be able to test that soon. i have also made provision to replace the nulling circuit board with the first stage of the walt jung design. ( all you have to do then is replace 4 resistors and you have the alternative design)
now to figure out something for the smd circuits but that might come down to choosing either a walt jung design or the DC servo.
t. said:I'm still amazed how good this pre amp sounds with the AvondaleNCC200
IME it will always amaze you. 😀
rudi said:
Thats an excellent idea Rudi😎 having these as an option would be handy, I'm afraid your nice board currently looks a bit swamped with the different psu's attached, its good to be able to try these things out though🙂
carlosfm said:
Yes, I'd say this one is my favorite pre so far
The next thing I'd like to do is remove the input stage from my UCD180 and drive it direct with this pre seeing as though the AD815 is a much better sound than the AD8620 on the UCD's input, I think the UCD's imput stage has a x4 gain, I'll need to check
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