Nuuk said:
I don't know the VA rating of that trafo, it was scavenged from an old amp, I just said it's much smaller.
Nuuk said:
That "mini" Krell thing started as a joke, a way to explain a tight bass, a way to explain that this one drives my Epos speakers much better.🙂
Some people liked it, and adopted the name.😀
Anyway, this is now getting too far from being a GC...
Uhh... you're right Nuuk, it's not easy to browse this thread.
tbla said:
What pcbs?
I remember you saying something, but it was too many time/pages ago...🙂
Is is the bridge/parallel?
Or your 6-channel amp for tri-amping your ATCs?😉
I reduced the hum but not completely. Anyway, good enough for an extended listen.
I really don't want to become involved in any battles here but IN MY OWN EXPERIENCE I would say that if you cannot hear a clear improvement with the regulated power supply then you either have something wrong with your system or your ears! 😉
The amp is much more able to deal with the demands of 'difficult' bass and the midrange and top end are also much better. In my test system though it is the clarity of the bass lines which stands out most.
An interesting point is that once again, my heatsinks are running much warmer than my other GC's. This seems to happen for the first few days of operation and then they cool down.
The regulator heatsinks don't appear to get very warm - less than body temperatire after about one hour of listening at moderate volume level. This despite the fact that they are dropping nearly 10 volts!
Now I can play around with the buffer as regards choice of opamp and with or without class A applied. I will also try a smaller VA transformer but as that involves taking one out of my VBIGC supply, it may have to wait a while.
After that I intend to make a preamp and probably run the IGC's without a buffer (but with very short interconnects). I have heard this working to good effect in a friend's system.
Once again thanks to ALL those who have helped me get my regulated GC up and running. I won't mention names but you know who you are! 😉
I really don't want to become involved in any battles here but IN MY OWN EXPERIENCE I would say that if you cannot hear a clear improvement with the regulated power supply then you either have something wrong with your system or your ears! 😉
The amp is much more able to deal with the demands of 'difficult' bass and the midrange and top end are also much better. In my test system though it is the clarity of the bass lines which stands out most.
An interesting point is that once again, my heatsinks are running much warmer than my other GC's. This seems to happen for the first few days of operation and then they cool down.
The regulator heatsinks don't appear to get very warm - less than body temperatire after about one hour of listening at moderate volume level. This despite the fact that they are dropping nearly 10 volts!
Now I can play around with the buffer as regards choice of opamp and with or without class A applied. I will also try a smaller VA transformer but as that involves taking one out of my VBIGC supply, it may have to wait a while.
After that I intend to make a preamp and probably run the IGC's without a buffer (but with very short interconnects). I have heard this working to good effect in a friend's system.
Once again thanks to ALL those who have helped me get my regulated GC up and running. I won't mention names but you know who you are! 😉
Nuuk said:
Thanks for convincing me that I don't need to check my ears.😀
The humm... use this as a single PSU, you only have a set of diodes for both channels.
Nuuk said:
I noticed that too.😉
What happens is that you NOW have power, this is not a GC anymore, more like a Krell.
😀 Nuuk said:
Yes, do that.
And to test without the op-amp remove it from the socket (you used one, right?🙂 ) and put a little jumper there.
we have come full circles on this. First, little filter caps on the PS make superior sound and you have tons of self-proclaimed authorities explaining why that's the case and why the little chip that can has just defied the laws of physics.
Now, we have a regulated PS (which essentially amounts to an unregulated PS with an infinitely large filter cap, as far as the load is concerned) and the same self-proclaimed authorities aree xplaining, using the same theories, that this regulated PS is superior.
Guys, can you just make up your mind?
🙂
Now, we have a regulated PS (which essentially amounts to an unregulated PS with an infinitely large filter cap, as far as the load is concerned) and the same self-proclaimed authorities aree xplaining, using the same theories, that this regulated PS is superior.
Guys, can you just make up your mind?
🙂
these are the V. 1.0 pcb's, i ordered 12 pieces and got 15.....🙂
this pcb is for one lm3386 and one pair of the lt1083.
it's for one monoblock, and there is room for everything but the trafo.
we also made pcb's holding 4 x lm3886, but they don't have the regulators on - its actually 4 independant amps wich can be configured as you like.
these were used for the triamping thing.
but i wanted to have six "small" monoblocks, therefor we made the new pcb. i will use one cerafine 10.000uF/63V for each regulator and one silmic 470uF/50V after + 0,1 wima fkp3 at the lm3886 powerpin.
i use IR hfa08tb60 rectifiers, and 300VA black talema trafos - one for each monoblock.
Before we start 'round 14', let's make one thing clear:
That's all we can do!
We are all making up our own minds (or should be). Hence no need for altercation. 😉
millwood said:
I would like to see some empirical results myself. I think that there is a psycho-acoustic effect directly proportionate to the amount of perspiration put into the project.
Carlos,
I've been following this thread with great interest, as well as your thread regarding your high-end preamp circuit in the Solid State forum. I check the forums every day but, as everyone knows, there's so much going on in here that I don't remember precisely what your system consists of.
Now that you've buffered the GC, do you find any benefit to also using the preamp before the GC? Or does the buffer fulfill the role of the preamp?
I've been a longtime owner of the Gaincard and always preferred it with a good preamp. In my case, it's a Cary SLP-94. It would be great to build all of this good sound into a small and simple package.
Anyone tried a GC with an Ultrapath preamp, BTW?
Thanks,
KT
I've been following this thread with great interest, as well as your thread regarding your high-end preamp circuit in the Solid State forum. I check the forums every day but, as everyone knows, there's so much going on in here that I don't remember precisely what your system consists of.
Now that you've buffered the GC, do you find any benefit to also using the preamp before the GC? Or does the buffer fulfill the role of the preamp?
I've been a longtime owner of the Gaincard and always preferred it with a good preamp. In my case, it's a Cary SLP-94. It would be great to build all of this good sound into a small and simple package.
Anyone tried a GC with an Ultrapath preamp, BTW?
Thanks,
KT
Nuuk said:
Me?
Oh.
Ok.
1. Keep the two channels close one to the other, don't separate them too much.
2. Connect a thick wire from one amp board to the other.
3. Join the two "grounds" coming from the two regulator boards on a middle point of that thick wire (this is the star ground).
It may not be very clear, but look at the pics of my amp, on post #2.
I use a thick solid-core copper wire joining the two amp modules, can you see it?
The black wire that comes from the PSU is the ground and connects in the middle of the two amps, on that wire that joins them.
As always, regulated or not, dead scilent, at min or max volume, with my ear on the speaker.😎
KT said:
I have a special case, my power amp is 5 meters away from my pre, I need the pre.
If I made an integrated amp (nevermind, I made this😀 ), I would just use an input buffer and a pot before it (and the feeback resistor goes from 220k to 330k).
KT said:
Me too.😎
The thing is, you should have a low input impedance.
Just connecting a pot before the LM3875 (or whatever chip) is a minimalist approach and in theory the way to go, but put a good buffer (be it a good op-amp or discrete) between the pot and the chip and you'll see what happens.
I always had this feeling, I always said this, and this is another proof: passive "preamps" are not for me.
anyone remember this......and for those of you that haven't read it - it's good stuff.........🙂
http://www.stereophile.com/amplificationreviews/54
tbla said:
Yes, I know that article for a long time, it's fun!😎
Very fun to read.😀
And good stuff.😉
"Aunt Corey's Homemade Buffered Passive Preamplifier"
is what I use as pre-amp now...(have used for a year+).
But I have used BUF-04...(and DACT 20k)
Still waiting for the APOX to be de-bugged...
Arne K
is what I use as pre-amp now...(have used for a year+).
But I have used BUF-04...(and DACT 20k)
Still waiting for the APOX to be de-bugged...
Arne K
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