Nuuk,
Monica2 is usually connected to 50k stepped attenuator between 41hz amp3 with highest possible gain chosen. The amp3 then feeds an AE 89db(I think) loudspeaker. Added a Ribbon Foster superTweeter crossed with 1uf and attenuated with 3db lpad. Transport is usually Njoe Tjoeb or Sony DVD.
Monica2 is usually connected to 50k stepped attenuator between 41hz amp3 with highest possible gain chosen. The amp3 then feeds an AE 89db(I think) loudspeaker. Added a Ribbon Foster superTweeter crossed with 1uf and attenuated with 3db lpad. Transport is usually Njoe Tjoeb or Sony DVD.
OK, that's what I thought!
Now, when I fed the output of Monica2 into a 25K stepped attenuaor and then into one of the class-T amps, I often found that I didn't have enough volume. So I added a buffer between the attenuator and class-T amp and now it is loud enough. And guess what - the buffer has no gain!
So do you have a buffer or active pre that you can try this with? I would like to hear if somebody else has the same results!
Nuuk,
No buffer nor active pre on hand.
Just waiting for your review of tube pre for t-amps to get one
What bothers me is the sound of breaking waves/ sweeping noise on ONE channel when I connect Monica2 to amp3 directly. If this is an impedance problem, should have been on both channels, no?
I have a another amp3 lying around that I could check to see if I get the same problem.
No buffer nor active pre on hand.
Just waiting for your review of tube pre for t-amps to get one
What bothers me is the sound of breaking waves/ sweeping noise on ONE channel when I connect Monica2 to amp3 directly. If this is an impedance problem, should have been on both channels, no?
I have a another amp3 lying around that I could check to see if I get the same problem.
Just to share
I hooked up my monica2 to a 12b4 linestage and it drives the gainclone quite well. Apart from the small microphonics, it doesnt lose too much of the transparent qualities of monica2. Treble is slightly airier.
I dont have the charlize on hand, but i THINK it should work as well.
I hooked up my monica2 to a 12b4 linestage and it drives the gainclone quite well. Apart from the small microphonics, it doesnt lose too much of the transparent qualities of monica2. Treble is slightly airier.
I dont have the charlize on hand, but i THINK it should work as well.
Nuuk said:
Nigel, I haven't tried 13.5 volts myself but the 12 volt/6 amp SMPS that I have been using seem more than adequate for a class-T amp!
Thanks Nuuk. I suppose 13.5v might be the differents for the air ciols in the dynamics department. I am just finding it to be to polite. Plenty of detail. At the moment its not still not my el34ppp. But I am willing to invest the time and money to see if it can be
Nigel
barfind said:
No worries, I am near Byron Bay, if your ever up this way come and have a listen!
!3.5 volts is ok but 18 amps is waay overkill.barfind said:
I did try one of my Autostruire 2020 amp on a big Lab ps i have that outputs up to 40 amperes but the ps digital display never showed more than a 2.2 ampere max draw .
The nemic lambda smps (ebay $20 a pr from WA) i use now are 2.8 amps max and actually sounds better than the big lab supply did. (more open and better deep bass)
dave e
You may have told me something useful there Mr Dodo. While I have been listening to all this new stuff, ie class-T amps andMonica2 DAC, I have found myself constantly wanting to change the phase on my subs! That would explain why!
The strange thing that I have found with the class-T amps is that there is very little difference whichever way I have the subs connected whereas with the GC's, it is quite audible which is the correct phase!
The Tripath is indeed an inverting amp. All the documentation says so. I've had a look at the output on a scope and can confirm this.
But it's not quite so simple. Phase seems to shift around dependant on frequency. Running a 20-20KHz sweep and looking at phase will startle you! It's all over the place. Maybe that's why the sub phase doesn't seem as out of place to you.
Earlier this year I was discussing this with Scott Nixon who said that he had noticed it too, but that it didn't seem to effect the sound. Curious.....
Maybe as I dig deeper into filters I will test filter phase too.
But it's not quite so simple. Phase seems to shift around dependant on frequency. Running a 20-20KHz sweep and looking at phase will startle you! It's all over the place. Maybe that's why the sub phase doesn't seem as out of place to you.
Earlier this year I was discussing this with Scott Nixon who said that he had noticed it too, but that it didn't seem to effect the sound. Curious.....
Maybe as I dig deeper into filters I will test filter phase too.
The weakness of the SE OTL is the low power but on the correct speakers it is no longer a weakness
It is simply a fantastic amp.
The Charlize is still breaking in. The bass which I found too prominient at first no longer seems that way. I don't think the bass has disappeared but maybe the mids have come out some more, at any rate it is now sounding more balanced.
Charlize still does not have many hours on her so it is still too early to make a comparison but I can safely say I cannot find anything wrong with the sound thus far. I am still using the smps from the PC but plan on trying another smps.
The only fault they both may have is that they are so inexpensive that
many people will dismiss them (their loss).
Andrew
Just ordered some goodies from Steve at Apexjr.com including two 12V@6.3A SMPS which costs just US$12.50 each and some caps 10000uF@63V US$1.50 so for anyone sitting on the fence regarding an SMPS there is no reason not to try it at these prices.
I am still using my PC SMPS so will be able to compare them when the new one arrives.
Andrew
I am still using my PC SMPS so will be able to compare them when the new one arrives.
Andrew