Build an F3 - will stop you sitting - remarkable amplifier.
If you do, suggest use 220uF Rifa peg124 Capacitors instead of the Silmics - add a 1mH /2mR choke instead of the power supply resistors (C-L-C)!
If you do, suggest use 220uF Rifa peg124 Capacitors instead of the Silmics - add a 1mH /2mR choke instead of the power supply resistors (C-L-C)!
coloradosound said:
I'm a Circlotron type too. I'm so happy to see this thread revived 😀 😀 😀
My prototype was IR MOSFET parts (no Lovoltechs) but, the properly assembled version I let sit for a while... And it's still not operating... DC stability could have been better... Needs a servo...
When I first heard, I searched. It's there...
Let's keep this thread going. UGS, GR-25, or any JC type comp front end would work great. I used a high voltage BOSOZ circuit for mine...
😉
It sounds interesting. I have some Acoustat 2+2's and
Carver B&G ribbons and want to build something interesting
to drive one or both. I ordered at least 30 of the LU1014D's
and had a guy from our machine shop make little mounts
from some thick copper stock I had laying around.
(has a machined surface carved in where the JFETs can lay down
inside, then I can solder them to the copper, then screw holes
out to the sides so I can attach them to real heatsinks)
I certainly believe an F3 would do nice for my Coral Beta 8's
(which I plan on doing two per enclosure with perhaps some
Heil AMT's sitting on top), but I do plan on consuming (and
hopefully not blowing up) some if not most of the LU1014D's.
Also just joined that GB for the LSK170's (100 B grades and
another 100 A grades)(No, not selling till I pick through!)
heeeeheee!
Certainly agree with keeping the thead going, flg, but don't
want to see it get as long as the ESS sabre threads
Carver B&G ribbons and want to build something interesting
to drive one or both. I ordered at least 30 of the LU1014D's
and had a guy from our machine shop make little mounts
from some thick copper stock I had laying around.
(has a machined surface carved in where the JFETs can lay down
inside, then I can solder them to the copper, then screw holes
out to the sides so I can attach them to real heatsinks)
I certainly believe an F3 would do nice for my Coral Beta 8's
(which I plan on doing two per enclosure with perhaps some
Heil AMT's sitting on top), but I do plan on consuming (and
hopefully not blowing up) some if not most of the LU1014D's.
Also just joined that GB for the LSK170's (100 B grades and
another 100 A grades)(No, not selling till I pick through!)
heeeeheee!
Certainly agree with keeping the thead going, flg, but don't
want to see it get as long as the ESS sabre threads
coloradosound said:
Favorite New-Tron...hmmm...probably tomorrow's...
I rarely, if ever, comment on sound quality of my fiddlings because no one knows my hearing and my system is not something someone could easily reproduce, even if they wanted to. There's also the fact that I'm never satisfied; always on the move (albeit slowly...think glacier, not hummingbird).
The GR-25:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=120673&highlight=
It's a 25W (heavily, heavily biased...keeps doubling in power down to around 2.5 Ohms), pure class A, all FET, zero feedback design. Note that the thread is quite short (not unlike this one), which indicates to me that though a lot of people say they're interested in zero feedback, it's only in a theoretical, arm's length sort of way; they only want to talk about the circuits, not build them.
That's okay, I've got mine, and ideas for another four or five variations on the basic theme. All I did was do a writeup for something I was already working on, anyway.
flg said:
DC offset need not be a problem, and it need not require a servo. In most direct coupled amplifiers it's handled by the feedback loop. Assuming that you're using feedback (and most people do--the GR-25 is very much the exception, not the rule) then look to the feedback loop if you're having DC offset problems.
Note that a lot of DC offset problems can be managed simply by keeping the devices at a stable temperature.
Grey
Well, as long as it was mentioned... I have a set of R1 ribbons I thought might be good on mini circlotron or the F3 🙂 Any other ideas?
😀
😀
I whomped up the GR-25 for the express purpose of driving my ribbon tweeters. That's not to say that a variation on the New-Tron won't do the job as well. I think the whole Circlotron thing is kinda neat.
Grey
Grey
This thread is over 2 yrs old!
I would imagine it's time to put a Circlotron together with SemiSouth Jfets.
I would imagine it's time to put a Circlotron together with SemiSouth Jfets.
I already have a few ideas which I have been thinking about. If I get the time I will upload a proto design or 2. I am sure Zen Mod has already built 7.
I have to bone up and get my head completely around the Circlotron. I'm pretty much a SE guy, but this might be worth the effort. The price of the SS jfets is now more realistic to consider, having limited funds (retired).
yes i'm planning ss circlotron also. i may start just by using them in bottom half, with lovoltech up top, then move to all ss when i get some more. i have 4 x matched r550 here waiting for something to make them sing. so its either play with crosscoupled x'd type output stage using them on the panson lme49830 initial series driver board, or on patricks x'd lovoltech circlotron headphone/line amp
There is no reason why you can't use Toshiba, or IR initially espescially if you have these lying around, and then if you are happy with the result fork out the money for the jfets and then tweak the circuit (very easy) for the jfets to work.
yeah thats the idea, but i actually already have IRF, TOSH, Lovoltech and R550 here 'lying around', because i'm going with patrick's 2 stage power jfet circlotron X'd, i'll probably start with lovoltech and 1529 as with his design and then drop in the R550 for the toshibas as a tweak to try them out. i think it would be a very good circuit to really get a feel for their sound. also building up the dao and daox and trying all these out when i have the time
Yes, but unfortunately bad choice of the headline. Therefore only to find by chance for the most readers.
about
http://www.diyaudio.com/forums/soli...ted-solid-state-output-stage.html#post2568968
are more URL's to find arround CSPP topologies.
why bad choice of article headline? its a circlotron, so those looking for a circlotron will find it, i think it will be more rare for someone that needs to search for circlotron designs to search for cross shunt push pull, as its only once you are more involved in the topology that you know they are the same thing.
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