Well, the first thing to remember is those tiny little circles mean the same phase. So, someone else noticed this is different than we've been exposed to before? I've been confused with Drain resistance all day. Maybe this is Push-push? Have'nt heard that in years!
I will hazard a guess that the answer is yes, but I really spend almost no
time listening to Class AB anymore.
I will hazard a guess that the answer is yes, but I really spend almost no
time listening to Class AB anymore.
Well you have the golden ear. I'm just trying to beyond the F5 to maybe 50 watts.
Audiophiles & publications have been debating transformer or no transformer since the beginning of time. Well at least the beginning of the 90's. Input transformers, interstage, output, phono step-up transformers etc.
Just when everyone seems to have forgotten them, a product with transformers starts the debate again.
Just when everyone seems to have forgotten them, a product with transformers starts the debate again.
There's certainly a lot of merit in checking out this topology - using +/-24V rails I get 32V pk-pk @1% THD out of a single pair of toshiba latfets in a simple push-pull config ala ZV5 (i.e. common source not current follower) if the mosfets are driven directly by a tx. A very thorny problem is driving the transformer .. if you make the output stage biasing network low impedance (to tackle the HF response & HF distortion,) the reflected load into the primaries becomes very significant .... my Benchmark DAC does a good job but other preamps just go phffwwtt .... seems to me that this project will provide the answer ..... wishing the F6 was out a week earlier!
Last edited:
the only disadvantage that comes to me in mind is the more difficult design for the driving transformer cause present dc voltage bias.
But what about a small signal circlotron push pull input stage?
The combination of the Semisouth I heard in BBA-1 and Aleph-J and and interstage transformer like in Magma ( F4+transformer, similar to M2)
could combine the best of two worlds and really be a dream......!
I don't know the martked devices. Google provides no helpful results in combination with "Firstwatt"
BTW - concerning interstage resp. driver transformer I have found this old paper:
http://www.freepatentsonline.com/3142807.pdf
and
http://www.sanshinechina.com/eng/show_news.asp?id=351&pid=8
http://www.geofex.com/article_folders/voxamp/voxprot.htm
http://www.scribd.com/doc/50982632/0-5-4-push-pull-amplifiers
(design of audio transformers)
Is
http://www.sowter.co.uk/#
a good choice for this kind of transformers?
Last edited:
Hallo tiefbass,
kleine Fehler....small errors, of course I meant Burning Amp-1, sprich BA-1, I was confused by BBA-3!
and the Magma was a nice try to combine F4 and an autoformer, to have a M2 like combination without feedback......
http://www.diyaudio.com/forums/pass-labs/188109-introducing-magma-front-end-ba-2-f4.html
audio rob used a Jensen Transformer JT-13K7-A and published some data...
Gerd
The combination of the Semisouth I heard in BBA-1 and Aleph-J and and interstage transformer like in Magma ( F4+transformer, similar to M2)
could combine the best of two worlds and really be a dream......!
Hey generg.
Have you listened to the BA1, actually more importantly have you listened to the Balanced BA1 in isolation to the front end, using semisouth on output?
That is my next plan, along with this F6, and Balanced BA3.
I now no longer need gain, so my gut keeps telling me to go with balanced single ended source follower (ie power buffer) or source follower circlotron.
I am falling behind now. There are so many ideas to try.
I love this F6 schematic.
Last edited:
Found an article on OTL. Please find attached in this thread and continued in the following one.
