sacd lover: Are you really that dense Art? Can you name a headphone amp that uses solid state output devices and has an output transformer. Of course not... they dont need an output transformer. But tubes amps can be either OTL or transformer coupled depending on the application. So OTL refers to a tube amp thats.... output transformerless. Your just playing semantics.
Art: Now you are being dense, not me. You said the Bada was not a OTL design. An OTL design is one that does not use transformers in the amplification signal path in order to eliminate the sound degration, however slight, that such a transformer adds. Your saying the Bada is not an OTL amp implies that the Bada is an transformer-coupled-output amp, and this is not true. Why would you want to imply a falsehood and then call me dense for not accepting this falsehood?
sacd lover: ASL believes their transformer design has more dynamics than their OTL design.... so all OTL amps have trouble with dynamics? Thats quite a reach dont you think?
Art: Not a reach at all. Why does ASL need to use a transformer to provide dynamic? Because OTL amps have to take special circuit efforts to compensate for the lack of dynamics involved in not using a transformer. OTL does this by allowing a switch for the listener to make the choice between more natural timbre with less dynamics and power slam, or more dynamics and power slam with less natural timbre. ASL tells you this.
sacd lover: As I already told you, my Singlepower amps have better dynamics than any of my previous solid state amps... and I have owned several. Go listen to a Singlepower SLAM ppx3 or mpx3 and then tell me an OTL amp has inherent dynamic limitations.
Lastly, I dont think you have a clue what the huge cap in the Bada does. So I dont know how you can comment as to its effect. I am not sure you even know what a cap is. Are you calling the transformer on the Bada amp a cap?
Now that I looked at the Bada pic I dont see any resevoir caps resembling those on the Singlepower amps. I see a power transformer encased in a round metal cover.
Art: If you think the huge three inch high and five inch diameter capacitor is not a power cap but is instead a transformer, then you lose your credibilty with me entirely. This is disappointing to me after you earlier gave us such a succint description of hybrid amplification.
As mentioned earlier in this thread, the Bada Chief engineer describes the PH12 has an OTL design that uses a huge capacitor that is worthy of a speaker amp (and the Bada PH32 is the PH12 modified as a speaker amp that puts out 100 watts of power - 50 watts at each channel, at 8 ohms - not just at 4 ohms, mind you).
As far as the purpose of this capacitor - you well know it stores power on a temporary basis to draw on in amplification.
The OTL Supra design uses such a huge capacitor to provide needed bass and dynamic slam in compensation for inherent deficits in this regard of the tube OTL design. The Bada as a tube-MosFet hybrid OTL design also uses a huge capacitor even though all other hybrid headphone amps do not. The result is tremendous dynamics and bass, with extremely clean reproduction of the most complex musical passages at the highest recorded sound levels, in the Bada PH12.