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Who tried Class D only to return to S/S or Tube


And what were the reason you did a backflip back to S/S or tube.
As there are a few pro Class D threads being hammered at the moment, I thought I'd put this up, to get some perspective.

Cheers George
128x128georgehifi
kuribo
524 posts
 
Have you heard an Ncore, Pascal, or Abletech based amp? I have. They have all been reviewed very positively with no complaints about switching frequency artifacts. Perhaps future products will operate at high switching frequencies, but that is no panacea as high rates introduce other issues. Read Putzey’s papers on class d design. He addresses switching frequency. With the audio quality attained with these modules, your switching frequency concerns are a solution in search of a problem....
georgehifi's avatar
georgehifi OP
10,312 posts
 

Once again I ask you the question, simple yes or no will suffice.

"Your saying is that there will be no higher switching frequency developed in the near future for Class D and what's now being used is enough"???


Cheers George

kuribo
524 posts
 
I have answered your question already. Reread above...

guidocorona
4,298 posts
 

George, the answer is... Yes, the current switching frequencies of approximately 500KHz in the power conversion modules are sufficient for some OEMs to implement some marvellous-sounding amps.... Kuribo and several others have already mentioned some example brands and models.


Having said this, and knowing how things proceed in technology, the word "enough" hardly ever applies, no matter where one stands in the evolutionary curve. Whether a switching frequency increase of 5X or 10X yields an audible enhancement or not, such featture will eventually be introduced at some time in the near/medium/long term future by module and SMPS manufacturers.


And with such next gen component parts, some OEMs will create even superior amps... While other ones will persist to develop "Creatures From The Black Lagoon", and all in between.


'Tis all in the handle, George!


G.

ait
480 posts
 
Kijanki, in your zeal for Class D I'm afraid you mischaracterize linear power supplies. Not all are cap input.

Choke input linear supplies do NOT draw power in "huge narrow spikes". In fact they draw power continuously throughout the conduction cycle, resulting in smooth, fast and clean power delivery. No "huge amount of capacitors" are needed since choke input supplies have very good inherent regulation.
I use choke input in everything I build, including amps, preamps, DACs, even for DC IDHT tube heaters. Best feature though is no RF nasties flying around the room, which are inevitable with high frequency switchers.
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