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could be interest in hibryd class d amplifier otl with tubes in the output stage ? ( working in the real world )
The David Berning Z amplifiers are sort of "tube class D"
The issue has mostly to do with what tubes could survive the current required, but it would have many of the advantages of solid state in that the tubes would run cool.
Ralph , you are absolutely right.I have started the design just for fun.
iF you think in something reliable in high frequency ,wich sustain certain overloads without going to the other world in microseconds ,you can choose a tube.Of course i use pentodes of tv deflection (but i can use others with different eficiency ).with the normal tubes im in the range of500 ma to 800 ma at the knee(in the range of 50 volts,depending screen2 voltage ).could be useful ( if somebody want use it for work )for PA sistems or electrostatic (here capacitive load form part of the output filter ).its amazing to see the locus point of operation , you look two points and the transit its done in the order of nanoseconds ( fraction of microsecond ).In the years i have design and constructed power amplifiers (1983-1988)
for PA i have found the most horribles reactive loads at the output i use at the output my autotransformers to keep the 100 volts line( like Mc Intosh ). Frank congratulations for your amps, well done !!!!
Isn't the point of a switching amplifier to improve output stage efficiency?
I can see using tubes in the front end as you find with other hybrids, but not high feedback switchers.
work in very reactive loads specially adapted for 100 volts line in PA systems.
I'm thinking that most sound reforcement guys won't be using tubes today.
I do, however, find that VTL tube amps have worked very well driving my electrostats. :)
yes , probably its a melancholic design because i have on the bench of my lab 100 years of electronics devices and you can choose what you want to achieve an objective(for example i work today with magamps in mid frequencies ).anyway its interesting to see how a non linear tube or a very good one gives to us only switch caracteristic and all became similar(except for knee points ,voltage and currents)and eficciency of course.you can forget the SOAR available in the device.
Ħit was for fun...!żits not enough reason ?
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