Moderator: jadis
joan2 wrote:For flyback, it is when MOSFET is off that energy is transferred to the secondary unlike forward topology which has same waveform as secondary. My question is, for tubes is it a flyback or forward topology?
you don't ask questions like these, smps operates in the non-linear region, the switching devices, be they tubes, bipolars, mosfets or igbt's are either on(saturated) or off(cut-off), never in between.
amplifiers operate in the linear region, (ask S_B) of their characteristics curves.
it is a no-no for tubes and transistors to saturate nor be in cutoff, distortion rises abruptly in such cases.
Sorry if you got me wrong ... I was referring to the transformer topology. My guess is for tube design the transformer is configured as "forward". Primary voltage is in phase as secondary. I don't think it is flyback, cause problem of flyback transformer is very high fly voltage.
Understand amplifier design is different from SMPS and that it is operated in the linear region not at saturation and cut-off. Not much but I've already designed (and using) an SS buffer on my CD player. Am thinking of upgrading the constant current source using TL431 voltage reference. Do you think this is a good idea?
Anyway, I am now reading the RCA tube manual and taking a good look on how our magnetics people wind transformers and asking them if they have special winding techniques. I only know how to wind toroidal chokes. BTW, do you know of any local sources for transformer cores? And how do measure inductance without an oscilloscope or an inductance meter?
Saw some tubes at Eleshop in Raon, is it a good place to buy tubes? I mean how do I know that they are selling original parts?
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