1000W PA Quasi NMOS Amp - Class H Stepdriver possibile ?

[NMOS]

Does somebody have experience or ideas

I want add Class H Rail Step driver for quasicomplementary NMOS amp 60/110 V DC?


but I remember in the past some diy member told me quasicomplementary amp does not working with class H Stepdriver (amp will oscillating in negative rail and burn up) ....but I think this information is not true , because its working in commercial NAD 208 70 V / 120 V Rail

NAD 208 is commercial Class H quasicomplementary NMOS amp

I think it can work if add Class H Step driver from apex member (900 W PA amp with limiter thread )

ANY ideas to increase efficiency for NMOS amp ? I dont like BJT output stage

[Tekko]

Whats wrong with bjt output stages ? I say the opposite, i had a go at mosfet output but dident like the sound, maybe for a subwoofer amp but thats it.

I've also seen somewhere that for high output power, bjt is preferred over mosfets.

And i seem to prefer the sound from complementary mjt over quasi mosfet.

[NMOS]

Originally Posted by Tekko

I've also seen somewhere that for high output power, bjt is preferred over mosfets.

And i seem to prefer the sound from complementary mjt over quasi mosfet.

bjt devices cheaper is mass production by chinese manufacturer this is true

but not in sound, really... have seen many commercial poor sounding bjt amps

and often fails with secondary breakdown.


mosfets are much more rugged and free from secondary breakdown

if you want share your bjt design, and im satisfied with bjt sound it can be it changed my views but actually...bjt amp no way,... only for bass but big risk of secondary breakdown with high output power

For high current i prefer mosfets

[khalsa]

POSSIBILE

[NMOS]

Originally Posted by khalsa

POSSIBILE

Thank you for schematic, did you test it in real condition ?

can you send me your email adress ?

[khalsa]

HI NMOS i am not test but I now any bjt transister audio amp is working good condition no problem enjoy khalsaaudiocenter@yahoo.com

[Robert GS]

Originally Posted by NMOS

bjt devices cheaper is mass production by chinese manufacturer this is true

but not in sound, really... have seen many commercial poor sounding bjt amps

and often fails with secondary breakdown.


mosfets are much more rugged and free from secondary breakdown

if you want share your bjt design, and im satisfied with bjt sound it can be it changed my views but actually...bjt amp no way,... only for bass but big risk of secondary breakdown with high output power

For high current i prefer mosfets

I am very satisfied with BJT sound in my amplifiers and I haven't had any secondary breakdown yet in any of my amps sold commercially.
I have a proto type Class H doing + 2kW peak i 2 ohms with "only" 4 pair BJT and 2 switch MOSFET also tested in reactive and capacitive loads - not problem. It beated 2 x 1000W Class D RCF it was AB tested against
- so I think it's a matter of implementation

Regards,
Robert GS

[khalsa]

HI GroundSound I now its tru

[andrewlebon]

hi khalsa
greetings nice schematic can you tell schematic is of which company and values of 2sa transistors and the 2sc ones
thanking you
andrew lebon

[khalsa]

transister use 2sc5200 TOSHIBA