200W MOSFET CFA amp

[dadod]

Merry Christmas and a Peaceful New Year

 

[Lbud4]

I am getting ready to build the 200W version of this amp this year - hopefully. I have two questions:

1. What current gain group would you recommend for the BD139/140 BJTs - 10 or 16?
2. What are your thoughts about using a switching power supply with the amp - something like Hypex SMPS1200A700 (63Vdc 100 kHz switching frequency)

 

[dadod]

Lbud4, I use 16 but 10 is OK too.
No problem to use switching power supply, I use it in my 100W CFA ClassA+ClassB amplifier with wery good result.
BR Damir

 

[Alren]

Hello Guys,
Behind your switching power supply, do you add capacitors, or even a CRC system?
If yes, what value for your 100W amp at 63V?

 

[thimios]

Be careful, not every smps accept additional capacitors behind,some not start at all because of over current protection activation.