RMI-FC100, a single stage audio power amplifier

[roender]

The WIMA MKS series has very low DA

[atiq19]

A comprehensive introduction of the output power transistors used in RMI-FC100 was blogged by John Broskie at his famous Blogg:

http://www.tubecad.com/2006/10/blog0084.htm

[roender]

That design and also ONsemi example too, will NEVER work. It will be way out of thermal stability - to much overcompensated. The diode inside ThermalTrack BJT have TC -1.66mV/C.

[roender]

No one want to build it?

[Triodas]

Do you meen to build you amp?
I'm building it, but I need to redesign PCB design a little for my heatsinks. Don't worry, I'll change output devices location only.
Basic problem - lack of free time.

[roender]

Thank you !
Please be very carefully with output stage PCB redesign. I've spend more than 10 hours to do it
Please don't modify NFB takeoff point!
I'll wait for your feedback

[Onvinyl]

Roender,
I will definitly build it.
Do you have boards to sell? I do not etch myself, so this would be an additional push.
I recently build the symasym and like it a lot, but grading from a tube amp (up? down?) I could do with yet some sweetness *without* loosing definition and slam.

Rüdiger

[spind]

Originally posted by roender
No one want to build it?

I'd like to.....but I'd need some guidance and boards. Are you planning on selling boards, or supplying pdf's that could be used for etching? What is the width of the boards plus output transistors (to check if my my heatsinks are OK). What are the transformer requirements; how much latitude is there with the supply voltages?

thanks,
Steve.

[atiq19]

I'll definately build it but I need a pair of pcb...

[DRZ1]

Originally posted by roender
No one want to build it?

Shure, i am already on it ( pieces supply).

It's possible the pcb must be modified to fit my case. Roender do you have somethink you want to try? I have acces to a milling prototype machine for the PCB, it's more easy than etching it.