reliable tube/mosfet hybrid amp

[quinnling]

Stuart,

Thanks for your reply ... Thats was I thought ... I've built tube stuff in the past, but rarely touch SS stuff.

I've heard that lateral mos-fet does not have to be that well matched in a set ?
I have 8 Hitachi K176 and 8 J56 - I believed that are graded and matched by the seller.



I'm going to put them in a Counterpoint SA20 Chassis using Denis Output stage and I have an Aikido board octal board stuffed for 12SL7 and 12SN7.

[ben62670]

I was wondering if the Mosscode front end would be able to drive 10 each npn and pnp transistors? I have an Adcom 565 with a bad input board. I would very much like to tube it.
The DC rails are 83+-vdc. I have also thought about tubing my Adcom 545 with the mosfit outputs rated a 100wpc.
Thanks
Ben

[Ivey]

THE MOSCODE FRONT END WILL DRIVE YOUR ADCOM 545. THERE ARE TWO DESIGNS ON THE WEB THAT COULD HELP YOU.

GIVE ME A COUPLE OF DAYS AND I WILL LOOK FOR THEM AND POST THEM IF I CAN

TAKE CARE

IVEY

[MiiB]

I like the digilander circuit...taking the capcitors out of the circuit....can be modified with the mosfets diving a class AB BJT outputstage....

[Bigun]

Originally Posted by ben62670

I was wondering if the Mosscode front end would be able to drive 10 each npn and pnp transistors? I have an Adcom 565 with a bad input board. I would very much like to tube it.
The DC rails are 83+-vdc. I have also thought about tubing my Adcom 545 with the mosfit outputs rated a 100wpc.
Thanks
Ben

Based on my understanding, Yes, the Moscode front end should have low enough output impedance to drive a transistor output stage but distortion may be lower if you add in some driver transistors to further buffer the tubes from the power devices.