Heed Canopus

[neodyne]

Hello, my best wishes for this new year 2024!

I wanted to know for the offset measurement, it is done in mV cc or ac?
I could not go below 40mv but I listened to the amps, they work perfectly without noise and without any heating, it’s strange?

 

[lcsaszar]

I found this thread with circuit diagram:
https://www.hobbielektronika.hu/forum/heed-canopus-obelisk-hta-30?pg=0
Sorry it is in Hungarian (as the construction itself) but perhaps useful.

 

[neodyne]

Hi, thanks for sharing, but this does not match, the power transistors are BD249C and BD250C

 

[Remnant Parts]

Maybe this?

 

[neodyne]

Yes, it looks like that!