[John L Stewart]

This one was built in the 60's. It has both +ve & -ve rails for the error amp. Stability depends on the 85A2 gas regulator & the current sampling resister. Not sure but it is probably a 50W Dale, Hi stability.

I can't remember where this was used. There are a lot of appplications for constant current supplies. You can see the primary elements of the cct are the same as a constant voltage supply. Very few changes required for the conversion. With 6X807 in pentode mode as passers there is lots of power available.

The whole thing covers several pages so doesn't fit well here on Audio Banter. And my hand drawn schema are fading with age.

Perhaps Patrick T could give us his take on it!

Cheers to all, John