ARC REF10 PS

cygnus x1

Member
2006-09-25 1:19 pm
Hi all,
Has anyone seen a schematic for the 6550/6H30p/Fet power supply used in the REF10/REF3/PH9, or a DIY version? I have and older PH3 (that I'm converting to a PH5) I would like to add this PS...to keep the ARC flavor.
I take it the 6550 is the pass tube, the 6H30p the control tube ...but the Fet ... part of the control circuit?
Anyone know where could I find a R core transformer?
 

cygnus x1

Member
2006-09-25 1:19 pm
I know there was a 6L6 upgrade to a 5881? Not sure what a 6550 would get me other than increased current (along with using a higher current power transformer). The REF 3 supply should work fine. Do you remember the output voltage? Of course I can just build it to find out.

Thank you very much!
 

analog_sa

Member
Paid Member
2002-08-14 1:47 pm
Cascais
Looking at the circuit in post #3 it appears the + and - inputs of the opamp are shown the wrong way. No idea how this has happened.

Opamp noise is hardly an issue at these voltages and while different opamps will sound different the AD797 will likely cause oscillations.

John, have you built the circuit above? I distinctly remember myself building it, but have no explanation why is it wrong as shown.