UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - AZ31 as rectifier for a stereo Mullard 3-3?

Leon Crampin · 3rd May 2021, 7:13 pm

Another vote for the EZ81 if you have sufficient heater current available. There's no need for a separate rectifier heater winding as the EZxx rectifiers are designed to withstand HT between heater and cathode. I have never ever seen a failure in this respect.

AZ31s are a little bit special now, and should perhaps be kept for the bowden cable afficionados who restore the rather splendid Philips sets of old. A directly heated rectifier would not do the capacitors in your amplifier any favours in any event.

Leon.

3rd May 2021, 7:13 pm	#10
Leon Crampin Octode Join Date: Nov 2005 Location: Surrey, UK. Posts: 1,870	Re: AZ31 as rectifier for a stereo Mullard 3-3? Another vote for the EZ81 if you have sufficient heater current available. There's no need for a separate rectifier heater winding as the EZxx rectifiers are designed to withstand HT between heater and cathode. I have never ever seen a failure in this respect. AZ31s are a little bit special now, and should perhaps be kept for the bowden cable afficionados who restore the rather splendid Philips sets of old. A directly heated rectifier would not do the capacitors in your amplifier any favours in any event. Leon.