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

murphyv310 · 4th May 2021, 9:52 pm

Hi.
I use an EZ81 in my stereo 3-3, its been in it for some years now and is well used never had any issues.
The AZ31 is a filamentary valve so will conduct a long time before the EL84's warm up so the HT will rise significantly. Go for the EZ81 off a separate 6.3v winding. or a GZ34 off a separate 5v winding.

The heater insulation is good enough on both the above valves to run off the normal heater supply and the GZ34 will run via suitable dropper resistor of 1.46r or 1.5ohms happily

4th May 2021, 9:52 pm	#17
murphyv310 Dekatron Join Date: Sep 2006 Location: Kilmarnock, Ayrshire, UK. Posts: 5,422	Re: AZ31 as rectifier for a stereo Mullard 3-3? Hi. I use an EZ81 in my stereo 3-3, its been in it for some years now and is well used never had any issues. The AZ31 is a filamentary valve so will conduct a long time before the EL84's warm up so the HT will rise significantly. Go for the EZ81 off a separate 6.3v winding. or a GZ34 off a separate 5v winding. The heater insulation is good enough on both the above valves to run off the normal heater supply and the GZ34 will run via suitable dropper resistor of 1.46r or 1.5ohms happily __________________ Cheers, Trevor. MM0KJJ. RSGB, GQRP, WACRAL, K&LARC. Member