Help: how to connect the filaments of a tube rectifier and a regulator in a
common souce?
The tubes EZ80 and 12AT7 are connected as follow:
http://www.geocities.com/cycheu/supply.gif

"=B7=E0=A4l=A4f" wrote:

Help: how to connect the filaments of a tube rectifier and a regulator =
in a
common souce?
The tubes EZ80 and 12AT7 are connected as follow:
http://www.geocities.com/cycheu/supply.gif

You don't need to put DC on the heaters of the tubes. That simply
wastes money & applies an extra load to your transformer due to
the harmonic currents presented by the heater rectifier & cap.
Just connect the heaters direct to the 6.3 VAC.

The circuit as shown will not regulate since you have not provided
a voltage reference.

Cheers, John Stewart

A OD3 will be connected for reference.
How about the heater? Should I connect one end of the 6.3V
to the ground or some voltage around 250VDC, or just let it floating?

"John Stewart" ...
You don't need to put DC on the heaters of the tubes. That simply
wastes money & applies an extra load to your transformer due to
the harmonic currents presented by the heater rectifier & cap.
Just connect the heaters direct to the 6.3 VAC.
The circuit as shown will not regulate since you have not provided
a voltage reference.
Cheers, John Stewart

"=B7=E0=A4l=A4f" wrote:

A OD3 will be connected for reference.
How about the heater? Should I connect one end of the 6.3V
to the ground or some voltage around 250VDC, or just let it floating?

"John Stewart" =BC=B6=BCg=A9=F3=B6l=A5=F3=B7s=
...
You don't need to put DC on the heaters of the tubes. That simply
wastes money & applies an extra load to your transformer due to
the harmonic currents presented by the heater rectifier & cap.
Just connect the heaters direct to the 6.3 VAC.
The circuit as shown will not regulate since you have not provided
a voltage reference.
Cheers, John Stewart

Heater-Cathode insulation rating for the EZ80/6V4 is 500 volts
so connect one side of the heater winding to the 12AT7 cathode.

Cheers, John Stewart

Thanks

"John Stewart" ...
Heater-Cathode insulation rating for the EZ80/6V4 is 500 volts
so connect one side of the heater winding to the 12AT7 cathode.
Cheers, John Stewart