• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Using vintage OPTs as PSU chokes ?

Anyone used old scrap vintage output transformers as power supply chokes ?

I have two old Siemens SE OPT´s with following data:
Primary induktance 5H (measured with AC only)
Primary resistance 250 Ohm
Measure aprox. 2x2x2"
I don´n know the DC rating, sins my L-meter only measure with AC (1000Hz), but the OPT´s where used with EL86, so I guess thay must handle ~30mA DC

I know, 250 Ohm and only 5H seems like a bad choke, but sins I plan to use VR tubes as voltage regulators the series resistance in the chokes will be subtracted from the series resistor -limiting the VR-tube current- anyway.

I will pull aprox. 30-40 mA DC though my PSU and It will be a LCLCR(VR) design

I guess the OPT cores are of higher quality, and that the winding had been done more seriously than the average Hammond choke, and that perhaps some benefit as wider inductive frequency range (ordinary scramble winded chokes has a limited frequency range caused by capacitance between windings)

Anyone tryed this ?
Could an old OPT be used this way or is it just a waste of time?