Hello,
I recently purchased a SOLA Ferroresonant tranformer that provides a 170VDC output (confirmed with oscilloscope and 10x dividing probe).
The devise is bulky and weights about 25lbs. The device is comprise of a bulky isolation transformer and its 660v tank capacitor. Mains leads to primary and secondary leads to another 1500MFD 200V Cap with a bulky 2K resistor that gets realy realy hot when the device is powered!
My question:
How can it output a 170vdc without a diode bridge??? The above listed parts are the only one that I can see.
Best regards.

 

You must have meant: ”How can it output a 170vdc without a diode bridge?”

To answer the riddle:
Please post clear photos of the unit.

 

You are correct ... typo on my end.
From what I can see from the visible parts I can only see a resistor a capacitor and the transformer’s tank circuit capacitor. Would it be possible that the diode bridge is inside the transformer casing?
Regards.

 

It looks like a set of four rectifier diodes near the terminal strip. From the bottom view I can see a bleeder resistor for the filter capacitor.

 

Where do you see diodes ? I looked every where !! :/

 

Got it!!!
Man that was to obvious to see

 

4 Stud Diodes with Yellow wires next to the Capacitors first pic.

1N1202

 

Hello,
I recently purchased a SOLA Ferroresonant tranformer that provides a 170VDC output (confirmed with oscilloscope and 10x dividing probe).
The devise is bulky and weights about 25lbs. The device is comprise of a bulky isolation transformer and its 660v tank capacitor. Mains leads to primary and secondary leads to another 1500MFD 200V Cap with a bulky 2K resistor that gets realy realy hot when the device is powered!

It normally runs hot because it runs in saturation mode, any load takes it out of saturation to a degree, this is how it regulates, they are not very efficient!
Max.