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However if your current requirement is low or you definitely need to implement a few ohms of

inductance free resistance in the line, this coupling method is your choice. The wiring of this

variation is also much more simple.

Parallel coupling of two pole and four pole electrolytics is just straightforward.

The only rule is that the two pole capacitors must be connected to the input terminals of

the four pole. The transfer impedance of the system depends only the resulting capacitance

and can be calculated as it is described above.

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INPUT OUTPUT

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- I have a tube amplifier and I need electrolytic capacitor with a rated voltage above 600 V.

Thus you don’t have fire pole capacitors of this rated voltage if I serial connected two 385 V or

three 250 V fire pole capacitors I could reach the desired voltage. Is it a work around of the

problem?

No, we do not recommend series connecting of our four pole electrolytics.

The voltage on the series connected electrolytic capacitors is divided in proportion of the

capacitance of the capacitors. Thus the capacitance tolerance of the electrolytic capacitors is

generally rather wide (-10/100% to –10/+30%). it could happen that one of the series

connected capacitors get a higher voltage, than it was originally calculated to.

The voltage overload reduces the lifetime of the capacitor, make unbalances in the circuit and

in worth case might make the capacitor to explode.

There are of course work arounds for the problem as i.e. using capacitors with very similar

characteristics or the application of bleeder resistors in parallel connection with the capacitors.

In spite of that this solutions might work satisfactory in different power applications as welding

machines and laser equipments, they are unacceptable for high end audio applications.