Jewel Theif Inductor

I assembled a Jewel Thief as per the attached image and it worked fine.
I wound a center tapped inductor on a ferrite torus, about 20 turns and it worked fine.
The ferrite is about .75 inch outside diameter and .25 inch inside diameter.

Since idle hands are the devil's playthings, I disassembled an Computer power supply and found a similar ferrite torus with two windings each about 25 turns, which I converted a fifty turn center with a center tap.

I removed the original center tapped inductor and installed the newer one.

Again it worked fine, but I am wondering if this changes the oscillating frequency or operating efficiency or other (?) characteristics of the circuit.

Can't put a scope on it because I don't yet have one.

Thanks

image still didn't upload

I tried editing the post but still no image, so I am going to try uploading via this reply

1) No image is attached.

2) Perhaps you are interested in the Joule Thief? https://en.wikipedia.org/wiki/Joule_thief "Joule" and "jewel" have no meaning in common.

Please do some homework.

John

Unless the two cores are the same size and made of the same type of ferrite both the frequency and efficiency are likely to be affected.