SC944-05LF Top View
SC944-05LF Bottom View
SC944-05 is a handcrafted transformer made by Scientific Conversions. The suffix LF stands for Lead Free.
SC944-05 Waveform
SC944-05 @ 200mv/100ns Div
SC944-05 @ 200mv/50ns Div
SC944-05 @ 200mv/25ns Div
Since the Vpp of the original waveform is around 3.3V, with PE65612 (1:1), I have to use resistors to decrease the output voltage level to 600mV. In the test above, those resistors were not removed, I think that's why the peak will be lower than the second one. If the listening experience is better than PE65612, I'll remove those resistors since they are no longer required due to SC944-05's primary/secondary ratio - 2:1.
PE65612 Waveform
PE65612 @ 200mV 25ns
Obviously, SC944-05 has less noise than PE65612 with nearly the same rise time. However, the jitter is not something we can see directly from the oscilloscope, but I believe that my ears will tell.
Listening and Conclusion
The listening experience of the SC944-05 is all positive, better resolution, more clear and accurate bass and the harmonics compare to PE65612.
I'm pretty sure that I'l never go back to PE65612 definitely!
Note for Usage
The pinout for SC944-05 is almost the same with PE65612, you can replace Pe65612 with SC944-05 directly except for SC944-05 needs an additional hole for its pin 2.
The pin 2 is for "shielding", which connects to the shield between the primary and secondary coils.
Th shielding will greatly improve the noise suppression, hence, except for creating an additional hole for SC944-05 while replacing the PE65612, remember to connect the pin 2 of the SC944-05 to the ground of the primary on transmitter side, and to the secondary ground if used on the digital receiver side.
Updates
After 3 hours running-in, I got new conclusion:
PE 65612 is NOT comparable to SC944-05, they are not at the same level!
