OK.
No. This would load the secondary and drop the level enormously.Trying to find the secondary load resistor on the GA80071. I injected sign wave 1khz into primary leads, and put variable resistor between the secondary leadds and measured with an oscilloscope while turning the resistor ohms...
510ohms is where the waveform looks like the cleanest. Does this mean I need a 510 ohm resistor permanently soldered into the circuit across the secondary leads in place of the variable resistor?
I see the steps by Jensen in that thread you linked. Im gonna give it a shot! Thanks Abby!In series.
I LOOOOOVE Cinemag. But this project isn't something terribly important. It's just a spare board that was from a dead unit I had lying around, that I would poach parts off of and learn on, especially how multi-layered pcb's work and how the traces can short out between the layers and how to fix it. So I thought id use some spare parts I have accumulated over there years and create a working unit. All the while trying to optimize performance and make some experimental changes to each section (mic preamp, compressor, eq, master out). So with $0 dollars spent, I managed to trace the short in between the layers, repair all the ripped off pads and traces, make some changes, get it operational, AND learn alot from you guys here on this forum. So thank you everyone!This is kind of off-base and probably already well-known, but the guys at Audio Transformers By Cinemag Inc. make some phenomenal parts, including transformers using "rare" metals.
They have quite the lineup already, but they also do custom stuff. I can't remember who I spoke with when I called to order a CM-2461NiCo mic output transformer for a tube mic build that I'm currently sourcing parts for. He was great to talk to, patient with me, and very knowledgeable.
They had to make mine as there weren't any on the shelf, so it took a few weeks to arrive, but it's beautiful! I will be going back for other parts when needed. From my perspective, they do a great job, so maybe not a Japanese part that you're looking for but made in America still stands strong for some companies, and Cine is one of them.
I recommend giving them a call and talking through your needs. Maybe you'll find what you're looking for right here in the US. Sorry if this is out of line or not allowed (sharing links). I don't work for them, I only ordered one part, but I was extremely impressed. Hope you find what you're looking for. Good luck!
What would I need to know -- some basic formula maybe or experience with comparable transformers -- to be able to deduct those 'suggested' numbers by myself?The -0.5dB@50Hz suggests -2.5dB @20Hz, -3dB@18Hz
The LF response of a xfmr is in first approximation, that of a 1st-order high-pass filter.What would I need to know -- some basic formula maybe or experience with comparable transformers -- to be able to deduct those 'suggested' numbers by myself?
This is not the way things work.That is a schematic to the normal method of making signal transformers called interleave winding. Even a speaker output. So, for instance, you might have a 4 ohm center tapped at 2 ohm (which is two two ohm windings tied in series as a coil set) Then a set of 4 ohm that is tied in series started at the 4 ohm connection to make 8 ohm tap, then a set of 8 ohm coils tied on top of that at the terminal for a 16 ohm.
Check post #23. Nobody followed.I was just making an example. Interesting that it went so many pages without anyone explaining the transformer schematic.
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