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Yamaha GA80281 active crossover trans phase of wiring?

Posted on October 24, 2023 at 09:04:32

Posts: 717
Joined: August 21, 2002

Anyone has got a guess on these these phase of these trans? They were removed from yamaha pro active crossovers I believe there 600ohm 1200ohm Red brown low side blue purple high side. Brown and blue are possibly outer bobbin winding brown and red are the 600ohm and the blue and purps are the l200 ohms for the balanced conversion. Maybe I'm wrong with the impedance it was 15 years ago I pulled them out. They were the 600ohm output(neutrik) with a floating ground and solid state amp driving them on the low side if I remember right. Anyone know which should be the leading phase. My guess is red* and brown and purple* and blue help please.

edit dcr of these 45 and 66 ohms thinking about it their probably 600-600 just one side is on the outer bobbin does that make sense? I need to get an oscilloscope I'm starting to get back into the groove of working on them again. I could so quickly work out if they are worth using.


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"if they are worth using", posted on October 24, 2023 at 12:35:14

Posts: 2598
Location: The South
Joined: December 24, 2012
They are just line audio transformers; 600 ohm transmission standard for professional equipment. Typically, these types of transformers are there to solve impedance issues on long cable runs, they are not used in the "audiophile" world unless you have a very long distance between your preamp and amplifier and you have a problem with bandwidth and noise from the long cables. They generally make the sound worse, but much better if you have the problems they were designed to solve.


RE: Yamaha GA80281 active crossover trans phase of wiring? , posted on October 31, 2023 at 00:03:46

Posts: 97
Location: Amarillo Texas
Joined: October 21, 2023
October 31, 2023
well color can be difficult use a dvm to test polarity. they are what we coupling or impedance matching transformers not powered usually used on tube amp outputs


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