5k:8 ohm vs. 10k:16 ohm output transformer. What is the difference? - diyAudio
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Old 12th July 2012, 12:12 AM   #1
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Default 5k:8 ohm vs. 10k:16 ohm output transformer. What is the difference?

EDCOR - GXSE15-16-10K

EDCOR - GXSE15-8-5K


Could somebody please explain to me what the differance between an opt 10k into 16 ohms vs 5k into 8 ohms? It seems like they would be the same. Maybe the primary dc resistance is higher in the 10k:16 ohm version because of smaller wire?
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Old 12th July 2012, 12:26 AM   #2
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Yes, also primary inductance is different, and voltage on which it saturates on low frequency is different. Also, loss inductance on highs and stray capacitance are different.
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Old 12th July 2012, 06:05 AM   #3
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So a tranny designed for 16 ohm and 10k used for 8 ohm and 5k would have more low end but have less highs then? Or the other way around?
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Old 12th July 2012, 09:43 AM   #4
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Yes, more low and less high. But possibly greater DC resistance too, so more losses. Might saturate at a lower DC current.
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Old 12th July 2012, 12:44 PM   #5
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Assuming that they're designed for the same (low end) frequency response and power level, the 10K:16 Ohm would need twice the inductance - more primary and secondary turns on the same core. This would probably require dropping the wire size, so might end up with twice the DC resistance. Loss would be similar to the 5K:8 Ohm at rated impedance. High end would likely suffer due to double effect of higher winding capacitance and higher impedance source.
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Old 12th July 2012, 04:19 PM   #6
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It all depends on which tradeoffs the transformer maker chose to make. As the primary circuit impedance is increased there is a tradeoff of Lpri vs distributed capacitance. More turns are needed in general. It can go either way, to the high end or the low end or both. DC resistance will of course increase but if it's in proportion to the Zpri it's OK. The thing to look for in a high performance high Zpri OPT is more sectioning of the winding.
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Old 12th July 2012, 04:46 PM   #7
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Hello,

Edcor my know more than they are telling.

You are right being plexed. The impedance ratios are the same for both transformers.

From the data given they are the same.

DT
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Old 12th July 2012, 05:01 PM   #8
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Quote:
Originally Posted by DualTriode View Post
From the data given they are the same.
Can you back that up with data? They might be the same, note that the 10k:16 quotes a primary DCR and a primary inductance, while the 5K:8 does not. That is the data that would prove they are the same.
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Old 12th July 2012, 05:40 PM   #9
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Quote:
Originally Posted by leadbelly View Post
Can you back that up with data? They might be the same, note that the 10k:16 quotes a primary DCR and a primary inductance, while the 5K:8 does not. That is the data that would prove they are the same.
Let me try one more time.

You want me to provide data that is not provided by Edcor?
The stated input and output impedances indirectly tell us the turns ratio of the windings. They are the same for both transformers.

From the data provided we do not know how the transformers are built; or the AWG of the windings, primary inductance, blah, blah and blah.

There very well may be something Edcor is not telling in the provided data sheets.

DT
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Old 12th July 2012, 05:58 PM   #10
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Hmm well we could just contact Edcor by phone or email and ask them I suppose.
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