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Old 30th January 2017, 06:27 PM   #1
Miasma is offline Miasma  United States
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Default Tubelab SSE 6ohm OT with 8ohm Speakers?

I just finished building a tubelab SSE. I am very pleased with the results, but my 6ohm speakers aren't quite sensitive enough (~88 dB/m) for my liking (I thought they would be).

What would be the ramifications of running 8ohm speakers (I've ordered frugelhorn3's with fostex fe126en2) on my OT which have a 6ohm secondary?

The OTs I am running are Edcor CXSE25-5K.

I know the reflected impedance would be 5K*8/6 = 6666 which is about 30% higher than recommended. As a result, I think I would see a bit lower distortion, but also a bit less output power?

Should I just suck it up and order a new pair of OTs?

Last edited by Miasma; 30th January 2017 at 06:50 PM.
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Old 30th January 2017, 06:50 PM   #2
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I built my SSE with a 5k:6ohm output specifically so that I wouldn't have to worry about 4 ohm or 8 ohm speaker loads. I think you should keep the outputs as is!
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Old 30th January 2017, 06:59 PM   #3
Miasma is offline Miasma  United States
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Originally Posted by Sodacose View Post
I built my SSE with a 5k:6ohm output specifically so that I wouldn't have to worry about 4 ohm or 8 ohm speaker loads. I think you should keep the outputs as is!
Thanks for the reply and encouragement!

I am hoping to get a better understanding of the ramifications of this choice in case I've misunderstood the issue.

I know that speakers are a dynamic load and that nominal impedance does not give a full picture of what the OT and power tubes see.

I'd really appreciate any further insights about what the sonic, OT and power tube impact would be.
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Old 3rd February 2017, 06:19 PM   #4
w5jag is offline w5jag  United States
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Quote:
I know the reflected impedance would be 5K*8/6 = 6666 which is about 30% higher than recommended. As a result, I think I would see a bit lower distortion, but also a bit less output power? .....
The transformation ratio is 625:1 (5000/8). Wouldn't this make 3750 ohms for a 6 ohm load?

Or have I got the arithmetic backwards?

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Old 3rd February 2017, 09:06 PM   #5
Miasma is offline Miasma  United States
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Originally Posted by w5jag View Post
The transformation ratio is 625:1 (5000/8). Wouldn't this make 3750 ohms for a 6 ohm load?

Or have I got the arithmetic backwards?
The transformer is 6ohm, load is 8ohm, so yes I think you have it flipped.
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