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Old 6th May 2011, 12:02 AM   #91
Jeb-D. is offline Jeb-D.  United States
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Out of curiousity I ran some more tests:
Simulated 300B drive (700R + 700R) = -3dB @ 28kHz
Simulated 6c33c drive (80R + 80R) = -3dB @ ~ 45kHz

The transformer has a resonance at 50kHz. The frequency response drops until 50kHz and then goes back up again. Changing the source impedance seems to be changing the Q. Lowering the source impedance raises the cutoff frequency, but it rolls off really steep and comes back up steep. Higher source impedance rolls off sooner, but it's more gradual and it comes back up gradual.

Looks like bass amp duty for this guy. It's a shame. The build quality is very good.
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Old 6th May 2011, 08:39 AM   #92
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I have found the same resonance behaviour when I have used mains toroidals.
Typically it is much reduced by reversing the polarity of the primary side windings.

Shoog
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Old 6th May 2011, 05:50 PM   #93
Jeb-D. is offline Jeb-D.  United States
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Quote:
I have found the same resonance behaviour when I have used mains toroidals.
Typically it is much reduced by reversing the polarity of the primary side windings.

Shoog
Unfortunatly, this transformer has a center tapped primary rather than dual primaries. And it is potted, so it is not possible to unwrap and split the CT.

The primary inductance is outrageous. I have a few other 5k transformers from reputable winders and the primary inductance's measure about 1/10th that of this Antek unit. The low end response is probably outstanding, but they could likely gain some top end performance by sacraficing some of the low end (Using far fewer windings, but maintinging the same ratio).
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Old 6th May 2011, 07:37 PM   #94
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Its a shame really as the only other alternative is Piltrons which are not cheap.

The original reference to using mains toroidals talked about similarly high Inductances.

Shoog
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