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Old 18th August 2010, 05:32 AM   #1
Divad89 is offline Divad89  Denmark
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Default OPT vs tubes

With the Simple SE does the PT and OPTs have to turn a certain way in relation to the tubes?

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Old 18th August 2010, 03:43 PM   #2
rknize is offline rknize  United States
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No, but it is good to have the PT rotated 90 degrees and positioned in-line with respect to the OPTs. This minimizes magnetic coupling into the OPTs from the PT. The PT (even a good one) tends to leak flux due to transients from diode switching, etc.
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Old 18th August 2010, 04:14 PM   #3
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by rknize View Post
No, but it is good to have the PT rotated 90 degrees and positioned in-line with respect to the OPTs. .......
I suppose that menas OPT iron facing towards PT

But then OPT might radiate towards supply trafo instead, or maybe input
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Old 18th August 2010, 05:34 PM   #4
rknize is offline rknize  United States
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You don't need to worry about leakage flux from the OPT unless the OPTs are really undersized and will be driven well into saturation. Even then, distortion will be so bad due to the oversaturation that whatever leakage there may be will not even be a factor.

The thing to worry about is the PT. It is often driving into saturation due to the switching currents and so forth. Keep the PT as far away from everything else as you can, especially the OPTs and any input signal wiring.
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Old 18th August 2010, 09:40 PM   #5
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My SSE is as silent and hum-less as a tube amp can be. The image shows a good separation of the PT (left side of PCB) and the OPT's (right side of the PCB). If you have this much room in your chassis, a layout like this will help mitigate EMF issues.
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