Position of OPT windings - diyAudio
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Old 12th May 2014, 12:04 PM   #1
AllenB is offline AllenB  Australia
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Default Position of OPT windings

I have 6 primary windings, 3 secondaries, 1 cathode feedback and 1 DC bias offset. This is a single-ended OPT but the feedback and bias windings aren't balanced within the window so maybe I should have two, I'm not sure.

So far I've put B+ on the second layer moving outward with the extra windings splitting up the two double layer primary sections.
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Old 12th May 2014, 02:14 PM   #2
TheGimp is offline TheGimp  United States
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You do not show any interleaving. Do you plan to interleave the primary and secondary?
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Old 13th May 2014, 01:27 AM   #3
AllenB is offline AllenB  Australia
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Do you mean sectionalising side to side? No I wasn't planning to because every primary layer has been isolated from the next, and each has close access to the secondaries. Not sure whether this is enough.

The cathode feedback winding is close to ground and the DC winding will be.. (probably tied to B+), and high impedance (either V source with choke feed or CCS). So if I can drive those capacitances from the primary I hope this improves response over a multi-layer primary.

I hope there isn't an LL issue.
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Old 13th May 2014, 07:16 PM   #4
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Quote:
Originally Posted by TheGimp View Post
You do not show any interleaving. Do you plan to interleave the primary and secondary?
Look closer. Lots of interleaving. Black is primary etc.
Thorsten Larsen
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Old 14th May 2014, 12:19 AM   #5
AllenB is offline AllenB  Australia
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Is it OK for the cathode winding to be at less than full layer density given that it's in series with the plate winding?
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Old 14th May 2014, 03:48 PM   #6
TheGimp is offline TheGimp  United States
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I missread it since you have anode and B+ looking like they both go to one layer on the bottom as if it were all of the primary.
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