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Audio and Video Talk
Valves / Vacuum Tubes
Having tube preamp Transformer wound questions
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<blockquote data-quote="Family_Dog" data-source="post: 946241" data-attributes="member: 82"><p>Primary winding: 0 - 220v - 250v</p><p></p><p>Secondary: 2 x 3.15 - 0 - 3.15v windings, say at 3A each. These can be run for powering the normal 12A*7 valves in either 6v or 12v mode.</p><p></p><p>High Voltage Secondary: 250 - 0 - 250v at 150-200mA should suffice for most purposes, if you intend building an EL84-based Stereo amplifier in push-pull mode with a single power supply, use 300 - 0 -300v at 200mA and perhaps increase the low-voltage 6v windings to 4A rating.</p><p></p><p>I would suggest companies like SJ Andrews and also Peter Souris in JHB for manufacturing transformers. Specify leads that are long enough, say about 200mm leads, and I would use a normal EI-type lamination with shrouds on either side, vertical-mount.</p><p></p><p>Ignore the voltages in the pic, but that is more or less the shape of transformer I favour:</p><p></p><p><img src="https://image.made-in-china.com/202f0j00EZBtAhlsbYpo/50Hz-Ei-Laminated-Transformer-Power-Supply-with-IEC-Certificates.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p></p><p>-F_D</p></blockquote><p></p>
[QUOTE="Family_Dog, post: 946241, member: 82"] Primary winding: 0 - 220v - 250v Secondary: 2 x 3.15 - 0 - 3.15v windings, say at 3A each. These can be run for powering the normal 12A*7 valves in either 6v or 12v mode. High Voltage Secondary: 250 - 0 - 250v at 150-200mA should suffice for most purposes, if you intend building an EL84-based Stereo amplifier in push-pull mode with a single power supply, use 300 - 0 -300v at 200mA and perhaps increase the low-voltage 6v windings to 4A rating. I would suggest companies like SJ Andrews and also Peter Souris in JHB for manufacturing transformers. Specify leads that are long enough, say about 200mm leads, and I would use a normal EI-type lamination with shrouds on either side, vertical-mount. Ignore the voltages in the pic, but that is more or less the shape of transformer I favour: [IMG]https://image.made-in-china.com/202f0j00EZBtAhlsbYpo/50Hz-Ei-Laminated-Transformer-Power-Supply-with-IEC-Certificates.jpg[/IMG] -F_D [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Having tube preamp Transformer wound questions
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