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Audio and Video Talk
Valves / Vacuum Tubes
Having tube preamp Transformer wound questions
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<blockquote data-quote="fredeb" data-source="post: 946232" data-attributes="member: 13623"><p>What tips can ye wise ones give us to have a tube preamp transformer wound locally ? I know next to nothing about transformer winding and don't know what would make a superb tube pre transformer that allows room for experimentation .</p><p></p><p>1. Option of making it pre with phonostage , capable of handling up to 6x 9-pin double triodes ( won't necessarily be 6 , but just in case )</p><p>2. Should the transformer have 6,3V and 12,6V taps , or can tubes with 12,6 filaments just be wired in parallel with 6.3V ? Or would it be better to have them wired in series with 12.6V ? Both ? More taps ?</p><p>3. Should one make the HT voltages centre-tapped to allow option of Tube or solid-state rectification ?</p><p>4. Can one easily have different HT taps to allow for different operating points ? eg. 150-120-100-0-100-120-150 </p><p>5. What current for HT to allow sufficient headroom for playing with different circuits ? 200mA ?</p><p>6. What is potting ? Dip the entire transformer in transformer varnish and stick it in a vacuum chamber to suck all the air out from between the windings , and the varnish into those gaps ?</p><p>7. Does one laminate between wound layers , or is that just for output transformers ?</p><p></p><p>Please help designing a tube pre transformer that will be good for DIY'ers to experiment with .</p></blockquote><p></p>
[QUOTE="fredeb, post: 946232, member: 13623"] What tips can ye wise ones give us to have a tube preamp transformer wound locally ? I know next to nothing about transformer winding and don't know what would make a superb tube pre transformer that allows room for experimentation . 1. Option of making it pre with phonostage , capable of handling up to 6x 9-pin double triodes ( won't necessarily be 6 , but just in case ) 2. Should the transformer have 6,3V and 12,6V taps , or can tubes with 12,6 filaments just be wired in parallel with 6.3V ? Or would it be better to have them wired in series with 12.6V ? Both ? More taps ? 3. Should one make the HT voltages centre-tapped to allow option of Tube or solid-state rectification ? 4. Can one easily have different HT taps to allow for different operating points ? eg. 150-120-100-0-100-120-150 5. What current for HT to allow sufficient headroom for playing with different circuits ? 200mA ? 6. What is potting ? Dip the entire transformer in transformer varnish and stick it in a vacuum chamber to suck all the air out from between the windings , and the varnish into those gaps ? 7. Does one laminate between wound layers , or is that just for output transformers ? Please help designing a tube pre transformer that will be good for DIY'ers to experiment with . [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Having tube preamp Transformer wound questions
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