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Audio and Video Talk
Valves / Vacuum Tubes
EI VS C-Core for PP transformer question
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<blockquote data-quote="Ampdog" data-source="post: 600753" data-attributes="member: 144"><p>OT but a further practical hint, as this is not only about core theory:</p><p></p><p>Members might have picked up from references that core material is sensitive to mechanical stress; the higher the permeability (?) the more so; even high temperatures. Particularly when disassemling a core, removal of the first E/Is may be difficult. They are stuck and careful tapping out on the middle leg of an E will be needed. A thin blade squeezed in may be required. </p><p></p><p>This may need careful placing of a thin screw-driver tip or similar. One should not use great impact force (hammering) as it can change the molecular structure of core laminations. Also with re-assembly, 'hammering home' core parts is not recommended. One may have to discard an outer lamination which got damaged/warped in the process; one lamination fewer will not be a train-smash. On reassembly it is better to squeeze laminations back by a suitable vice or clamp. (Wooden blocks on the ends are recommended.) Care should be taken that skew laminations do not cut into coil former sides etc. - patience and precision required!! Finally squeezing the assembly tight at the end is good practice.</p><p></p><p><span style="font-size: 11px">Simply put: Do not do to the core what you will not do to your girl-friend.</span></p></blockquote><p></p>
[QUOTE="Ampdog, post: 600753, member: 144"] OT but a further practical hint, as this is not only about core theory: Members might have picked up from references that core material is sensitive to mechanical stress; the higher the permeability (?) the more so; even high temperatures. Particularly when disassemling a core, removal of the first E/Is may be difficult. They are stuck and careful tapping out on the middle leg of an E will be needed. A thin blade squeezed in may be required. This may need careful placing of a thin screw-driver tip or similar. One should not use great impact force (hammering) as it can change the molecular structure of core laminations. Also with re-assembly, 'hammering home' core parts is not recommended. One may have to discard an outer lamination which got damaged/warped in the process; one lamination fewer will not be a train-smash. On reassembly it is better to squeeze laminations back by a suitable vice or clamp. (Wooden blocks on the ends are recommended.) Care should be taken that skew laminations do not cut into coil former sides etc. - patience and precision required!! Finally squeezing the assembly tight at the end is good practice. [SIZE=11px]Simply put: Do not do to the core what you will not do to your girl-friend.[/SIZE] [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
EI VS C-Core for PP transformer question
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