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DIY For Audio
Musical Fidelity F15 repair "nightmare"
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<blockquote data-quote="JimGore" data-source="post: 1028939" data-attributes="member: 3"><p>Hmmm... that makes it more difficult for me to fault find as my knowledge of valves is very close to 0. Perhaps 0.1 but not much more than that.</p><p></p><p>What we need to do is isolate where the offset is being generated. My inclination is that it is most likely being generated by the "pre" stage. Is it possible to check the offset directly after the "pre" stage? See if you can measure the DC voltage between the two wires as I have indicated here. </p><p>EDIT TO CLARIFY: Measure between the WHITE and SILVER wire of the COAX cable shown in the circle. Do this for the one channel, then also for the other channel.</p><p></p><p>Measure both the working channel and also the non working channel and let's see if there is any significant difference:</p><p></p><p><img src="https://lh3.googleusercontent.com/pw/ACtC-3cka9NRl1QiJIhJ5aHr5PEsQsuot8f0XHy2kytykUHwwvZSaw5Byrss9mqHnfk4-hOLzdIYN_mqn7MVdPByolll3IdRgf2MiSXxLudqn3t7ygKbG4Mqf-vgaGN92ElTZ0oS2WlBpuz4W7uq4F2Y6DIz=w1078-h810-no" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="JimGore, post: 1028939, member: 3"] Hmmm... that makes it more difficult for me to fault find as my knowledge of valves is very close to 0. Perhaps 0.1 but not much more than that. What we need to do is isolate where the offset is being generated. My inclination is that it is most likely being generated by the "pre" stage. Is it possible to check the offset directly after the "pre" stage? See if you can measure the DC voltage between the two wires as I have indicated here. EDIT TO CLARIFY: Measure between the WHITE and SILVER wire of the COAX cable shown in the circle. Do this for the one channel, then also for the other channel. Measure both the working channel and also the non working channel and let's see if there is any significant difference: [IMG]https://lh3.googleusercontent.com/pw/ACtC-3cka9NRl1QiJIhJ5aHr5PEsQsuot8f0XHy2kytykUHwwvZSaw5Byrss9mqHnfk4-hOLzdIYN_mqn7MVdPByolll3IdRgf2MiSXxLudqn3t7ygKbG4Mqf-vgaGN92ElTZ0oS2WlBpuz4W7uq4F2Y6DIz=w1078-h810-no[/IMG] [/QUOTE]
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DIY & Tutorials
DIY For Audio
Musical Fidelity F15 repair "nightmare"
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