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DIY For Audio
Musical Fidelity F15 repair "nightmare"
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<blockquote data-quote="JimGore" data-source="post: 1028933" data-attributes="member: 3"><p>Thanks very much everyone :dop:</p><p></p><p></p><p>I have a PC speaker build planned for December if I have some free time. I will share here when I get to building it. I haven't built anything for quite a while so the itch to make some sawdust is strong! I may build 2 or 3 different sets simply because I can't quite decide on what to build - it just depends on how energetic I feel when the time comes...</p><p></p><p>---</p><p></p><p>Ok, the additional information helps paint a clearer picture. Check my understanding:</p><p>* DC Offset is around 2 - 3V, and after about 30 seconds when the relay closes, then the offset fluctuates between V- and +26V.</p><p></p><p>So, does the amplifier have a valve pre inside it, or is the valve in a separate stand-alone pre-amplifier?</p><p></p><p></p><p></p><p>The weird thing here is the fluctuation. Dead transistors don't normally do that from what I have seen, so this makes me think it's something else causing it. Maybe a dry joint of sorts, or something not soldered in well?</p><p></p><p>What happens when then amplifier input is grounded (shorted to ground)? Offset still running around, or does it settle at some value?</p><p></p><p>Cheers,</p><p>Ian.</p></blockquote><p></p>
[QUOTE="JimGore, post: 1028933, member: 3"] Thanks very much everyone :dop: I have a PC speaker build planned for December if I have some free time. I will share here when I get to building it. I haven't built anything for quite a while so the itch to make some sawdust is strong! I may build 2 or 3 different sets simply because I can't quite decide on what to build - it just depends on how energetic I feel when the time comes... --- Ok, the additional information helps paint a clearer picture. Check my understanding: * DC Offset is around 2 - 3V, and after about 30 seconds when the relay closes, then the offset fluctuates between V- and +26V. So, does the amplifier have a valve pre inside it, or is the valve in a separate stand-alone pre-amplifier? The weird thing here is the fluctuation. Dead transistors don't normally do that from what I have seen, so this makes me think it's something else causing it. Maybe a dry joint of sorts, or something not soldered in well? What happens when then amplifier input is grounded (shorted to ground)? Offset still running around, or does it settle at some value? Cheers, Ian. [/QUOTE]
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DIY & Tutorials
DIY For Audio
Musical Fidelity F15 repair "nightmare"
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