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Audio and Video Talk
Valves / Vacuum Tubes
Small Valve amps vs Big Valves amps
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<blockquote data-quote="jerkyaudio" data-source="post: 1170604" data-attributes="member: 15181"><p>The bypassing of caps can cause some ringing and parasitic oscillations. The issue here is that this amplifier was properly designed to offer a proper match to the power transformer in the sense of a properly tuned circuit. The (sometimes mostly often bad) idea of bypassing is to reduce the impedance of the the capacitor but in most circumstances the very bright Japanese engineers used this higher insertion loss to their advantage. So I made no such mistake and yes I did bypass the caps but found higher quality lower ESR discrete capacitors did restore the pristine sound without ruining its character. </p><p></p><p>The thing is in any amplifier the signal actually passes through the power supply - so messing with these values also messes with the feedback, and hence the transfer function, and then the amplifier no longer is what the much smarter than me designers had in mind.</p><p></p><p>Of course digital circuits where RFI etc needs to be handled does justify bypass but with the correct dielectric devices.</p><p></p><p>The mind boggles...</p></blockquote><p></p>
[QUOTE="jerkyaudio, post: 1170604, member: 15181"] The bypassing of caps can cause some ringing and parasitic oscillations. The issue here is that this amplifier was properly designed to offer a proper match to the power transformer in the sense of a properly tuned circuit. The (sometimes mostly often bad) idea of bypassing is to reduce the impedance of the the capacitor but in most circumstances the very bright Japanese engineers used this higher insertion loss to their advantage. So I made no such mistake and yes I did bypass the caps but found higher quality lower ESR discrete capacitors did restore the pristine sound without ruining its character. The thing is in any amplifier the signal actually passes through the power supply - so messing with these values also messes with the feedback, and hence the transfer function, and then the amplifier no longer is what the much smarter than me designers had in mind. Of course digital circuits where RFI etc needs to be handled does justify bypass but with the correct dielectric devices. The mind boggles... [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Small Valve amps vs Big Valves amps
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