Fidele Audio
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Fidele Audio
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Quad 34 SE Upgrade - Full Details. All operational amplifiers are replaced with Burr Brown OPA227 or OPA2227 (Dual Amps). These are far superior to the original Op Amps giving a much more neutral sound and far lower distortion. All bilateral switch ICs are replaced. These are electronic switches used to transfer the selected input signal to the main pre-amplifier circuits and also to select filter levels. The originals are cheap ICs with a very high distortion rate. The replacements are the best I can find and have a very low 'On' resistance and a distortion rating of 0.008%. (Some of the cheap modern ones have a distortion of 0.1%). All signal path electrolytic capacitors are replaced with non-polarised capacitors. The phono input module signal path capacitors are replaced with non-polarised capacitors and all resistors are replaced with very low noise types. The phono input load capacitors are replaced with polystyrene capacitors at a value of your choice to match your cartridge. Please consult you cartridge instructions and specify an input load capacitor of 220pF, 560pF or 22nF as required. Further RF de-coupling capacitors are added in parallel to the zenor diodes in the module power supply on the main board. All power supply electrolytic capacitors are replaced and further RF de-coupling is added to all power supply lines. |
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