Bottlehead Forum

RE: Seduction output cap for a low impedance input

24.18.240.124

In Reply to: RE: Seduction output cap for a low impedance input posted by rickmcinnis@dogwoodfabrics.com on January 02, 2008 at 10:36:11

For a 10K resistive load, a 1uF cap will make a 20Hz corner frequency, which is sometimes implemented in phono stages to reduce rumble. A larger cap will push that frequency lower - preferable unless your turntable has a rumble problem... 2uF to 4uF would be a good range.

However, I would encourage you to ask the preamp maker since this is a transformer input. The Seduction output capacitor is essentially acting as a parafeed capacitor into a transformer load, so there is likely to be an optimal range of capacitances for that particular transformer.

A low-impedance load will reduce the Seduction output slightly (about 3dB for a 10K load) and increase the distortion - probably not enough to hear though, since the headroom is quite large. For these reasons I have recommended at least 33K load, with 15K being "acceptable" and 10K being "acceptable if the output capacitor is made larger".

Going below 10K is not recommended because the output stage will then current-limit before it hits a voltage limit. Such a condition would reduce output voltage and headroom quickly.

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