eedork
Super Member
I'm finally getting around to recapping the AU-505 my uncle gave me a few years ago. It is in absolutely incredible condition, and I can't wait to hear how it sounds after the recap.
So far I've replaced all of the problematic 2SC871 transistors with new KSA1845s. I've also replaced the mica insulators and grease on the outputs with new high quality sil-pads. Elna Simic IIs are on the way for all electrolytics minus the main filter cap and the two output caps, and that's what my questions relate to:
1. The main filter is 2200uF / 63V / 35mm diameter; should I bump this up? I know many do just because it is easy and cheap, but I'm worried about the initial surge current and switch contacts if I go much higher than what was originally spec'ed. Fortunately Mouser has a large selection of 35mm replacements, although the 2200uF / 63V replacement is only 20mm high (hah!! just barely larger than the clamp itself).
2. The output caps are 1500uF / 63V / 35mm. Should these be bumped up? I believe that increasing the capacitance here lowers the low frequency cutoff point of the amp, which I don't think is a big deal in this particular case.
Thanks!
-Matt
So far I've replaced all of the problematic 2SC871 transistors with new KSA1845s. I've also replaced the mica insulators and grease on the outputs with new high quality sil-pads. Elna Simic IIs are on the way for all electrolytics minus the main filter cap and the two output caps, and that's what my questions relate to:
1. The main filter is 2200uF / 63V / 35mm diameter; should I bump this up? I know many do just because it is easy and cheap, but I'm worried about the initial surge current and switch contacts if I go much higher than what was originally spec'ed. Fortunately Mouser has a large selection of 35mm replacements, although the 2200uF / 63V replacement is only 20mm high (hah!! just barely larger than the clamp itself).
2. The output caps are 1500uF / 63V / 35mm. Should these be bumped up? I believe that increasing the capacitance here lowers the low frequency cutoff point of the amp, which I don't think is a big deal in this particular case.
Thanks!
-Matt
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