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Vinnie,Did you experiment with changing out the diodes for Hexfreds or other ultrafast soft-recovery types?I replaced the 8 diodes near the top of the unit with MUR-860's. I'm guessing that these are the bridges for the power supply, but I didn't take the whole thing apart to trace out the circuit (no time to do that, really). I didn't see any other big diode bridges, though. The original diodes in this position were 2A02, which are 100v 2A diodes. I don't think they're of the ultrafast or soft- ...
Vinnie, Vinnie, Vinnie,You totally missed the "hum" part of this post back on pages 11&12. Someone had hum when using the "aux", I suggested a 3-prong to 2-prong adapter, problem solved.How could you have missed that?! ...
Hi TIC,Doh! I just read it! I must have been too wrapped up on my own circle The hum is the result of a ground loop. The ground prong (third prong) is internally attached to ground of the Sharp. When connected to certain other devices via the AUX port, the outer (ground) part of the RCA jack ties to the other device's ground, and the loop is formed. The 3 to 2 prong adapter breaks this loop.Anyway, looks like this is old news and I've been living in a Red Wine bubble! Thanks,
But, another fix is to drop the amps ground like you suggested. I've been doing this in various setups for years, but I've always wondered how safe it is. Do you have any perspective on that -- you seem pretty comfortable with it and you definitely know the innards of the Sharp well.