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Old 27th June 2015
  #1
Here for the gear
 

Anyone seen this input circuit before? (Panasonic/Ramsa WR-500)

Hi, so I got this thing on a whim, because I think it looks cool, built into a little suitcase. I've seen Ramsa schematics before and they are all pretty much the same, but this one is a bit different, so i thought I'd share and ask if anyone (Jim W, Matt S, et al) if there is any merit to swapping the 4 transistors on the input (2SC2557TU) for something new. I'm already going to put in some LME49720 for the 4560, but I can't find any datasheet on the transistors, so I figured maybe someone here would know.

Thanks!
Attached Thumbnails
Anyone seen this input circuit before? (Panasonic/Ramsa WR-500)-wr500input.jpg