playittwice
Super Member
As stated earlier, beautiful job and awesome write-up. It’s awe-inspiring and gives much motivation to re-store these fine pieces of vintage gear.
Thanks.
Thanks.
Nice, great to see you solved this. I had a 6500 and after replacing all caps and some electros with poly types, and even after putting in some newer low-noise transistors, I still couldnt address this in my unit.There was also a noticeable reduction in the background white noise/hiss
...Question: When I do 555/505's I replace all the transistors on the amp board not just if it has the UFO's-it lowers the noise floor. When I do this I need to up the bias trimmer to 2K ohm. So the 850 Ohm would not be a match for me, can't see if you replaced all your transistors from the pic?
Interestingly, the owner of one of the 555A that I had restored and upgraded was able to compare its phono stage to the recapped (but with capacitors that matched the stock values) phono stage of a second 555A that he owned, as well as to his Schiit Mani stand alone phono stage (http://www.schiit.com/products/mani). In this shootout, the restored/upgraded 555A phono stage was the winner: much better than the stock values recapped version and slightly better than the Schiit Mani.Nice! I've always found efforts to improve RIAA curves pay off in SQ if you listen to those flat licorice pizza thingies.