Get the modern day equivalent: The 6505 here: http://amzn.to/1LZZXfl
Checking out if the 5150 bias mod is worth it... by comparing a stock 5150 to a modded one! Many thanks to Pixxy Lixxx for appearing in this! I've looked around & haven't really been able to find a decent shootout video on the subject. Does the mod really sound better? You be the judge!