Marantz model2330B Part 1 diagnosis and preparing a list with parts

I start working on this amplifier because one channel have a problem. A strange humm present in one channel and unfortunately I need to split in 2 parts. So this part you will see how I do diagnosis and find the issue and in the second part we will start working on because I also made a list with all the parts that I will change inside of this amplifier I also launched a new youtube channel in collaboration with my sister and brother in law from Philippines, it's all about simple life and nice places around the Philippines island. If you would like to watch them videos please subscribe to this channel as well here is the link    / @lifeinthephilippinesisland9792   activate the notification bell as well to don't miss them videos if you like to relax watching nice places in Philippines and learn about the life on the Philippines islands If you are interested on which tools I use around my working bench here some useful links https://s.click.aliexpress.com/e/_opG... https://s.click.aliexpress.com/e/_oDG... https://s.click.aliexpress.com/e/_onm... https://s.click.aliexpress.com/e/_onC... https://s.click.aliexpress.com/e/_onx... https://s.click.aliexpress.com/e/_ooE... https://s.click.aliexpress.com/e/_opk... https://s.click.aliexpress.com/e/_ooh... https://s.click.aliexpress.com/e/_op6... https://s.click.aliexpress.com/e/_oC6... https://s.click.aliexpress.com/e/_oD3... https://s.click.aliexpress.com/e/_ooL... https://s.click.aliexpress.com/e/_oln... https://s.click.aliexpress.com/e/_oDs... https://s.click.aliexpress.com/e/_oo7... https://s.click.aliexpress.com/e/_ond... https://s.click.aliexpress.com/e/_oCH... https://s.click.aliexpress.com/e/_o2d... https://s.click.aliexpress.com/e/_oB2... https://s.click.aliexpress.com/e/_oDN... https://s.click.aliexpress.com/e/_olW... https://s.click.aliexpress.com/e/_opd... https://s.click.aliexpress.com/e/_opE... https://s.click.aliexpress.com/e/_oBz... https://s.click.aliexpress.com/e/_omX... https://s.click.aliexpress.com/e/_oCr... https://s.click.aliexpress.com/e/_oB3... https://s.click.aliexpress.com/e/_oF3... https://s.click.aliexpress.com/e/_olw... https://s.click.aliexpress.com/e/_onH... https://s.click.aliexpress.com/e/_olG... https://s.click.aliexpress.com/e/_onW... https://s.click.aliexpress.com/e/_okM... If you like my videos and my channel and you would like to support my work and projects any small donation to my Liberapay account would be appreciated! Here is the link to my Liberapay account https://liberapay.com/SymbolTech/ or any small donation on patreon would be appreciated! Here the link to my Patreon account   / symboltech   #audioamplifiers #hifi