Bugera 1990 vs JCM 900 Circuit Analysis

I got in a Bugera 1990 to try out, I compare the it's schematic to that of the Marshall JCM 900 Dual Reverb to spot the differences. 0:00 - Who Clones the 900 ? 3:40 - The Front Panel 4:43 - Switching & The Reverb Switching Quirk 5:46 - Looking Inside 6:43 - Infinium Function Explained 8:21 - Closer Look at the Boards 8:52 - Comments of Reverb 9:35 - Circuit Analysis , Starting w/ Lead 12:31 - Lead PreEQ Circuit & Signal Recovery 15:36 - Cathode Follower has Local Feedback ? 16:41 - The Random Tube Buffer 17:23 - Rough Explanation of Cathode Bypass 19:35 - Op Amp Buffered Master Volumes 19:54 - Marshalls Op Amp Switching 22:06 - Marshalls Op Amp Equivalents ? 23:00 - Clean Channel 23:12 - Rough Explanation of Op Amp Feedback 24:48 - Op Amp Feedback Clipping 27:42 - Power Amp Feedback & Depth ? 29:28 - Filament & Power Supply 30:47 - Closing Ramble