The parts BOM I publish is a guide as to what is needed. Specific part number availability changes and honestly it would be a full time job to constantly monitor these lists over time to ensure they remain stocked parts. I also, I am sent at least 3-4 emails a day asking me to look up every part on someone's list to ensure they are ordering the right parts, again that would entail hours a day reviewing people's parts lists for them, not something I would enjoy doing nor am I going to do. Finally, you should check the BOM against the schematic to ensure I didn't make any mistakes! Can you tell I loath these BOMs?
On the caps and being safe, I have done videos on this subject and I don't intend to spend 1/2 of every video revisiting this info on every specific amp. It's why I have a warning at the start "Don't do this work if you haven't researched and understand safety!" If you don't understand how to apply safety protocols to this specific amp and have to be shown on this specific amp how to test for residual voltages etc, honestly you should NOT work on this amp or any other tube device until you can understand this stuff clearly.
On the A10 vs the A12, I don't have an A10, have never seen one in person nor am I going to go buy an A10 just to show the difference on camera. I've seen pictures and more importantly, I looked at the data sheets on the two different input tubes used and the only difference is how the heaters are wired. Below is a picture of the difference in the heater wiring. Again if you can't read a schematic or can't figure this out from the below info, you should NOT be working on any electronic gear until you do.
The last question always baffles me, I show on camera how to modify one channel of the amp. It's a stereo amp so of course there are two channels and I mistakenly assumed people would understand that you simply repeat the same mods to the other channel, pretty sure I actually say this on camera, and I didn't make a second video repeating this same process. Again, if you can't figure out how to repeat this mod to the other side of the amp, you need to learn more about reading a schematic and understanding that you connect this value resistor or wire from this point in the amp to this tube pin etc.
Sorry if this sounds harsh but this isn't like building a lego kit, it can be deadly and if you don't do it right it can destroy parts etc. Against I have made several instructional videos about safety, reading schematics and there are endless resources online to gain this knowledge.
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https://youtu.be/Ou33pF9aYbk
