> tell me how to post photos
Take pictures. Save to your PC. Remember where you put them.
Go to http://tinypic.com/
Browse to where you saved the file on your PC and select the file, note the warning about naked or offensive pictures, and "Host Picture". When it goes through, they tell you the URL of your picture- be SURE to make a note!!!
One big limit: any image over 250KB will be re-sized. You can do a lot in 250KB, but sometimes you need more to capture the fine texture of a well-turned ankle.... er, a well-wired amplifier.
At http://www.groupdiy.twin-x.com/ there is an image-server donated for the use of this forum's members. File size can be large. But you have to Register (free) and then create an Album, upload, and then the URL to point AT your file is tricky to find.
If you have image manipulation software, it is polite to crop-out the crap around the object of interest, tune the contrast, and consider the size and compression level. A raw camera image can sometimes be compressed a lot without apparent loss, but jaggy images are hard to read.
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> apart from differences in the grid winding.
Ah, but the grid winding is often the toughest part of the tube.