To get the glow looks from tube with 200 ISO film will take much longer than 5 secs.
If you want to take pic of the whole amp and see the glow too... You have to set your camera on tripod. In a room with very low or no light at all. If you want easy one, you could use your camera flash for this to get first initial exposure for the surround (the amp itself) With 200 ISO film set camera on Manual mode; if you taking pic with most of the amp in it than set f. stop at about f. 8 or 11 for start. Than set the shutter speed first at 15 sec. Second shot at 30 sec and third shot at 1 min. If not sure do another one at 1:30 min. This is call bracket.
One of this shot will have good glow with correct initial flash exposure.
Have fun
Buddy
NYC
