I opened up my 1980 Deluxe Reverb tonight, in order to troubleshoot the trem intensity (you don't start hearing anything until the intensity is at about 5. It's not a huge deal, I just wanted to see if I could do anything with it). While I was in there, I noticed this- It's a 200 ohm resistor (Clarostat VC5E 200), about 5 watts if my research is correct. It's on the B+ line between pin 8 of the rectifier and the circuit board. It's not on any of the AB763 schematics I've seen. Any idea what it's for?