I recently got all the parts for a 12xxx series from valve storm and transformers from heyboer ( 1203-80-ML power , and c-1998, choke ) no problem wiring it up from the 67-68 Superlead layout but im stumped on some 1203-80-ml connection points. The 68-69 wiring layout shows to blue to standby that I get , a yellow ct , a yellow bias tap and a ground to chassis. my heyboer has a red yellow stripe that I take is the ct, and 2 red wires I understand are 178 v (im not using the152v taps). question is where is the ground? what red wires where ? Can someone help me figure this out please as no one seem to want to let me in on this ... heyboer says ask valvestorm .. valvestorrm wont tell.. I hoping someone kindly knowledgeable on these 67 - 68 Marshalls can Help? thanks.