Agree with Onhwy61. If you're audiophile and perfectionist obsessed with quality of interconnects, forget about vintage stuff -- they won't match it and OP already heard it from more than one contributor...
Recommendation to use angled adapters is TOTALLY outside of audiophile concept and purity. What's the point to add an extra ANGLED connection?? Dood, you'll come back to the quality of $3 Walmart or Trisonic cable even with yer Monstor interconnects or Transparent or Schmonster, because connection quality is substantially more critical than quality of wire. In blind A/B you'll guess 50% wrong or more percentage towards $3 Walmart. In both cases you again and again come back to $3 Trisonic or Walmart cable.
Recommendation to use angled adapters is TOTALLY outside of audiophile concept and purity. What's the point to add an extra ANGLED connection?? Dood, you'll come back to the quality of $3 Walmart or Trisonic cable even with yer Monstor interconnects or Transparent or Schmonster, because connection quality is substantially more critical than quality of wire. In blind A/B you'll guess 50% wrong or more percentage towards $3 Walmart. In both cases you again and again come back to $3 Trisonic or Walmart cable.