According to The Tube Store site (
http://www.thetubestore.com/Tubes/Mullard/Mullard-GZ37-CV378) a GZ37 (CV378) tube can be used in place of GZ34 & 5U4G rectifier tubes. Does anyone know how a GZ37 would affect sound quality when substituted for a GZ34? Dan Wright said this tube would work in his LS100 except it might be too tall for the enclosure.
Also, thank you to those responding to my Holy Grail question.
