I came across this interesting capacitor shootout:
http://www.tempoelectric.com/caps.htm
V-cap was named 'best in class'. With the popularity of V-caps, it seems that it will be a popular upgrade for Spectron amps.
When I send my amps for the MK II upgrade, the V-caps option will be at the top of my list.
What are your thoughts on the V-cap upgrade?