Feedback received via email from Darren in Australia:

“Hello Rachel,

I just wanted to let you know the (KT88-Z, CV181-Z and 6SL7-Z) arrived yesterday.

I fitted the CV181-Z and 6SL7-Z first and listened to a significantly improved openness …

I should have done more  listening to get a better appreciation of the difference, but could not wait to add in the KT88 treasures

Again the sound was improved – less bass slam – tighter

I look forward to a longer burn in period to get the full appreciation, but first impression is that they are very nice.”