Quote:
Originally Posted by x3workshop
If you can find some Ei KT90 tubes to try in your Pentode Inspire I highly recommend them. They have all the slam, air, subtlety, and nuance you could ever want. Amazing midrange quality.
I have rolled every tube type in mine and these are the best for my setup.
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Did a quick search, certainly not easy to find. eBay search has been set up, certainly sounds like it will be worth the hunt for the longterm.