I've tried Electro Harmonix Gold Pins, Tung Sols, some vintage GE and Sylvanias. Currently have a pair of PSVane T-II in the gain portion.While we're at it… Has anyone a favorite 6SN7 (or compatible) for their Freya? Apart from the semi-ubiquitous Russian Tung-Sol 6SN7GTBs and the JJ 6SN7s, I mean?
While the Sylvanias are very punchy and sound pretty good, the ones I have are microphonic, which is unfortunate.
BTW, there's a whole thread devoted to 6SN7s here: https://www.head-fi.org/threads/the-reference-6sn7-thread.117677/