@bugredmachine those are the socket savers I'm using. They fit tight and work fine in my Don Sachs linestage. It does look a little odd to have two tubes plugged in straight and the other tubes towering above them on stacked socket savers. The socket savers don't seem to affect sound quality much, if any. The Linlai with socket savers are competing easily with my best antique tubes. Glad you are having better luck.
Thanks,
aldnorab