Well, the amp socket is very stout ceramic. Nothing should happen to that.
It is much, much easier to remove a tube with the extender, but in a way I hadn't imagined.
I thought the extender would stay put but the tube would be easier to grasp and rock out of the extender.
Wrong. The tube doesn't move when grasping it and rocking. Only the extender rocking off the PCB tube socket.
Due to the leverage the rocking is controlled and gentle.
When you have the tube coupled to the extender in your hand it's a snap to remove the tube with very little force. It's more pulling it straight off than rocking.
Perhaps that's up and down is better than rocking side to side. No matter there is significantly less strain put on the tube pins. It's also much faster.
To install the new tube I snap the extender on the tube and lower the assembly into the case and into the socket. It's easier to guide the assembly into the Lyr
because it's easier to grasp.
Heat. The tube certainly has more circulating air and there is less heat radiated inside the Lry. The volume knob is significantly cooler.
The tubes are raised 3/4" and the diameter of the extender easily fits through the tube access holes on the top of the Lyr.
This setup might not work well with kids and cats and IMO does not look as nice as the stock Lyr.
I purchased the extenders from Brent Jessee Recording. He's a very well respected tube source and resource.
http://audiotubes.com/books.htm