Originally Posted by
Robert
"To test this for yourself, start with the tube shields off. That way you won't be dealing with hot tube shields later in this test. Warm up the amp and play, listening to the tone with a critical ear. Next put the tube shields back on. Be careful, the tube shields will be cool but the tubes will be hot. Do not change any settings on the amp or guitar and listen to the tone again. I rest my case. If your amp makes too much noise or does any nasty tricks with the tube shields off, do put them back on."