ENGL Artist Series Bias & Thoughts on Tube Life

After a long winded rant about tube life, I rebias this ENGL artist series amp for a fresh set of JJ E34L's. 0:00 - It was just suppose to be a retube 0:55 - Long Winded Thoughts on Tube Life 1:48 - I don't use Stand By 2:16 - Vibration Damage & Microphonic Tone 4:04 - Assuming my way into the Head 5:27 - Looking Inside 7:11 - Transformer Ground Isolation 9:23 - Location the Cathode to Test 10:41 - Cathode Interception Testing 11:17 - Microphone Probing 12:12 - Checking the Working Voltage 13:14 - Bias Math 14:28 - Bias Adjust Location 14:36 - Check the Balance of the Old Tubes 19:02 - Playtesting the Old Tubes 21:01 - Swapping the Tubes 21:33 - Biasing the New Tube Bias 24:04 - Play Testing the New Tube 25:02 - Trying a Cooler Bias 27:10 - Microphonic Probing 27:30 - New vs Old Taste Test Opinions