Charles1dad,
You are right; your comment prompted me to remove the Micro ZOTL from another system and connect it to the Dynamo. Better than slight improvement. Very nice improvement. Like Lancelock stated, "heavens opened up, angels sang." I really can't explain why I though otherwise. Probably not listened to the Micro ZOTL with Dynamo in too long a time; still, the Dynamo is very good on its own. And yes, the Dynamo responds extremely well to tube rolling.
I should also mention that my Dynamo has upgraded caps and resistors /power supply based on suggestions by Yazaki-san, the designer/mod-maven from Jeff Day's blog.
Charles, you are favorite poster along with grannyring and some others, such as Almarg. Always respect your opinion and what you value in music. Best, mikirob