Hi Mikirob,
I always have appreciated your listening impressions and insight. It seems we listen to music in the same manner and with very similar priorities. I'm not at all surprised that the Dynamo responds so noticeably to tube rolling. The very good amplifiers always seem to do so.
I am surprised that you say the LTA preamp offers only "slightly" better improvement vs the Dynamo's volume control. I guess I assumed a wider performance gap between them. It appears that the Dynamo is especially good for a 1500.00 amplifier.
If you ever hear the Double Impacts I'd love to know your opinion of them.
Charles