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I still use my Dodd Pre-amp. I haven't found anything better yet. The naked Visha resistors took it up a notch and so did the use of the Jupiter caps in the coupling position. The sound can be varied quite a bit with the coupling caps. Also, not all batteries are the same. The bigger 100 amp hour Power Sonic batteries are my favorite. The bigger batteries really improve dynamics. The Russian DR tube was a must as well.
Part of the research I found was you recommending the 100AH batteries. Would still like to try one down the line. The Astron was cheap enough to start with. If things go well I’ll definitely love doing upgrades over time.