Elrog 300b vs we300b

Can the tube experts and aficionados comment? Might be relevant...

From a thread resurrected by @mozartfan circa 2003 and posted by @clueless 

"My limited experience so far is that drivers actually contribute a stronger sonic signature than the output tubes, which are pretty transparent if driven by a low enough source impedance and low distortion.  Arthur Loesch tracked me down at the CES a few years ago, and as we chatted and toured the rooms at the Alexis Park, he mentioned that most DHT's sound alike - if driven by a low enough source impedance and a powerful driver with *lots* of current. It's when they are driven by feeble 5-8mA driver tubes that the characteristic 45, 2A3, 300B, or 845 signature appears. In other words, you'll get loads of that 300B sound if all you're using is an RC-coupled 6SN7."
-  end quote Lynn Olson

@sns   Thanks for your response. Can you address this more specifically...as in:

- would choice of driver tube by the designer/builder of a 2A3 amp (for example purposes only...feel free to substitute for another power tube) contribute to differences in the same (or more; or less) league as do different 2A3 tube choices?  Thanks, - David.

I've heard this claim a number of times, not my experience, various driver tubes in two 845SET, one 2a3 and 300B, I've always heard difference between output tubes, easy to hear.

@sns Thanks for your responses. Looking forward to your findings when comparing the Acme and Shugang in your 845 amp.

@charles1dad Thanks. I’ll reach out to Scott to find out his thoughts on his choice of driver tubes (7A4 x2 with OC3 x2 and OD3 assisting) for my 2A3 amps and what he thinks of Loesch’s points.