Ok.I see that many companies like Audio Research,BAT,Cary et la. are touting the 6H30 tube over 6922.What makes it different?What were the difficiencies of 6922?If it it is a better do you need a different circut design to use or can you swap?BAT VK5SE is touted as being a reasonably priced way to get this tube.Any others if it is indeed a holy grail?
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