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KM,

Very good points. There is one more moment that I would like to pay attention. The new prediction tubes are more powerful then vintage tubes. They all claim 1 extra watt because “better materials were used”. So, I wonder, if it would be possible that in some cases Adrian’s old tube run out of power as Adrian did mention bass deficiency. Also, the new tubes might have less grid current and as soon the 2A3 runs out of negative grid voltage and grid current begin to rise then the old tube might need more powerful driver.

So, without a demeaning the results of Adrian’s finding I would propose that his observations are good as they are but if we would demand a definitive comparing then more methodologically kosher environment  shell be used. I would say that to be on a save site it need to be sure that both old and new tubes are used in the equal way. I think two measurements are necessary. First one, is to show how a given tube battles A2 class or how linear it is with positive voltage on grid. Let agree the for 3W tube it matters. Second, I would like to make sure that each tube individually set it the right operation point. I would like to drive a full power over the tube and to see that currant and voltage would clip at the same time. Ok, now it the interesting moment – what to do it they are not the same. To change operation point? To change loading? All of it affects Sound it and the question would be: what is the sound of tube vs. what the sound of the given operation?

I have to note that the Adrian’s comment about the saturation of colors most likely are the not the properties of operation but the properties of the tubes themselves. We do not know for how long but it is what it is. Still my general views on audio suggest me that comparing of tube is necessary to do only in context of the whole framework and in context of the specific intentions of reproduction. Let say for instance that Adrian has a park of all drivers out there and he reports that Silvania 2A3 with one specific driver sounds identically to the Emission Labs with another driver under identical clipping and A2 conditions. I think it would be a useful and indicative illustration. Unfortunately not one does it, .... and frankly speaking…. no one need it… the live is too short to waste it to those things…

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