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Paul,

The idea of the not threaded forum is good that it is always there is opportunity to go back to all there and update own views, or to extend them. In many moths/years when the ML2 stop be a novelty for you, you might return to this thered and fine my following post worth consideration.

So, I went today to The AA Sewers ™ and have seen you were bitching about the Lamm charging $300 for a pair of the marched 6C33C and about the price of the 6N6P. Certainly I do not question the Vladimir’s right to make money on the intimidation and misapprehending the operation need for his products. After all, the Volkswagen use to sell their cars very cheap, practically at the cost, and made quite lot of money selling the services…

Anyhow with all my quite2xtended experience with Lamm ML2 there was one experiment that I never conducted and I am sorry now that I did not as it might be very interesting.

The ML2 second stage use a Russian made dual triode 6N6P. It is very critical tube in the ML2 circuit and it is hugely responsible for the sound of this SET. (BTW, change this tube one a year). The 6N6P is very good tube, one of the very few Russian tubes that actually sound very refined… but it is Russian tube… if you know what I mean… It would be VERY interesting to use in ML2’s second stage the best of the Western equivalents. Russians ripped up their 6N6P from Western 5687 (don’t ask me why but Russians very seldom designed own tubes but mostly juts mimicked western tubes). The 5687 is very well know and it is also VERY-VERY superb tube, widely used in many designs. The specifications are nothing dramatic but it has a very serious driver sound, is anything else as important? The 5687 has slightly less gain but all together it might be used in place of 6N6P without any change of operation point. It has different pins layout but it very simple to make a non-complicated tube socket adapter to cross-map the 6N6P and 5687. Sure a good version of 5687 might cost $6 or $25 but the 6N6P you can get for $1-$2, but I still, despite the economic advantages of 6N6P would try the Western tube. At least a dozen companies made 5687: Tung-Sol, Sylvania, Philips, General Electric, Amperex, Ratheon, RCA …etc… and it is suitable to be drop replaced by 6900, 7044, 7119, E182CC) instead of the 5687 (also I do not know how they sound).

Anyhow, I would generally do not proposed such experiments but if I have a change to putt the marvelous 5687 into the game then I would defiantly try it. As I said I am sorry that I did not do it when I used ML2. I still do not feel that 5687 will be able to address the sonic kisses I had with ML2 but… who knows… A driver is very critical part of any SET….

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