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hagtech wrote:

Yes, it is an E55L.  I wonder how stable it is.  Interesting to me how many of these "uber-tubes" are designed for RF operation.  Should make a wonderful oscillator.

Go figure not stable are they. All those MHz tubes are very fast and defiantly need a good shock-observant mounting, rid stopper and elevation of anode over screen to minimize possible oscillation. How stable are they after that? I think it is a model by model, brand by brand and in many instances a tube by tube. The 7788 and particularly made by a good brand is very good from this perspective and from my view it has the best transconductance vs. noise ratio.

hagtech wrote:

The other find I came across was a pair of 6CL6.  Makes me want to design all kinds of new amplifiers.  The video amp schematic in the 6CL6 data sheet shows the exact series-shunt inductive peaking I used many years ago, but with transistors

Well, here were we are differents – I never have any desire to design/build “all kinds of new amplifiers”. I know many people do, it is what I call the Lynn Olson Syndrome – I do not suffer from it. I need juts one amps and one speaker and I do not found a pleasure to intermingle again and again and again with the amps and speaker. For the Olson-type of people the ceremony of intelligent BS on the subject is meaningful and self important. I am in contrary found that result is something then more motivates me. So for me that fact that there is another good tube out there or another good driver out there is not the solicitable factor. To me more important the specific problems that I recognize currently with sound and the specific direction where I would like to lead my Sound. To massage everything that is massageable, as Lynn Olson and many others do at his DIYaudio site is too tedious and ignite no interest to me. I am certainly not against the 6CL6 but it would be more useful to me if you say what is wrong with your sound NOW and how you feel the 6CL6 should change it. Well, you use 7788 with 1V of bias at line level input – I know what and why it should be wrong with your Sound now… :-)

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