Looks a bit "difficult"...but with the use of ecc81 I understand why it has "power"...I recall ecc81 as a nice smooth and soft "musical" tube in a preamp which was maybe not the most neutral but really euphorically "rocking"...sweet memories 
Maybe its time fore a ElCheapo "revival"...dont know why I didnt build it when i was "at it", some time ago...I hope you will make a dedicated "ElCheapo-thread" with all relevant information, when you start building
btw, wasnt the 12AQ5 selected at first because the design goal was the ultimate low cost...if we do away with the low cost goal, what would be the best tube to use...EL84 ?
Maybe its time fore a ElCheapo "revival"...dont know why I didnt build it when i was "at it", some time ago...I hope you will make a dedicated "ElCheapo-thread" with all relevant information, when you start building
btw, wasnt the 12AQ5 selected at first because the design goal was the ultimate low cost...if we do away with the low cost goal, what would be the best tube to use...EL84 ?
Negative! Use current production TungSol "reissue" 6V6s out of Saratov, Russia. Poindexter uses the New Sensor offering in his more upscale and very elegant "Musical Machine".
The EL84 is a fine tube, but members of the 6V6 clan make more linear triodes. Look at 6V6 triode mode plate curves. They are as "beautiful" as the curves of the revered 6SN7.
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