So have been wondering for a long time if this one was possible. All the talk on the drawing board about tube circuits in 500/51X format and Peter's G9 got me motivated to investigate. After crunching the numbers and many discussions this week with engineer co-workers, I believe it's possible to do in dual bay 51X format and still stay within spec, without any chages to the original circuitry, the power is there, definately cutting it close, but doable. Would be possible to do in 500 format as well, but would require 3 bays to pull it off and stay within spec, don't know if that would be a better way to go, thinking maybe having this one be a DIY exclusive would be cool, opinions on that one are welcomed. To pull it off I'm going to need about a minimal 83% efficient flyback circuit for the HV, and 80% efficient buck converter for the heaters, but I believe both are doable.
Just want to make sure if I pursue this that there is enough interest. Assuming there is I would like 1 or maybe 2 people to prototype along with me once design is completed. Will provide boards and metalwork for free, it just needs to be someone that: a) has an la2a for comparison purposes and b) has the time and finances to build one. Volker (silent arts), don't want to nominate you but if you're up for it would love you to be one of the people, your choice of course. Anyone else who is interested please email me.
Working with the engineers on the flyback converter, should have done within a week, since the remainder is simply a copy and paste clone project (ie no real development involved) I expect this to move along rather quickly, already have the original circuit redone in my software.
Really rough front panel arrangement, still a bunch of detail work to do, but you get the idea.