Hi M, I looked over at Tube Cad, the 5687 pcb is set to use the 5687 in the output position only. I have used the 6CG7/6FQ7 and 6N1P for the input stage, with very good success. But pretty much any of the usual suspects will be pretty much plug and play.
This has become my main line stage, crappy power supply and all. I use it with my DRD 45’s and I have recently converted my WE91 300b amps to a D3A front end. Sort of a cross between Damir and Bas H. I am using a anode choke rather than a CCS. This is still very much in the experimental stage. I have posted a little over at group build…John
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