Thanks Damir; let me say this; it is sometimes easier for us new guys to follow the older schematics in terms of the maths and the reasons for part choices than it is in the CCS models. Thats why I happened to look at the Mullard. I don't like the high feedback though. Thanks for that tutorial earlier on the circuit math. The trouble with those posts for us is that by the time I have it sorted out you guys are long past that point and on to something else. It is much easier to learn on the all tube models for me at this point.