I highly doubt it. Schenker has always used diffent Marshalls everytime I have seen him live. The Vm can nail early UFO tones but he is probably still using 1959s and 800s
'When I Don't Have Anything Interesting to Play, I just Play Fast' But then who wants to hear 64 bars full of 32nd-notes except the douche-bag blowing them from the stage.
The fact is that he has been using 2205´s for quite a long time now. Check interviews and you´ll see. He said in an interview i read that someone working for Marshall has tokd him that.