[Hammarlund] Looking for tube shields and 5U4 replacement.

[yash at aol.com]

                    Just pulled my HQ170 off the bench, performance is way beyond what I thought it could do  on AM. My new rig is very nice ,but is missing all, the tube shields. Does any one know of a source for them? 
           My second question is the 5U4 was changed over to a solid state tuber, good,bad or makes little difference? I thought with a rig this old ,maybe stress on something?
thanks
dale wt4t