I worked on the chassis of the Westinghouse model 165 and I had a awful motor boating with a high pitched squeal.
I went through everything I could think of to get it working , and a friend of mine Peter Heembrock said ” make sure the tube shields are in place.”
Well after I put the shields on it works very good.
I did not think it would make that much difference, but it did.
When I bought the radio there were no tube shields on it, so I never gave it another thought.
A lesson learned.
Dan in Calgary