Hello all! I have been lurking for sometime now, and finally decided to make myself an account. I am fairly new to electronics, and recently purchased a BK precision 2120 oscilloscope. I am having an issue with the display...I have adjusted the trace rotation as best as possible, but on the lower end of the CRT the trace seems to dip at the ends while at the top of the CRT the trace is perfectly straight. I have the service manual, but after reading it I am still unsure as to what it could be?
I have included some pics below. Thanks in advance!