Zen,
Thanks for your reply.
Table 3-3 of the manual suggests typical LF limits of 4.70 and 9.09 MHz on the two ranges in question. My units get very close to, or past, these values before the output dies, so it may well be typical. A third unit I have just keeps going to the physical low frequency limit of the tuning knob. So I am not greatly concerned¡but I was simply curious to know whether other users of these see the same thing.
In my (albeit limited, compared with many on this board) experience of Tek stuff of this vintage, the designs were usually not so marginal.
And no, I don¡¯t propose to fiddle the tuning slugs: the limited SA capability I have suggests that the units are within, or very close to, spec.
We find many things to play with when we are sitting in COVID lock-down!
Roman
