"patrick-turner"
The 207A is described as an audio sweep oscillator, which I assume means the
F starts at 20Hz and over a time period the F is smoothly changed up to
20kHz, enabling the audio F response of filters and speakers etc to be seen
on a CRO screen.
** Not at all, it is not a sweep generator.
Operation is purely manual and its uses rather limited to things like
testing audio lines ( in studio and broadcast) for flat response, checking
limiters and VU meters and also maybe speakers in production for unwanted
rattles and noises.
Audio sweep generators typically used the difference ( or beat) frequency
between two RF oscillators.
See pic of HP207A he
http://www.ebay.com/itm/HP-207A-Audi...047675.l255 7
.... Phil