"John L Stewart"
Go to this link- www.hparchive.com
to see the HP 207A Wide Range Oscillator listed under the equipment
heading.
20 Hz to 20 KHz in one twist of the dial. Uses a modified Wein Bridge.
** How funny, one of them sold on eBay yesterday:
http://www.ebay.com/itm/HP-207A-Audi...047675.l255 7
But does it use a tuning ganger or a multi-section pot?
( I cannot open that 12MB pdf at the moment. )
..... Phil