[Test-Equipment] re: HP8640B audio oscillator thermistor

[DJED1 at aol.com]

Interesting about the wein bridge oscillator in the 8640.  This audio  
oscillator, if my memory is correct, was the first product developed by Hewlett  and 
Packard in their garage, and started what became the preeminent test  
equipment manufacturer.  It's interesting, but I guess not surprising, that  they 
would have carried the original circuit over into a signal generator.
Ed