[Test-Equipment] re: HP8640B audio oscillator thermistor

[Steve Byan]

On Jan 17, 2006, at 3:24 PM, Dave Brown wrote:

> Yes 'twas the 200A oscillator-I have a 200C here that I still use  
> occasionally-works well.
> Interesting to note that it's not generally recognised/known the  
> 200A style 'horizontal' box went out to the 200C model number  
> before the 'vertical' style box took over that is widely known as  
> the 200CD. Most seem to recognise there was an A and a B that were  
> 'horizontal' but the 200C seems to have been forgotten.

I believe there was a 200D also. I believe they were all  
simultaneously in production. The features of the 200A and 200B were  
combined in the vertically-styled 200AB and the features of the 200C  
and 200D were combined in the vertically-styled 200CD. If I recall  
correctly, the AB series had higher output power, a smaller frequency  
range, and higher distortion than the CD series.

I've got a 200A, a 200<X> (I've forgotten whether it's a B, C, or D),  
and several 200AB's and 200CD's in my collection.

There was also a 201 series of audio oscillators; some of these show  
up in a rack-mount form  with an "R" appended to the model number.  
Fair Radio had some 201CDR's in their catalog a while back, if I  
recall correctly.

Then there's the 205 and 206; big 6U rack-mount jobs.

Regards,
-Steve
--------
Steve Byan <stevebyan at mac.com>
Littleton, MA 01460