[Test-Equipment] re: HP8640B audio oscillator thermistor

[Dave Brown]

----- Original Message ----- 
From: "J. Forster" <jfor at quik.com>
To: <DJED1 at aol.com>
Cc: <test-equipment at mailman.qth.net>; <Ken.Grant at uhn.on.ca>
Sent: Wednesday, January 18, 2006 7:03 AM
Subject: Re: [Test-Equipment] re: HP8640B audio oscillator thermistor


> As I remember the first product was an audio oscillator. Many 
> designs used a lamp bulb
> as an AGC element. The Wein bridge puts out a very good sine with 
> low parts count,
>
> -John

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.

DaveB, NZ 



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