[R-390] Allen Bradley Potentiometer Numbering Schemes anyone?

[Barry]

>>I was hoping I could find the specs without having to unsolder
>>anything and test it but I suppose that might not be the case.  It's
>>odd, though, that Krohn Hite still lists this generator (1200a) as
>>an active unit yet it's constructed of discrete components
>>(transistors, etc.) which looks to be 1980s techniques and components.
>
> Ahh, the 1200A.  Featured in many college EE labs to this day.  Not
> exactly Krohn Hite's best effort, but it works OK.  Pity they didn't
> include log sweep.  The Leader LFG-1300S and LFG-1310 are similar
> units, also widely used in college EE labs.  The Leaders do have log 
> sweep.

I don't know for sure, but I have a feeling this one came from a surplus EE 
lab auction at some point.  I basically needed an audio generator and had 
really wanted a nice HP 3310B, etc., but this one came along and since it 
does have basic sweep functionality, I got it.  It does seem to be a fairly 
well made unit (although not quite as well-made as similar HP equipment).

The potentiometer in question isn't too bad; it just gets a bit "touchy" at 
some points along the way.  I may opt to bend the tabs up, remove the back 
cover, and try some DeOxit and/or FaderLube in it.

Thanks again,
Barry - N4BUQ