[Heathkit] Differences - HD-1422 and -A model Antenna Noise Bridges

[jack m]

Hi Gang,

 

I have an HD-1422-A Antenna Noise Bridge, but only have the HD-1422 Manual.  Anyone know what the difference is?  Circuit board in my "A" has same part number as shown in the non-A manual x-ray view.

 

Anyone know of a source for the 200 ohm pot?  Mine is burned.  Heath Part number is 10-1234 - a 200 ohm linear taper pot. 

 

Thanks.

 

Jack
 		 	   		  
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