[R-390] Non-A alignment question

[nryan at mchsi.com]

Nice tip, Roy, and thanks for that.

I think you are referring to the CX-1363/U test lead.  I dashed over to mine and checked it for leakage and it's OK.  It happens to be one I made using new components in an identical housing, but it never dawned on me that vintage units should be checked for sure.

The test lead can be viewed on page 2-10 of the URM-25D manual TM 11-5551-D.  It's simply a blocking capacitor network comprised of a .1 mF @ 400VDC capacitor in parallel with a 510 pF @ 500VDC mica capacitor.

Vy 73 de Norman, KG4SWM
-- 
Any activity becomes creative when the doer cares about doing it right, or doing it better. -- John Updike


Roy Morgan wrote (in part):

NOTE:  If you are using the URM module that has a single capacitor in  
it, replace that thing before going very far.  It may well be leaky  
and let B+ into your URM attenuator, or let grid voltage leak off from  
the radio.

Roy

Roy Morgan
k1lky at earthlink.net
K1LKY Since 1958 - Keep 'em Glowing!