[Heathkit] DX-40 Keying trouble

[Mike McCarty]

Robert Nickels wrote:
>   On 8/30/2010 3:51 PM, Glen Zook wrote:
>> It showed less than 0.2 ohms to ground from the B+ line
> Some build runs of the National HRO-500 are notorious for disk ceramic 
> failures, and the maximum DC voltage in this receiver  is 12 volts!   
> The root cause of the problem is silver migration, which remains an 
> issue even today for manufacturers of multilayer ceramic capacitors, 

Ah, I wondered about the cause. That's an interesting bit of
information. The same cause as "mica disease" in older IFTs.

[...]

Mike
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