[Heathkit] DX-40 Keying trouble

[Carl]

----- Original Message ----- 
From: "Mike McCarty" <Mike.McCarty at sbcglobal.net>
To: <heathkit at mailman.qth.net>
Sent: Monday, August 30, 2010 6:24 PM
Subject: Re: [Heathkit] DX-40 Keying trouble


> 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



Not at all, some misinformation lives on forever and has no bearing on 
current problems.

Carl