[Johnson] .02 replacement cap

[David Propper]

Joe,

I traced down an audi problem in my Ranger I several years ago that was tied to a ceramic disk coupling cap in the audio stages, not the electrolytic caps.

FWIW and 73,
Dave
On Oct 21, 2013, at 7:07 PM, WQ9E at btsnetworks.net wrote:

> Hi Joe,
> 
> The voltage rating is important and the orange drop cap would not cause hum on the audio just because of its construction.  The only critical aspect for this cap is the voltage rating and if the orange drop meets or exceeds that it should work fine.  
> 
> It sounds like something else is going on with your Ranger. Perhaps a mic connection was disturbed in the repair process? Are you sure  there is no hum on the carrier in CW mode?  Does the hum level vary with the mic gain level?
> 
> I have replaced this particular cap with various styles of HV caps in the past without any problem.  I have several Ranger and Ranger 2 transmitters used in my vintage radio setups.
> 
> Rodger WQ9E
> 
> -------- Original Message --------
>> From: "Joe Roth" <wc4r at usa.com>
>> Sent: Monday, October 21, 2013 6:43 PM
>> To: johnson at mailman.qth.net
>> Subject: [Johnson] .02 replacement cap
>> 
>> I am replacing a a paper tubular cap in a Johnson Ranger. It is .02 uf, 1600v (c69). I had an orange drop film cap on hand but that will not work as it causes hum on the TX audio.
>> Anyone have a proper replacement or a source? Tried the usual (mouser, antique supply) with no luck.
>> Joe 
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> 
> 
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