[Johnson] ranger fuse

[Comarow, Avery]

I'd like to insert a plug here (okay, bad pun) for www.justradios.com as a supplier of X and Y bypass caps, as well as others, usually at a much lower price than the usual vendors. No personal agenda here, just a small business that is trying to do well by doing good. The antique radio crowd, of which I am also a part, thinks pretty highly of them.

Avery W3AVE


-----Original Message-----
From: johnson-bounces at mailman.qth.net
[mailto:johnson-bounces at mailman.qth.net]On Behalf Of K6JEK
Sent: Thursday, February 16, 2006 3:48 PM
To: johnson at mailman.qth.net
Subject: Re: [Johnson] ranger fuse



I've been taught to never put a fuse in the neutral line.  If there is 
a fault that puts the AC hot line somewhere that it shouldn't be and 
the neutral fuse blows, the danger still exists possibly right at your 
fingertips.   There have been many discussions of this topic on this 
forum including a nice post in defense of the Johnson design which 
maybe made sense at the time given the common wiring of the time.   But 
it doesn't make sense now especially for a 50 year old  radio in which 
failing components are likely.

On the AC bypass cap issue --  replacing them is a great idea.  We need 
to make sure they are capacitors designed for the purpose not the 
ordinary vanilla disc ceramics we have in our junk boxes.  For across 
the linethey should be a type Y capacitor.  These are readily available 
from Mouser, Newark, Digikey.   Here's a link the Vishay/Sprague 
website that describes theirs:  
http://www.vishay.com/docs/23092/aclinecp.pdf

They seem to have changed part numbers since I bought my supply of 
X1/Y2's which in addition to being the safe part for the job have the 
bonus of being a beautiful electric blue.   What could be more 
appropriate?

Jon, K6JEK

On Feb 16, 2006, at 11:04 AM, SBJohnston at aol.com wrote:

>
>> it's worth noting that the plug fuse values are asymetrical
>> eg... they are NOT the same value..and arent supposed to be. see 
>> manual
>
> That's why I used two when I modded my Ranger...
>
> Steve  WD8DAS
> Johnson mailing list
> Home: http://mailman.qth.net/mailman/listinfo/johnson
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:Johnson at mailman.qth.net
>



Johnson mailing list
Home: http://mailman.qth.net/mailman/listinfo/johnson
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:Johnson at mailman.qth.net