[Boatanchors] Johnson Ranger R35

Sat Feb 22 23:01:56 EST 2014

Wayne,

An important point is the current limiting resistor for the VR tube in the VFO is already a hot running component in the VFO box which should be replaced anyway during restoration with a higher wattage unit.  If the B+ is increased (and it will be by the loss of bleeder load plus that caused by the SS mod) then it puts more heat into the VFO box and that will vary more between loaded and unloaded B+ conditions.  If the B+ is significantly higher the VR tube and dropping resistor will both be operating outside the desired parameters.

Rodger WQ9E

-------- Original Message --------
> From: hwhall at compuserve.com
> Sent: Saturday, February 22, 2014 9:36 PM
> To: boatanchors at mailman.qth.net
> Subject: Re: [Boatanchors] Johnson Ranger  R35
> 
> Thanks for the comments, all!
> 
> I re-read what the Handbooks (plural) had to say earlier this evening. Besides draining off the filter caps when power is turned off, there were two other reasons I saw for pulling all that power down a big bleeder. 
> 
> (1) To ensure that a necessary amount of current was drawn from the supply to make the filter choke inductance always met the critical inductance, a condition which keeps a choke-input filter section from acting more like a capacitor-input filter (which lets the output voltage with light loading to float closer to the peak rectifier output voltage than a well designed choke-input filter will do).
> 
> (2) The above also contributed to reducing the peak current through the rectifier tube(s) so that more average current could be drawn for a given tube type without exceeding its max current ratings.
> 
> Since the pubished modification solid-stated the rectifiers, the advantage of (2) isn't an issue anymore. As long as the other stages (VFO, etc.) & components don't mind the extra max supply output voltage or the (probably larger) swings between key-up and key-down supply voltage, then the supply regulation of (1) becomes no issue. If so, then the removal of hefty bleeder loading isn't obviously an example of a mod that fails to understand the original designer's wisdom.
> 
> It's good to learn something new or relearn something every day. :-)
> ?
> 
>  Wayne
> WB4OGM
>  
> 
> 
> 
> -----Original Message-----
> From: hwhall &lt;hwhall at compuserve.com&gt;
> To: boatanchors &lt;boatanchors at mailman.qth.net&gt;
> Sent: Fri, Feb 21, 2014 9:11 pm
> Subject: Re: [Boatanchors] Johnson Ranger  R35
> 
>  I have a question about removing R35. It's the bleeder resistor on the power  
> supply, I see, and I assume that the original designers selected that for a  
> particular reason, otherwise they wouldn't be wasting all that energy n heart. I  
> assume that it was intended to provide the minimum load on the power supply when  
> the transmit key was open, improving the voltage regulation. Are there no  
> problems with removing that min load and the increased swing in supply output  
> voltage? 
>  
>   
> Wayne 
> WB4OGM 
>  
>  
>  
> -----Original Message----- 
> From: Jbrannig &lt;Jbrannig at verizon.net&gt; 
> To: Mr Bill Mellema &lt;n3wm at yahoo.com&gt;; Boat Anchors &lt;boatanchors at mailman.qth.net&gt; 
> Sent: Fri, Feb 21, 2014 5:20 am 
> Subject: Re: [Boatanchors] Johnson Ranger  R35 
>  
>   
>   
>   
> Bill,  
> Try this site.  I followed Phil's advice on my Ranger restoration and it   
> works very well.  
>   
> http://www.ad5x.com/images/Articles/Ranger%20Mods.pdf  
>   
> 73,  
> Jim  
>   
> -----Original Message-----   
> From: Mr Bill Mellema  
> Sent: Thursday, February 20, 2014 3:53 PM  
> To: Boat Anchors  
> Subject: [Boatanchors] Johnson Ranger R35  
>   
> I have a nice Ranger and need to replace R35 the large cause of heat. I'm   
> looking for a simple solution and would appreciate any inputs.  
>   
> Thanks In Advance..  
>   
> Bill N3WM  
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