[Boatanchors] Johnson Ranger R35

[Rob Atkinson]

On Sat, Feb 22, 2014 at 9:35 PM,  <hwhall at compuserve.com> wrote:
>   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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