[Johnson] New member with Ranger question

[manualman at juno.com]

You can try these articles:
Electric Radio: Simple Power Reduction for the Viking Ranger, Oct. 1998
Electric Radio: Adjustable Ranger Output ;  A Series of Useful Ranger
Mods, Dec. 2000

Pete, wa2cwa

On Fri, 1 Apr 2011 23:05:05 -0400 "Greg Mijal"
<bluebirdtele at embarqmail.com> writes:
> I wouldn't worry about the plate voltage. The 2E26 will be ok.
> If you want to lower the output or just move it around you may want 
> to try 
> an adjustable screen voltage scheme like a small rheostat (a 
> standard size 
> pot will not be able to handle the watts).  Take a look in the tube 
> manual 
> for the current and voltge on the screen grid and then use ohms law 
> to see 
> what resistance is necessary to move the screen voltage 
> significantly. Then 
> ohms law again for the needed watt spec for the adjustable resistor. 
> 
> Remember a 10 watt reostat is only rated to 10W when all of the 
> resistor is 
> in use.  Also, lower the grid ma's accordingly.
> Have fun
> 73's
> Greg
> WA7LYO
> Kinston NC
> ----- Original Message ----- 
> From: "Bill Cromwell" <wrcromwell at gmail.com>
> To: <johnson at mailman.qth.net>
> Sent: Friday, April 01, 2011 4:54 PM
> Subject: [Johnson] New member with Ranger question
> 
> 
> > Hi,
> >
> > Thanks for having a list like this and allowing me to join. I have 
> a
> > Johnson Ranger and I would like to use it in QRP operations. I 
> had
> > though about replacing the 6146 with a 2E26 and of course tuning 
> it up
> > accordingly with lower plate current and drive, etc. The 
> information I
> > have says a 2E26 will handle the plate voltage okay.
> >
> > Some other hams have suggested changing the plate circuit to use 
> the low
> > B+ instead of the High B+ for qrp operation and perhaps installing 
> a
> > switch to allow changing from one to the other. I haven't looked 
> yet but
> > that seems more reasonable. Has anybody here actually done either 
> of
> > those to reduce output to QRP levels? The AM phone operation is 
> not
> > important to me during the QRP adventures - only the CW operation. 
> What
> > about any other means of doing this?
> >
> > My Johnson Ranger is just now coming on the bench for TLC - 
> recapping if
>  needed, dusting, cleaning, resistor and voltage checks. Maybe when 
> It's
> > ready to run again I'll discover it can back off to QRP levels (5 
> watts
> > or less output) without bothering to modify it.
> >
> > 73,
> >
> > Bill KU8H