[Johnson] Ranger Problem

[Gary Schafer]

First make sure your grid drive is right as the clamp tube will not 
operate properly if it is not.

Check that the clamp tube is set up properly. I think the ranger has 
one. If it's bias is set right on the edge it could give you the plate 
current properties that you see.

You could try removing the clamp tube and see what the plate current 
does. Not sure if they use it to cut the tube off on standby or just as 
protection for loss of drive.


Next check that the meter shunt has not changed resistance.
Best is to put another amp meter in series with the shunt or in the 
plate voltage lead. If you put it in the plate circuit lead it will read 
a little different as I think they actually measure cathode current in 
the meter circuit.

73
Gary  K4FMX


Wayne Light wrote:
> Hello guys...
>  
> I would appreciate some advice as to where I should start looking.
>  
> I have picked up a Johnson Ranger that looks to be in good condition. All functions work and I get about 30 watts output on my watt meter.
>  
> The problem is, on the lower bands, I get the most output on my watt meter when the Johnson's meter shows it to be out of resonate.  Adding to this my Plate current never goes above about 100 MA.  The manual indicates I should be able to dip this rig at about 130 MA.
>  
> I've checked the rectifier tube..in fact, all the tubes. I also put in a new 6146.
>  
> Can one nuturalize the Ranger?  Why would I be getting such poor plate output?  I don't think my transformer is defective.
>  
> Thanks for any advice!
>  
> K7NCE
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