Johnson Ranger *no grid current*

[Brian Carling]

It sounds like you might have something wrong in the drive pot
circuit. Those are usually 25K WW units that form a voltage divcide
for the screen supply to the buffer I think.

If the bypass cap at the screen were shorted out or the other
resistor in the divider was to be OPEN, I think it might exhibit the
problems you describe.

I would begin by poking around in that area anyway, and check things
against the voltage charts in the manual.

Let us know how it works out!

Bry, AF4K

On 28 Jul 98 at 13:40, Keith wrote:


> Hi all,
>
> I have a Ranger I that I have been off and on trying to fix various
> problems. The latest one is a lack of grid drive. First let me say,
> this is the early model. It does not have the grid-block keying
> control circuitry.
>
> Ok, I have checked all tubes and they all are ok, I have even gone
> ahead and replaced the 6AQ5 (clamper) and both 6CL6's. Still no grid
> current.
>
> The only other thing I can say off the top of my head, is in the
> "OSC" position it seems ok with between 24 to 32ma, according to the
> manual. Now, also according to the manual when you put it in the
> "BUFFER" position, it should go to 40ma advancing the drive pot
> completely clockwise. This is not what I get. I can barely advance
> the drive pot beyond the one o'clock position and it pegs the meter.
>
> Let me also say that I had to replace the drive pot because it
> burned up. I have an exact replacement in it right now.
>
> If anything comes to mind, please let me know. I'd like to get this
> thing back on my desk before the millennium!
>
> Thanks,
> Keith,  KK5FE
>
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