[Johnson] Ranger 1 with no grid current

[Harry Vaught, KT4AE]

I'm glad you found the problem with the 68k resistor.  That's the one I 
was calling R8 or R6.  If yours is R5, we have yet another variant of 
the schematic.

This may not have happened to yours, but I would remove the bandswitch 
shield under the chassis and check R9.  I believe on mine that R9 was 
cooked (split open, not visible from outside the shield) due to added 
load from the bad R5/6/8, at any rate the 68k resistor.  When I found 
this it solved a host of problems from CW chirp to grid current.

Fortunately, for me, I only had the problem with R5/8/6, R9 and total 
recapping.  I haven't had to do any heavy-duty trouble shooting of the 
type you describe.

I know there is vastly greater knowledge on the Johnson reflector than I 
have but it has been dead lately.

There's much more activity on "AMFONE.net".  I would try:

http://www.amfone.net/Amforum/index.php

There are Ranger questions all the time and I think you'll have better 
luck there.

Good luck,

Harry



On 5/28/2011 3:14 PM, Todd Nannie wrote:
> I found the problem.
> R5 (68K ohm) resistor was bad(open), replaced it and now the Ranger seems to be working fine. Using a dummy load I can hear my CW and phone signals from another radio in the same room. I have no idea how much output I have. I need to hook it up to a watt meter.
>
> One problem I am having is that the OSC meter is peging hard to the right.
> I have checked the 3 ohm SH1 resistor and it checks out at 3.5 ohms.
> All of the voltages for the 6CL6 check out fine. I get negative voltage on pins 2 and 9 and the screen voltage is 99 volts.
>
> Any ideas?
>
> Thanks,
> Todd M. Nannie
>
>
> --- On Sun, 5/22/11, Harry Vaught, KT4AE<kt4ae at bellsouth.net>  wrote:
>
>> From: Harry Vaught, KT4AE<kt4ae at bellsouth.net>
>> Subject: Re: [Johnson] Ranger 1 with no grid current
>> To:
>> Cc: johnson at mailman.qth.net
>> Date: Sunday, May 22, 2011, 6:58 PM
>> I've had the following affect grid
>> drive on my Ranger:
>>
>> 1. Meter switch needed cleaning.
>>
>> 2. R8 or R6 depending on schematic, but at any rate the V3
>> screen grid
>> resistor had migrated to about three times its nominal
>> value.
>>
>> 3. R9 toast. Mounted on the bandswitch under the
>> chassis.  Accessible by
>> removing the bandswitch shield.
>>
>> None of these resulted in a total absence of grid current,
>> but it was
>> certainly reduced in some cases.
>>
>> Good luck.
>>
>> Harry, KT4AE
>> Maryville, Tennessee
>>
>>
>>
>> On 5/22/2011 5:21 PM, Todd Nannie wrote:
>>> I have a Ranger 1 that is not showing any grid current
>> on the meter when doing the tune-up procedure. It shows 32ma
>> on the OSC setting, it shows a reading on Buffer and Plate
>> (Don't remember exactly what those were) and no reading on
>> Mod.
>>>
>>> I have replaced all of the electrolytic capacitors. Id
>> not have a tube checker, but all of the tubes are at least
>> getting warm/hot
>>>
>>> Any ideas?
>>>
>>> Thanks,
>>> Todd
>>> K2DN
>>>
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>