[Johnson] Ranger 1 with no grid current

[Harry Vaught, KT4AE]

Then the problem is above my pay grade.

Harry, KT4AE

On 5/28/2011 6:53 PM, Todd Nannie wrote:
> On your suggestion I checked the resistor under the band switch shield and it was fine.
>
> Thanks,
> Todd
> K2DN
>
>
> --- On Sat, 5/28/11, 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: johnson at mailman.qth.net
>> Date: Saturday, May 28, 2011, 4:51 PM
>> 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
>>>>>
>>>>
>> ______________________________________________________________
>>>>> Johnson mailing list
>>>>> Home: http://mailman.qth.net/mailman/listinfo/johnson
>>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>>> Post: mailto:Johnson at mailman.qth.net
>>>>>
>>>>> This list hosted by: http://www.qsl.net
>>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>>>
>>>>
>> ______________________________________________________________
>>>> Johnson mailing list
>>>> Home: http://mailman.qth.net/mailman/listinfo/johnson
>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>> Post: mailto:Johnson at mailman.qth.net
>>>>
>>>> This list hosted by: http://www.qsl.net
>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>>
>>>
>> ______________________________________________________________
>> Johnson mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/johnson
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Johnson at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>