Johnson Ranger VFO Instability

Bill Evans bevans at EBSYS.MB.CA
Thu Jan 14 00:44:14 EST 1999

Wish to clarify tube type referred to in my posting yesterday.  Lost the
first numeral.  Military tube that is reputed to greatly stabilize the
Ranger VFO is a Type 6136 - ruggedized 6AU6.  But where do I purchase one??
-----Original Message-----
From: Bill Evans <bevans at>
<johnson at>
Date: Tuesday, January 12, 1999 11:48 PM
Subject: Johnson Ranger VFO Instability

>My restored Ranger exhibits substantial VFO instability on the higher bands
>when I key it for cw operation.  Key down, the rig rises steadily in
>frequency about 500 Hz, then will come back down - only to rise up again.
>I moved the screen regulator series resistor outside of the VFO enclosure,
>increased it from a 2 Watt rated unit to 10 Watts, and use an exhaust fan
>over the PA in an effort to stabilize the temperature; all to no avail.
>I have heard that use of the militarized version of the 6AU6WA  --  a
>136  --  will provide greatly improved VFO stability.  Where would I obtain
>one of these tubes?
>Does anyone have any other suggestions regarding my problem?  I really do
>want to use this lovely rig on cw, but no way in its present condition.
>Help please!
>Bill Evans, VE4UD
>313 Carpathia Road
>WINNIPEG, Manitoba, Canada
>R3N 1T2
>PH:   (204) 489-7434
>FAX:  (204) 487-7199
>E-MAIL: bevans at

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