[Johnson] DO NOT Solid State the Power Supply in your Ranger!!

[Sherrill Watkins]

Dear Tim: I wished you had researched this matter before you did the work. It
is a serious mistake to solid state the power supply in any tube radio.
Several months ago I posted comments and reasons to this effect on this
reflector. This was based on the cautions and warnings that have appeared in
several article that were published in ELECTRIC RADIO MAGAZINE and The OLD
TIMERS BULLETIN. By doing so you are creating additional stress on all the
electronic components, creating more heat and damaging all the tubes because
of electron stripping from an instantaneous application of B+ before the
electron cloud has formed properly around the cathode. I urge you to change
it back to the original vacuum tube type! Also, do not allow the AC line
voltage to exceed 115 vac. (I don't care how many people have converted their
power supplies to solid state, it is NOT recommended by those that really
know vacuum tube technology and is based on fact! I you do not believe me,
then read the articles!) -73-Sherrill W. k4own. 

-----Original Message-----
From: Tim Anderson - AG4XM [mailto:AG4XM at ARRL.NET] 
Sent: Sunday, October 17, 2004 5:46 PM
To: Johnson at Mailman. Qth. Net
Subject: [Johnson] Solid State Power Supply in a Ranger 


I've solid stated the power supplies and beefed up the electrolytics in my
Ranger I and it's working fine but of course the B+ voltages are now too
high. (Around 800 on the high B+ and 600 on the low.) I've been using a
variac set at around 90 volts on the mains to drop them down to a safe range.
Anybody have a more elegant solution to drop the B+? 73 Tim Anderson, AG4XM
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