[AMRadio] Why I Chose A Globe King 500B

[russ dworakowski]

Yes a lot of  old  rigs [transformers ]  suck up  a lot  of  water  in the  
air  and  eventually causes  them  to  fry.  Johnson  is  no  exception  to  
that  fact.  I  have  all  new  iron  in  my  500B.  Russ


>From: "Dr. David Knepper" <knepper at lenzlink.net>
>Reply-To: amradio at mailman.qth.net
>To: <amradio at mailman.qth.net>
>Subject: RE: [AMRadio] Why I Chose A Globe King 500B
>Date: Wed, 24 Apr 2002 06:35:56 -0400
>
>I, too, owned a Globe King 400 and 500B at one time.  It was my experience
>that the Globe King was prone to premature high voltage and modulation
>transformer failure.  It was, in my opinion,  a cheapie unit that was a 
>step
>above a homebrew unit of that wattage class.  No wonder so few are left out
>there in operating condition.  When was the last time you heard any of them
>on the air compared to other manufacturers?
>
>I love my Collins!
>
>David Knepper - W3ST
>Publisher of the Collins Journal
>Secretary to the Collins Radio Association
>CRA website:  http://www.collinsra.com
>
>-----Original Message-----
>From: amradio-admin at mailman.qth.net
>[mailto:amradio-admin at mailman.qth.net]On Behalf Of Damon Raphael
>Sent: Tuesday, April 23, 2002 10:54 PM
>To: amradio at mailman.qth.net
>Subject: [AMRadio] Why I Chose A Globe King 500B
>
>
>There were very few commercial rigs produced in the 500 W Plate Modulated 
>AM
>category.
>The Johnson 500 covers the upper HF ham bands but not 160 meters and
>commands a much higher price than the GK.
>The Johnson KW Desk is a big monster which is way out of my price range.
>The BC-610 weighs 400 to 450 pounds and covers 1 to 18 mHz.  It does not do
>10 meters.
>The T-368 weighs about 680 pounds and covers 1.5 mHz to 20 mHz.  It does 
>not
>do 10 meters.
>I know that some folks have modified these rigs to cover the bands that 
>thet
>were not designed to do but I did not want to tackle that problem with the
>big beasts.  Just removing and carrying the modules is a weight lifting
>chore and should you fry a "big iron" component you are in deep #$@&*.  Not
>to mention the firestorm that could arise from a "golden screwdriver " mod.
>Both of the military transmitters require an external frequency control
>device.  The T-368 uses a dedicated exciter which is an added expense and
>maintenance problem.  I don't know if the T-3 can be used without that
>specific device when XTAL controlled.
>The Globe King 500B covers 160 through 10 meters and has a built in VFO.  
>It
>weighs about 275 pounds.  It is quite a bit smaller in size and weight
>compared to the military rigs.
>While the BC-610 in it's various versions is a commonly available unit, a
>T-368 for sale is much harder to find.
>Broadcast transmitters are available but are very large units and are
>difficult to run on more than one band.  To my knowledge, the commonly
>available units would be difficult to run above the 40 meter band.
>I started to scrounge for parts to build a 500 W rig but quickly gave up on
>that.  Here in Arizona, there are very few swapmeets so major building 
>parts
>are hard to find.   You don't want to have to pay Peter Dahl or eBay prices
>for that stuff.   If you have a shed full of old parts and "heavy iron" 
>plus
>the knowledge and experience needed to match up the component parameters 
>and
>if you have the tooling to do the metalwork, then homebrewing a big rig is
>the way to go.
>None of the above rigs have "good" audio as designed.  They all have to 
>have
>some modification to widen the frequency response to meet today's  
>standards
>for ham use.
>Given the above, I decided that the Globe King 500B was a reasonable value
>at today's prices.
>
>Damon Raphael, W7MD
>Tucson, AZ
>
>
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