[AMRadio] WRL Globe Champion 350

[russ dworakowski]

2 things to try-   the  modulator tubes  may be  out  of phase or  just a 
soft  HV supply.  Try  reversing  the cap leads  on  the plates  of  the  
mod. tubes....  If  you have a way of  checking  HV  measure it  under load, 
   you may  need some  bigger caps  in  HV section.   Russ.






>From: Dino Darling <k6rix at arrl.net>
>Reply-To: amradio at mailman.qth.net
>To: amradio at mailman.qth.net
>Subject: Re: [AMRadio] WRL Globe Champion 350
>Date: Tue, 25 Feb 2003 13:51:15 -0800
>
>Yep, it sounds like the Globe is broken!  You need to sell it to me ASAP! 
>:-)
>
>At 11:59 AM 02/25/2003 -0600, you wrote:
>>Hello to you all,
>>
>>I'm a new list member and am delighted to find such a resource.
>>
>>I've been a ham for a bit over 30 years, but almost never operated AM 
>>until recently.  However, my Dad, W5JHJ, has been a ham since, well, I'm 
>>not sure.  Probably 62 or 63 years (he'll be 81 this September).  He has 
>>had some health problems recently and, at 80 years old, is no Spring 
>>Chicken anymore. Anyway, he has some pretty neat old gear that he's 
>>maintained, which I used when I started out 30 years ago: a WRL Globe 
>>Champion 350 transmitter, a Hammarlund HQ-170 receiver, and a Hammarlund 
>>HQ-110 general coverage receiver.  All of these he's had since new (the 
>>transmitter kit was purchased in March, 1959).  He also has a mint 
>>condition FT-102 in superb condition.
>>
>>He's always maintained all of the gear in good working order and when I 
>>was very young (before kindergarten) was quite active.  But, with family, 
>>the decline of AM in favor of SSB, and increasing job responsibilities, 
>>his activity waned. Recently, he's become interested in operating a bit.  
>>So, last Saturday, we fired everything up. Aside from dirty switch 
>>contacts, we got it all working fine. We even made a QSO with WA5UEK, in 
>>Plano, TX, early Saturday evening.
>>
>>However, as we tuned up the Globe, we noticed that the plate current 
>>swings down under modulation.  Adjusting modulation gain doesn't seem to 
>>remove this tendency, though it is lessened until, of course, there is no 
>>modulation.  I also notice very slight negative deflection of output 
>>power, too.  Dad doesn't recall whether this was characteristic of the 
>>rig, and no mention is made in the manual.  Our signal report was fine, 
>>though we were only a couple of S-units above the noise, so poor audio 
>>might not be noticed.
>>
>>I want to understand why we're seeing the negative deflections under 
>>modulation.  I'd expect positive deflections, not negative ones. What is 
>>this telling me about the transmitter's operation?
>>
>>73,
>>
>>Kim Elmore, N5OP
>>                           Kim Elmore, Ph.D.
>>                        University of Oklahoma
>>         Cooperative Institute for Mesoscale Meteorological Studies
>>"All of weather is divided into three parts: Yes, No, and Maybe. The
>>greatest of these is Maybe" The original Latin appears to be garbled.
>>
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>
>Dino...k6rix at arrl.net
>
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