[AMRadio] Globe King

[russ dworakowski]

Yes Charles,  I neglected to say,  I did replace all old electrolytics
in the speech amp.  The couplettes don't seem to be a problem.  As I 
remember- does the speech amp also have a compressor?  That seems to work OK 
as well,  without distortion.   Well the reason I used 1500 volts in the 
modulator is because thats what I had available.  The replacement was bad 
and the maker would not make good on it- so mods
came into play.  My intention was to keep it as original-  but when the 816s 
  kept flashing,  I found they are as rare as hens teeth.  Too pricy for 
something easily replaced.  I have not run mine in several years also.  
Neighbors complain- RFI big time.  Another story.
  73s  Good luck  Russ


>From: Charles Ring W3NU <charlesr at infonline.net>
>Reply-To: amradio at mailman.qth.net
>To: amradio at mailman.qth.net
>Subject: Re: [AMRadio] Globe King
>Date: Thu, 19 Sep 2002 15:11:36 -0400
>
>
>
>russ dworakowski wrote:
>
> > Charles,  I have a 500B,  that came to me as basket case.  I  ended up 
>with
> > all new iron.  Hopefully,  yours was stored well,  and not ina damp
> > location.  If so,  it would be good to just fire it up  and let it dry 
>out.
> > Its amazing how much moisture  those  old open transformers
> > soak up.    When all said  and done,my GK 500B,  had changes in the
> > modulator-  A higher voltage on the plate transformer- 1500v.  I put 
>neg. 5
> > volts bias  on the 811s.  In the speech amp,  I did not change anything. 
>  I
> > used a D104 mic and I got real good audio rpts.  I also solid stated  
>the
> > modulator  power supply-  the 816s  kept flashing over,so  bye bye.  
>Also
> > switched to 3B28s in the RF power supply.
> > Have fun!  Russ
>
>I have owned my 500A for 30 years but havent used it for maybe 15. It seems 
>to
>have survived basement storage with all iron intact. It already has 3B28's 
>and
>i can see that the 816's will be at least an inconvenience  so they might 
>go. I
>have a D104 and will try it before i modify the speech amp, but eventually 
>i
>want to get rid of the couplettes and try a Shure SM5B and a broadcast mic
>compressor left over from my years as a broadcast engineer. I am not 
>inclined
>to trying to boost the modulation since i won't be in an Arbitron-driven
>loudness war. I do see a number of very old original small electrolytic 
>caps in
>the modualtor that probably should be replaced.
>
>73 de W3NU
>
>
>
>
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