[AMPS] AL1200

[km1h@juno.com]

On Tue, 22 Sep 98 09:16:39 -0800 Rich Measures <measures@vc.net> writes:
>
>>
>>
>>On Mon, 21 Sep 1998 11:28:38 EDT TOMK5RC@aol.com writes:
>>>
>>>I have an Ameritron AL1200. The parasitc suppressor flashed a number 
>of 
>times,
>>>only on 20 meters, and finally burned up. I replaced the resistor 
>with 
>>>two 120 ohm 2 watt carbon resistors in parallel. I also widened the 
>diameter 
>>>of the coil. The parasitic has now moved up to 10 meters.
>>>
>>>Anyone with similar experiences?
>>
>>There have been several iterations of the AL-1200 stability problem 
>Tom.
>>Get the latest parts and info  from Ameritron.
>
>I hear that the "neutralization" mod decreases VHF stability.  


Dunno, but I "hear" that Monica did Slick Willy too but what does that
prove? The AL-1200 is still a top choice for contesters. 


>
>>Also carefully inspect the bandswitch for arcs.
>
>amen
>
>>There is also a 1N4007 diode that is used to protect the B minus rail
>>from rising. This diode will often short and cause high idling 
>current
>>which will add to stability problems. Replace with a 1N4008.. ...
>
>1N5408?  The 1N5400 series of diodes has a much higher peak current 
>rating than the the 1N4000 series.  


Typo...I meant 1N5408...the general purpose 1000PIV 3A diode for the
modern ham. 

73  Carl  KM1H




>
>
>
>Rich...
>
>R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  
>
>
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