[AMPS] TL-922 Filament Transformer Protection

[Rich Measures]

>>This (VHF) ringing occurs whenever there 
>>is a transient in anode-current.  I contend that RF input contact arcing 
>>(hotswitching) during relay closure will produce transients in 
>>anode-current -- and that the resultant ringing in the anode circuit will 
>>be fed back by the feedback C of the amplifier tube.  .  
>
>HOW?
>
€ A spark is reliable producer of wide-band feculence. 

>How does closing a relay wether it is a hot closure or not produce a 
>transient in anode current?
>
€  hotswitching causes a spark. 

>I always thought anode current (other than bias current) was produce by a 
>driving signal.  

€  The spark is connected to a wire that connects to the input of the 
tube. 

> Hot switching is not good, but I don't think it is a 
>cause of anode current transients.  

€  When I was on 1296MHz, I could hear spark-plug interference from 
automobiles 400m distant.  



Rich...

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


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