[AMPS] TL-922 Filament Transformer Protection

[Rich Measures]

>
>Come on Rich, use your head.
>
€  "I'm trying to think but nuthin' happens".  .  .Curly

>The low pass system on the input of the amp virtually guaranties 
>the rise time of any pulse is about the same as the rise time of the 
>desired signal. That's very well known!
>
>As for the relay cathode return closure causing a transient, that 
>assumption is silly beyond belief! 

€  Sparking contacts don't create transients?

>When the relay closes in the 
>cathode, the bypass capacitors--filament transformer---filament 
>choke---etc etc all slow the transition down. 

€  we are not talking about the bias contacts.  We are talking 
hotswitching the RF input contacts when a factory-stock 922 is used with 
a high speed T/R transceiver.  .  

>The slope of the 
>transient must be less than high audio frequencies after passing 
>through all that stuff.
>
>I'm amazed you try to propagate such BS in order to explain 
>something so easily understood.  
>
>> >>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?
>
>Good question, now look at Rich's reply......
>
>> € A spark is reliable producer of wide-band feculence. 
>
>As Rich is also!
>
€  __________
>........


Rich...

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


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