[AMPS] RE: 4cx10000

[Rich Measures]

>
>>       Somehow I wish more people would run tubes like 4CX5000 or
>>       4CX10000 or similar, think we would have less splatter and
>>       cleaner/nicer sounding signals on the band.  
>>       These days we have rigs with very big power spikes that flat
>>       tops the amplifiers and also people that drives the crap out of
>>       their 1500 W amps to make them deliver a puny 350 Watts more. Take a
>>       good listen to the SSB signals of today, at least 75% of  them
>>       flat tops or doesn´t sound right.
>
>Maybe, but then we must also think of all the wonderful signals 
>that would come from grid driven tetrodes with poor screen or bias 
>regulation.
>
€  Tom - - How can grid bias regulation be a problem when the grid 
current is zero? 

>Grounded grid triodes, if properly tuned, enjoy the benefit of heavy 
>negative feedback. That feedback makes for very clean 
>amplifiers.

€  good point

>The proper way to tune a grounded grid PA is to actually 
>OVER load the PA slightly, and then reduce power in operation.
>
>A better way to reduce splatter is to educate the idiots who turn up 
>the internal power controls of  their rigs, in a CB-like manner. 

€  amen

>
>Most radios are very poor IMD performers both at very low and very high 
>power.  Many tetrode amps wrongly suggest that running a 100 
>watt radio at 10 or twenty watts makes a cleaner signal, that isn't 
>true at all. The opposite is actually true.

€  So don't take suggestions from tetrode amplifiers.  
>
>While a babied overkill properly designed tetrode might be OK, 
>there is just too much to go wrong in the hands of people who can't 
>load a triode. Either PA, especially the GG triode, would be cleaner 
>then the radio anyway.
>
€   true.  However, a pair of properly loaded 3-500Zs gets pretty nasty 
when driven by 200w.  


Rich...

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


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