[AMPS] where to find info

[Rich Measures]

>> Date:          Sun, 24 May 1998 00:47:12 -0500
>> From:          Jon Ogden <jono@webspun.com>
>
>Hi Jon,
>
>Despite your questions about how to get your 4-1000 to work 
>right on ten meters, you seem to suddenly now not have problems with 
>performance.
>
>> >The tube might forgive you, but you might not forgive it! 4-1000A's 
>> >are notoriously unstable at high anode voltages, and getting a 
>> >bit scarce.
> 
>> I haven't found the tube to be any more unstable at 6 KV. 
>
>They absolutely are less stable with more voltage. A tube in 
>a circuit that is perfectly stable at 3000-4000 volts will often 
>oscillate like crazy at 5000-6000 volts. 

yea, verily.  More volts means more gain.  

>If the builder uses enough 
>conventional non-resonant suppression 

Is not vhf suppression anti-resonant?  There is undoubtedly no way to 
make the anode-circuit non-resonant. 

>to stabilize the system at 
>higher voltages, ten and fifteen meter performance will almost 
>ceratinly  suffer greatly.  

Greatly increased losses have not been reported by those who tried a 
lossier vhf suppressor in 4-1000A amplifiers.  Is 1% or so of additional 
loss at 28 or so MHz a serious drawback if the lossier suppressor 
improves stability at 82 or so MHz?   
>..........


Rich...

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


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