[Amps] Ameritron Amps

[R L Measures]

On Aug 5, 2006, at 3:00 AM, Tom W8JI wrote:

>>> At 50Hz - 60Hz, nylon works well, quite but at 20MHz it
>>> gerts hotter
>>> than ____.
>
>> Sure, but that's change in frequency of x400,000, not x4.
>> How does nylon
>> do at 200Hz?
>
> The only commercial amplifier using those tubes changed to a
> nichrome suppressor and continued to have the same problem
> with the same tube source. That means either the parasitic
> thing was wrong, or the nichrome doesn't do anything
> special, or both. Since I have looked at nichrome
> suppressors and the Chinese tube, my bet is on both.

Ni-Cr wire (resistance wire) suppressors work to lower VHF-Q the same  
way that Cu wire suppressors do, the difference is that since  
resistance wire adds R it additionally lowers VHF-Q. This allows a  
suppressor using the same resistor to be built with a lower VHF-Q  
than would be the case using copper wire.
- note - VHF suppressor Q is proportional to VHF amplification and is  
inversely proportional to the parallel-equivalent RL at the anode's  
VHF self-resonance.

>
> 73 Tom
>
>
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R L MEASURES, AG6K. 805-386-3734
r at somis.org