[Amps] Starting up a NEW Henry amp

[gudguyham at aol.com]

I tube the tbd inputs on all the amps I work on at full drive power.  When you get 1 to 1 at full drive the amp makes the most power it will.


Sent from the all new AOL app for iOS


On Tuesday, December 12, 2023, 4:39 PM, Alek Petkovic via Amps <amps at contesting.com> wrote:

For what it's worth, I have had terrible problems getting the input 
matching right on several amplifiers using the VNA, yet when using 
normal drive levels, as reccommended in the user/service manuals, tuning 
is a breeze. Therefore, I think that there is some truth in the 
assertion that tuning at low levels does not work properly.

73, Alek VK6APK

On 12/12/2023 7:27 pm, Rob Atkinson wrote:
>> If you try
>> to use the internal auto tuner it will not tune properly as it tunes up at low
>> power and the input impedance of the amp changes as the power increases.
> Power level  should not affect the impedance of a load.  If it does,
> then something is wrong.  A part may be heating up and changing value,
> in which case the matching network should be fixed.  You should be
> able to put a vswr analyzer on the amp input and see the R + X for
> some frequency, and those values should hold for whatever drive power
> you use on the same frequency.
>
> 73
>
> Rob
> K5UJ
>
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps

_______________________________________________
Amps mailing list
Amps at contesting.com
http://lists.contesting.com/mailman/listinfo/amps