Marcel,

About the maximum voltage, that might be in the TR7 specifications. OTOH, start with the pot at a low voltage and increase it until you achieve the results that you want.

The K3 EXT ALC default threshold is -4.0 volts, so that may be a good starting point for your experiments.

73,
Don W3FPR

On 1/13/2019 5:19 PM, Marcel Jorba via Elecraft wrote:
  Thanks to all of for your prompt answers
On CW it works great thanks to the carrier adjustment control

On SSB: it goes to 150W out very easy
Yes it is just for fun.
The K3 is great but the TR7 is funny and special.


One last question: Someone suggested to use a 9V battery  with a pot to inject 
a constant negative voltage in to the TR7. But any idea about the maximum 
voltage?
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