[AMRadio] Valiant carrier...

[Ron Youvan]

Rick wrote:

> How efficient is the RF stage of the Valiant? The manual seems to claim
> about 75% but I haven't been able to achieve that. I have read that the
> Valiant prefers the original 6146 to any of the later versions. Can someone
> tell me how critical this is? I am using 3-6146A's and wonder would I get
> better performance from the plain 6146? I am afraid the turret capacitors
> are breaking down under load and causing a little problem with output. So
> far, 100 watts of carrier in the AM mode is the maximum I have achieved.
> That's running 8 ma drive and 330 ma plate current. All tube voltages are
> well within tolerance.
> Thanks for any advice you may give.

   I don't know the Valiant, but 75% using class "C" should not be a 
problem, but 400 Watts PEP from three 6146s seems a bit of a stretch.
I think you are going to need between 800 and 900 Volts on the plates to 
maximize the power output to do it.
-- 
    Ron  KA4INM -   Every HAM should have at least one desk MIC,
                    it's the perfect place to hang the cans when
                    CW is "arm chair copy."