DX-60 Problems

[Kenneth G. Gordon]

Sounds to me at though your final amp tube has "grid 
emission" usually caused by severe overload at one time or 
another in its life.

My suggestion is to replace the final with a new one and 
test again.

There MAY be a similar issue with one of the other tubes, 
perhaps the driver.

Ken Gordon W7EKB


On 4 Dec 2009 at 13:18, Jim Schnurr wrote:

> I have a DX-60 that works well on CW putting out 50-60 watts at 150
> ma. of plate current . On AM it puts out 34 watts of carrier and
> modulates to 50 watts but the current is too high at 110 ma.   In the
> CW mode the resting plate current is 60 ma. instead of 20 ma. as the
> book calls for.  All votages on V-3 (6146) appear correct. I would
> like to use on AM if I can get carrier output to correct levels.  I
> have checked bias and screen supply voltages and they are correct. Any
> and all suggestions are most welcome.
> 
> Thanks, Jim 
> 
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