[Amps] Problem with AL-811

[Tom W8JI]

> I am having a problem with my AL-811.  I cannot get more 
> than 150 watts out
> of the amp before the grid current exceeds 150mA.  I had a 
> tube go bad the
> 2nd to last time I used the amp, so I replaced all the 
> tubes. Now something
> is a miss.  All the tubes are lit.

Assuming you are tuning correctly by opening the loading 
control to reduce grid current and it just ain't working for 
you.....

Change the negative rail protection clamp diode. It is the 
single diode sitting all alone behind the meters by the tank 
coils.

73 Tom