Re: [Amps] AL-1200 Pop/Arching, 756 Pro II failure

[Dana Roode <K6NR@ARRL.net>]

Rich -

> -  Does your AL-1200 have the "neutralization" circuit?

I'm not sure, how do you tell?  There is a small diameter red wire wrapped 
around a small toroid core feeding the +HV to the plate; there is a thick 
flat-wire copper coil with a resister in it connecting the plate to the tank 
circuit.

Is there a problem with this circuit?

> €  I would Not depend on hope and instead put a Low-pass filter between 
> the 440 and the amp.  Another precaution might be to retrofit a lower-Q 
> VHF suppressor -- provided you don't mind losing 2% of your 10m power out.

I certainly want to protect the exciter from any future amplifier problems, 
would a low pass filter do that, or are other things I can/should do?  Is it 
all a matter of VHF energy?

  Dana


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