[Amps] 2nd grid resistor blow Ameritron AMP 811H

[D Pipes]

Thanks for the response one reason a buddy has thought of that same tube is
it could be the first one in line taking some type of surge at switch on it
was R 19 and both times the rear right side tube.
thanks for you comments
Dan


> [Original Message]
> From: Vic K2VCO <vic at rakefet.com>
> To: <dpipes at earthlink.net>
> Cc: <Amps at contesting.com>
> Date: 08/15/2005 11:57:57 AM
> Subject: Re: [Amps] 2nd grid resistor blow Ameritron AMP 811H
>
> D Pipes wrote:
>
> > Thanks for the reply. I do have an added question. Would I be seeing
> > parasitic conditions before and without any RF ye? This has happened
only
> > when i switch the amp on (power switch) still in standby and no RF load
> > applied as yet just at start up on the power switch? thanks
>
> I doubt that this problem is caused by a parasitic.  I certainly would 
> not make a categorical statement like 'you are getting a parasitic 
> oscillation...'.
>
> It sounds like, more than anything else, a tube defect.  Yes, it is very 
> mysterious that it happened twice in the same place.
>
>
> -- 
> 73,
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco