On Aug 15, 2005, at 10:47 AM, Vic K2VCO wrote:
> 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.
To find out if it was a parasite or not, measure the ohms of the
parasitic suppressor R on the tube that blew it's grid R. If the ohms
are still within tolerance, it was likely not a parasite.
- I have observed that serious parasites in 811s can put so much EMF
on the filament, that it shatters into pieces and falls to the bottom
of the glass envelope.
>
>
> --
> 73,
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco
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>
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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