I havent had any H's come thru here that werent neutralized but extended
tuning does cook the suppressors on 10M.
I tear out that stuff and wrap the original coil around one of a pair of 100
Ohm Ohmite OY series resistors in parallel.
All the AL-811 family are quite unreliable due to a combination of bad tubes
from China, design, and QC. It is not on my recommended list unless its dirt
cheap and you use 572B's.
Carl
KM1H
----- Original Message -----
From: "Tom Osborne" <w7why@frontier.com>
To: <amps@contesting.com>
Sent: Sunday, February 26, 2012 7:12 PM
Subject: Re: [Amps] AL-811H
> Thanks for the info. I have a friend here who has one about a year old
> and was wondering about that. 73
> Tom W7WHY
>
>
>
>
> The newer ones have a whole different suppressor scheme than the older
> ones. if this is an older amp you can update it with the new parasitic
> board designed for the newer 811H amps. If this is a newer amp and already
> has the updated suppressor board then there may be a different issue. The
> older 811H amps I don't think were neutralized. The newer 811H amps are
> neutralized.
>
>
> In a message dated 2/26/2012 6:55:57 P.M. Eastern Standard Time,
> w7why@frontier.com writes:
> On the 3830 contest reflector someone posted a comment that "The AL-811H
> has
> a know problem of the parasitic chokes burning up on 10 meters." Is that
> a
> true fact on those amps? 73
> Tom W7WHY
>
>
>
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