[Amps] AL-811H

[Carl]

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 at frontier.com>
To: <amps at 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 at 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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