> On Sep 4, 2016, at 11:26 PM, Vic Rosenthal 4X6GP <k2vco.vic@gmail.com> wrote:
>
> This is a common problem with this amp and the SB-1000 which is similar. You
> don't need to operate on 160m for this to happen. Here is an article which
> discusses the placement of a "corona washer" on the bandswitch to prevent
> this. Make sure you install such a washer when you fix the switch:
>
> <http://www.northland-drifters.net/SB1000Project.htm>
Will do!
> The article also suggests replacing the parasitic suppressor with a different
> type. The original style parasitic suppressor is fine as long as the carbon
> resistor hasn't changed in value or even opened up. I would check this
> resistor and replace it if necessary. The nichrome type of suppressor isn't
> better and heats up more on 10 meters than the stock type.
Yes, I’ve read the debates on this.
> Also while you are at it check the plate RF choke. There were several
> different chokes used in the manufacture of the AL80A and the early ones had
> a series resonance on 17m, which caused them to burn out if operated on that
> band. If the choke is one solid winding without gaps, replace it with an
> AL80B choke that you can get from Ameritron.
Uh. Yeah. I have no choice but to do this now… Part has been ordered.
Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net
Web: http://boringhamradiopart.blogspot.com
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901
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