[Heathkit] HW-16 L9 value

[hwhall at compuserve.com]

Since the final and those two sit in the same compartment, I suspect some kind of feedback is happening from final tube and/or tank coil to those stages.  That 25W might not even all be in a ham band in that case.Checked or replaced the final tube?Checked or replaced the driver tube?
Ensure the grid bias is correct for the driver?Absolutely sure the HG-10 is delivering enough drive AND on the right freq?
Are you having fun yet?  :-)

WayneWB4OGM

-----Original Message-----
From: Mark K3MSB <mark.k3msb at gmail.com>
To: heathkit <heathkit at mailman.qth.net>
Sent: Fri, Apr 10, 2020 4:32 pm
Subject: Re: [Heathkit] HW-16 L9 value

Well,  I tried a bunch of things and here's what I found.    L9 Seems to
be good.

I'm getting 25W out on 15M when L9 is peaked.... but... wait for it....
ONLY if both tube shields for the Oscillator and Driver are removed.

If I put either or both tube shields on,  the power drops to 1W out.
Repeatable.

The tubes test good.

Huh?

Mark K3MSB

On Wed, Apr 8, 2020 at 8:56 PM Mark K3MSB <mark.k3msb at gmail.com> wrote:

> Working on an HW-16.
>
> 80/40 are fine;  no power out on 15M.
>
> What is the value of L9 supposed to be?  I'm measuring about 1.9 uH with
> one end disconnected from the bandswitch.    I see a  very slight
> adjustment when I adjust it.
>
> Output of the 6CL6 is find on all bands,  and output of the driver are
> nice on 80 and 40.
> Nothing on 15M.  I'm driving the radio with an HG-10B.
>
> I followed the alignment procedure and adjustment of L9 does nothing.
>
> 73 Mark K3MSB
>
>
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