[Heathkit] HW-16 L9 value

[hwhall at compuserve.com]

Power out is 25W on 15M with the crystal

Coolness, that's about what I'd seen numerous people report for that rig.
WayneWB4OGM

-----Original Message-----
From: Mark K3MSB <mark.k3msb at gmail.com>
To: Gutfrucht, Alan <agutfruc at chicagobooth.edu>
Cc: heathkit <heathkit at mailman.qth.net>
Sent: Fri, Apr 10, 2020 8:21 pm
Subject: Re: [Heathkit] HW-16 L9 value

Got a bunch of replies and it looks like the VFO drive is low on 15M.
Here's what I measured:

Driver 6CL6 Pins 2 and 9 are for grid #1.

VFO
80M:  1300 mV PP
40M:  821 mV PP
15m:  662 mV pp

Crystal
80M:  5.4V PP
40M:  6.0V PP
15m:  6.4V PP

Driver 6CL6 Pin 6 Plate
VFO
80M:  14.7V PP
40M:  11.4V PP
15m:  2  V PP (about)

Crystal
80M:  20.0v PP
40M:  17.4V PP
15m:  5.6V PP

Power out is 50W on 80M and 40-45W on 40M VFO or Crystal.

Power out is 25W on 15M with the crystal,  or with the VFO and the tube
shields removed.

73 Mark K3MSB


On Fri, Apr 10, 2020 at 8:05 PM Gutfrucht, Alan <agutfruc at chicagobooth.edu>
wrote:

> Mark,
> Just a guess but have you tried a 40M crystal on 15M instead of the VFO?
> Many years ago I had a similar issue (not Heathkit) with a low output
> voltage on an external VFO. It worked fine on one band but not on the other
> bands where it operated double or triple the fundamental.
> Regards,
> Alan, WB2FZC
>
>
> On Fri, Apr 10, 2020 at 6:32 PM Mark K3MSB <mark.k3msb at gmail.com> wrote:
>
>> 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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