{Collins} Re: Fwd: Re: 6146B Neutralization technique



I just neutralized my Heathkit Marauder after a tube change with a very
simple technique.
Switch to 20m band
Pull the plate rectifer.
Stick your scope probe into the body of the final coil.
Key the radio and tune for minimum output on the scope.
It works FB here

73's
Greg
WA7LYO
----- Original Message -----
From: "David Harmon" <K6XYZ@xxxxxxxxxxx>
To: <altair@xxxxxxx>; <RMcGraw@xxxxxxxxxxx>; <ronaldron@xxxxxxxxx>;
<collins@xxxxxxxxxxxxx>
Sent: Thursday, July 22, 2004 8:20 AM
Subject: {Collins} Re: Fwd: Re: 6146B Neutralization technique


> Come on you guys.....hehehe.....it isn't all that hard!
> You can make it easier by cutting the filament pins off an old 6CL6 and
> insert it in the driver socket. If you do this, you will not have to
> remove the filament leads under the chassis.
> Remove the PA disable strap from one end and remove the 5R4.
> Connect the rig to a dummy with a T coax connector and put the 410 on
> the open end of the T.
> Then, follow the book....works every time....
> I can do the whole thing in 20 minutes!
>
> Regards
>
> Dave Harmon
> NSRCA 586
> K6XYZ[at]comcast[dot]net
> Torrance, Ca.
>
> -----Original Message-----
> From: collins-bounce@xxxxxxxxxxxxxxxxxxxxx
> [mailto:collins-bounce@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of John Painter
> Sent: Thursday, July 22, 2004 7:13 AM
> To: RMcGraw@xxxxxxxxxxx; ronaldron@xxxxxxxxx; collins@xxxxxxxxxxxxx
> Subject: {Collins} Re: Fwd: Re: 6146B Neutralization technique
>
> I started reading late, and don't know if we're talking about a KWM-2A
> or the 32S-series.
>
> I do know that properly neutralizing the -2A is quite a chore.
> There are four different circuits that enter into the neutralization of
> both the Driver and the Final. Two of these circuits are coupled,
> through
> C121. The two coupled circuits are the Driver Neutralization and what
> Collins called the "Feedback Neutralization." It's not actually a
> neutralization
> circuit but is R.F. Negative Feedback, to make the tuning of the
> Driver-Final combination more uniform over frequency.
>
> Because two of the four "neutralization" circuits are coupled, the total
> neutralization job must be done in a particular sequence. The Service
> Instructions are to perform the adjustments in the order of
> Final, Driver, and Feedback.
>
> I haven't dealt with the 32S-series, yet, but will, one day soon, since
> I've got a 32S-1 sitting on the roll-around rack with a red tag on it.
> I hope it's not as complicated as the -2A  :)
>
> John Painter
> W5LQS
>
> ----- Original Message -----
> From: "Robert & Linda McGraw K4TAX" <RMcGraw@xxxxxxxxxxx>
> To: <ronaldron@xxxxxxxxx>; <collins@xxxxxxxxxxxxx>
> Sent: Wednesday, July 21, 2004 10:12 PM
> Subject: {Collins} Re: Fwd: Re: 6146B Neutralization technique
>
>
> In just about all the broadcast transmitters that I've handled, the term
> "right side of resonance" comes to mind.  This was accomplished by
> adjusting
> the PA network for resonance as indicated by a dip in plate current and
> then
> adjusting for a slight increase in plate current which yielded slightly
> more
> output.  This increase was always accomplished by effectively reducing
> the
> value of C or tuning to the high side of resonance.  Going to the other
> side
> of resonance did not product an increase in output.  This is true on the
> AM
> rig that I run on 160M. (See my call on QRZ.COM for a pix of the little
> rig.)  as well as the grounded grid 8877 that is on VHF.
>
> It's been a while since I've dealt with a pair of 6146's, although I
> have
> just acquired a 32S-1 that I'll get on the air in a couple of weeks or
> so.
> I look forward to seeing just how that PA performs.  I'd expect that
> when
> properly neutralized that I will find that bringing the PA slightly out
> of
> resonance will provide slightly more output and better linearity.
>
> Stay tuned.
>
> 73
> Bob, K4TAX
>
>
> ----- Original Message -----
> From: "Ronald Mott" <ronaldron@xxxxxxxxx>
> To: <collins@xxxxxxxxxxxxx>
> Sent: Wednesday, July 21, 2004 6:02 PM
> Subject: {Collins} Fwd: Re: 6146B Neutralization technique
>
>
> >
> > -- Attached file included as plaintext by Ecartis --
> >
> > X-WebTV-Signature: 1
> > ETAtAhR0ABFHxS4ErPdck26bP0RcX66ULgIVAKlfFrOmbLD6ayMsoQ3wo2SLVwBy
> > From: ronaldron@xxxxxxxxx (Ronald Mott)
> > Date: Wed, 21 Jul 2004 06:04:15 -0500
> > To: gmcalmo@xxxxxxxxxxxx, collins-bounce@xxxxxxxxxxxxxxxxxxxxx
> > Subject: Re: {Collins} 6146B Neutralization technique
> > Message-ID: <25178-40FE4DAF-2@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
> > In-Reply-To: Gene McCalmont <gmcalmo@xxxxxxxxxxxx>'s message of Tue,
> 20
> Jul
> > 2004 20:31:34 -0500
> > Content-Disposition: Inline
> > Content-Type: Text/Plain; Charset=US-ASCII
> > Content-Transfer-Encoding: 7Bit
> > MIME-Version: 1.0 (WebTV)
> >
> > Hi GENE                                                    You might
> > just try nurtralizing the 6ah6 driver circit per your book as you
> didnt
> > replace output tubes.
> > As for the peak power at plate current dip has always been my final
> test
> > for correct neutralization.
> >
> >
> >
> >
> >
> >
> > Sponsored by the Collins Collectors Association
> http://www.collinsradio.org
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>
>
> Sponsored by the Collins Collectors Association
> http://www.collinsradio.org
> Nets: Tues: 3.805 Mc-2000 Central / Thur: 3.875 Mc-2000 Central
> Fri: 3.895 Mc-2000 Pacific / Sun: 14.263 Mc-2000 UTC
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> Sun AM Net: 29.050 Mc-1200 Central
>
>
> Sponsored by the Collins Collectors Association
> http://www.collinsradio.org
> Nets: Tues: 3.805 Mc-2000 Central / Thur: 3.875 Mc-2000 Central
> Fri: 3.895 Mc-2000 Pacific / Sun: 14.263 Mc-2000 UTC
> 1st Wed (of the month) AM Net 3.880 Mc-2000 local (ET, CT, MT, PT)
> Sun AM Net: 29.050 Mc-1200 Central
>
>
> Sponsored by the Collins Collectors Association
http://www.collinsradio.org
> Nets: Tues: 3.805 Mc-2000 Central / Thur: 3.875 Mc-2000 Central
> Fri: 3.895 Mc-2000 Pacific / Sun: 14.263 Mc-2000 UTC
> 1st Wed (of the month) AM Net 3.880 Mc-2000 local (ET, CT, MT, PT)
> Sun AM Net: 29.050 Mc-1200 Central
>

Sponsored by the Collins Collectors Association http://www.collinsradio.org
Nets: Tues: 3.805 Mc-2000 Central / Thur: 3.875 Mc-2000 Central
Fri: 3.895 Mc-2000 Pacific / Sun: 14.263 Mc-2000 UTC
1st Wed (of the month) AM Net 3.880 Mc-2000 local (ET, CT, MT, PT)
Sun AM Net: 29.050 Mc-1200 Central






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