[NJARC] speaking of microscopes......

[David Sica]

I got one of those a while back, primarily to examine record grooves, a) to
evaluate the effectiveness of ultrasonic cleaning, and b) to help set the
proper stylus cut depth if and when I ever get my Presto record lathe
restored.  It's a really cheap piece of cr at p (very difficult to set focus,
noise in the image and low resolution) but overall it works surprisingly
well (well enough for many things we'd need to do) and it takes photos and
video. Twelve bucks, including shipping, from china.

 [image: Inline image 4][image: Inline image 2][image: Inline image 3][image:
Inline image 1]

-- Dave Sica

On Wed, Mar 22, 2017 at 9:46 PM, Bill Zukowski <n2yeg at optonline.net> wrote:

> Just remember
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> Reply All = Everyone
>
> _________________________________________________________
>
> From April QST.
>
> Bill Zukowski
>
> On 3/22/2017 7:40 PM, Pete O via NJARC wrote:
>
> Just remember
> Reply = Poster
> Reply All = Everyone
>
> _________________________________________________________
>
>
>
> It's been my experience that the break in those Philco coils is where the
> outer winding makes a 90 degree bend and then down to the solder lug.  If
> it is this outer winding, carefully lift it up out of the wax until you get
> to the bend. It's part of the coil winding process that puts strain on the
> bend. Removing that one turn won't hurt anything. A stereo microscope
> really helps along with some dental tools.
>
> If you are really desperate, you can send the coil to me and I'll check it
> out under the microscope. No guarantees though.
>
> Pete Olin
>
>
> ------------------------------
> *From:* TrainBee via NJARC <njarc at mailman.qth.net> <njarc at mailman.qth.net>
> *To:* njarc at mailman.qth.net
> *Sent:* Wednesday, March 22, 2017 5:28 PM
> *Subject:* [NJARC] Philco 60 Antenna Coil - Open
>
> Does anyone have any experience with rewinding an Antenna Coil (IF) for a
> Philco 60?  How about another Philco of similar vintage? I have one that
> has an open winding between terminals 2 and 3.  If not, have you ever
> rewound a coil and could give some advise?  I'm pretty sure I have the
> problem narrowed down.  There is no signal generated by the LO and no
> voltage readings from either terminal 2 or 3.  The ohms readings between
> the top lug and # 4 isn't close, but at least there is something.  I'm also
> getting a reading between terminals 1 and 6. Once again, it's not close to
> the schematic.
>
> I'd prefer to not rewind the entire coil.  But, if in your experience,
> this is what's needed, then I'll give it a try.  I've seen the info on Ron
> Ramirez's site and I'm hoping I can get some more shared experience from
> our members.  The Philco 60 I am working on is from the Sept. 1934
> production run.  It incorporated quite a few of the improvements that
> Philco had for this radio.
>
> Thanks in advance for your help.
>
> Joe Devonshire
>
>
> Just remember
> Reply = Poster
> Reply All = Everyone
>
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