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Model 89 "Progress" Different coil issue?
#1

Hi all,
I rewound the osc coil per Ron's instructions. The set still has the same symptoms.
Basically, it will tune from about 1500kc down to 1000kc, then stop receiving. It is not the tuning cap plates.
The OSC coil rewind did not change any of the previous symptoms.

(I am using the diagram using the 36 tube, although the set is a code (123) EVerything else matches up to it.)

First, here may be a clue. When I remove the grid cap from the #36 tube (Osc) the set will rceive, weakly to the low side of the band.
Upon reattaching the grid cap the set will be silent at the low freqs.

Another thing. When the set is aligned, then I am peaking the set at about 1400, it seems ok, But the n if you make a static or something like click the soldering iron, the set will squeal. Tuning lower will make the squeal sometimes stop, then you can tune back up the band. All seems well, but if there is a loud station or static click, the set will oscillate again.

======================================================
OK, moving to the next coil, I was checking the Ohms on the coupling coil (part 6) between the 35/44 Rf tube, and the 36 tube. The primary shows the correct Ohms, just about 1.6 Ohms.

The secondary shows 0 Ohms, like a shot circuit. It is supposed to be about 9.76 Ohms.

Removed the coil, and seen that someone has probably rewound the outer winding. Scotch tape, and bad soldering.

Now, here are the questions.

Does this look like the right gauge wire for this winding? Sort of looks heavy.

There is a remnant of a thinner wire on one of the rewound terminals. Perhaps this is the correct gauge to use?

Last, as the winding shows zero Ohms , I suspect a thinner wire will show the 9.76 Ohms is is supposed to be.

Guys, can someone either show me a coil, or let me know what the outer winding on this is supposed to be?

Here are the photos, and thanks in advance.
Gary.

[Image: http://antiqueradios.com/gallery/d/91537-1/coil1.JPG]

[Image: http://antiqueradios.com/gallery/d/91539-1/coil2.JPG]
(Here you can see the tap in the primary)
[Image: http://antiqueradios.com/gallery/d/91541-1/coil3.JPG]

[Image: http://antiqueradios.com/gallery/d/91543-1/coil4.JPG]


Messages In This Thread
Model 89 "Progress" Different coil issue? - by gary rabbitt - 08-20-2009, 10:11 PM



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