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Emerson EC-301 - Printable Version

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Emerson EC-301 - vecher - 02-07-2019

Ok started on this  Thought it would be straight forward  BUT...

[Image: https://farm5.staticflickr.com/4916/47022826601_ea82bce293_b.jpg]


Here is underside.. Looks like all caps were replaced at some time..

[Image: https://farm8.staticflickr.com/7823/46298891434_8db5d0814d_b.jpg]


Chassis parts do not seem to follow schematic..

More to follow.. Have to copy schematic to download..

Skip

RE: Emerson EC-301 - vecher - 02-07-2019

Ok, Here is what I have.. seems power supply section has 2 additional resistors added..

1st picture is schematic I have..

[Image: https://farm8.staticflickr.com/7913/47023239371_2c5ac50569_b.jpg]

Next picture is what is really there..

[Image: https://farm8.staticflickr.com/7807/47023239601_877a77c1e6_b.jpg]


These look like factory installed.. But cannot be sure

Other problem is F/C I think speaker and F/C were changed..

Thoughts??

Skip

RE: Emerson EC-301 - Arran - 02-08-2019

The first resistor is a surge resistor, some sets have them in series with the rectifier plate, and some do not, but most likely it is original. The 200 K resistor should be paralleled with a .2 uf cap, it's there to couple the B- to the chassis for shielding purposes, I don't know how critical it is as, again, some sets have them, others do not, either way the big paper cap is needed or the set will motorboat like crazy.
Regards
Arran

RE: Emerson EC-301 - vecher - 02-08-2019

Seems the more I look into this .. They or who ever Replaced most of the caps with different values.. Found some .05 replaced with .10 found 2 .0002 replaced with .0005 It keeps getting better and better..

Skip

RE: Emerson EC-301 - vecher - 02-08-2019

OK Ps the filter caps were 70UF and 20UF..

Maybe due to the F/C being 1092 Ohms..

Who Knows..


Skip

RE: Emerson EC-301 - vecher - 02-10-2019

Ok I replaced the Electrolytic with the same value as was in it.

Then I powered it up.. I do not normally do power up until I replace all caps and out of tolerance resistors But since this seems to have so many different values in it that's not on schematic.. I figured why NOT..

It lives!! Surprisingly it works pretty good.. But now I an replace with the values that are in it or as close as I can get.

Skip

RE: Emerson EC-301 - Paul Philco322 - 02-10-2019

Some of those little Emersons play pretty well, some not so much. They may have had the small but "pretty good" thing sown pat.

Paul

RE: Emerson EC-301 - vecher - 02-10-2019

Well, I found a wire not connected from the loop antenna it was supposed to go to ground. When connected it played much better.. But now on to the Recap..

Skip

RE: Emerson EC-301 - vecher - 02-12-2019

Recapped and aligned radio.. Works great now

[Image: https://farm8.staticflickr.com/7927/47075858021_38541e8d6c_b.jpg]

Cleaned up with a little Go-Jo and it looks pretty good..

Skip

RE: Emerson EC-301 - Paul Philco322 - 02-12-2019

Pretty cool dial too, nice job!

Paul

RE: Emerson EC-301 - vecher - 02-12-2019

Thanks.. I have to work on case a little more.. But radio plays great..

Skip