Coronado Model 1682

10/9/2000 3:28:32 PMJoseph Mollen

I am working on fixing up a Coronado Model 1682 radio.
I have recently finished replacing most of the
capacitors, the power cord and one of the vacuum tubes.
Currently the radio is working but does not work well.

I am using a wire as a makeshift antenna. The scematic
diagram for the radio shows that there is a "loop" of
unspecified length, attached to a capacitor and then
to the antenna. These parts were missing from my radio
when I got it. I am not sure how to create a
replacement loop without more details. I also am not
sure what the original antenna would have looked like.
There is no back on my radio and I am not sure if there
ever was one.

The schematic given on this web page for the 1682
isn't complete and doesn't show the loop, but anyone
with an original copy can probably see the part I am
talking about.

Also....when I turn the tuning capacitor to the lower
half of the dial I get a lot of crackling and pops.
The quality seems to get worse as the plates of the
tuning capacitor are in closer alignment (with larger
capacitive area). Is there any way to cure this? Do
I need to replace the tuning capacitor?

Any help would be appreciated.

Thank you,
Joseph Mollen

10/9/2000 4:02:37 PMNorm Leal

Hi Joseph

A loop is more than an antenna. It's a tuned circuit and is part of the antenna coil.. Without the loop signals will be weak.

The crackling you hear while tuning are plates of the tuner touching. Look carefully and bend them slightly so they don't touch.

I'll send the schematic.

Norm

: I am working on fixing up a Coronado Model 1682 radio.
: I have recently finished replacing most of the
: capacitors, the power cord and one of the vacuum tubes.
: Currently the radio is working but does not work well.

: I am using a wire as a makeshift antenna. The scematic
: diagram for the radio shows that there is a "loop" of
: unspecified length, attached to a capacitor and then
: to the antenna. These parts were missing from my radio
: when I got it. I am not sure how to create a
: replacement loop without more details. I also am not
: sure what the original antenna would have looked like.
: There is no back on my radio and I am not sure if there
: ever was one.

: The schematic given on this web page for the 1682
: isn't complete and doesn't show the loop, but anyone
: with an original copy can probably see the part I am
: talking about.

: Also....when I turn the tuning capacitor to the lower
: half of the dial I get a lot of crackling and pops.
: The quality seems to get worse as the plates of the
: tuning capacitor are in closer alignment (with larger
: capacitive area). Is there any way to cure this? Do
: I need to replace the tuning capacitor?

: Any help would be appreciated.

: Thank you,
: Joseph Mollen

10/27/2000 2:49:51 PMJoseph Mollen

Does anyone know where I could buy a replacement
3 section variable plate capacitor? Trying to find
the problems with mine and align the plates seems to
be a task that is beyond me....the plates are
incredibly close together and it is difficult to find
which are touching. Even trying to adjust a plate is
as likely to introduce a new problem as bad as the one
I would try to fix. This is not a by-inspection
problem; it is difficult to see the gap on either side
of a plate even with a magnifying glass and a well
aligned plate.

-Joe

: Hi Joseph

: A loop is more than an antenna. It's a tuned circuit and is part of the antenna coil.. Without the loop signals will be weak.

: The crackling you hear while tuning are plates of the tuner touching. Look carefully and bend them slightly so they don't touch.

: I'll send the schematic.

: Norm
:

: : I am working on fixing up a Coronado Model 1682 radio.
: : I have recently finished replacing most of the
: : capacitors, the power cord and one of the vacuum tubes.
: : Currently the radio is working but does not work well.

: : I am using a wire as a makeshift antenna. The scematic
: : diagram for the radio shows that there is a "loop" of
: : unspecified length, attached to a capacitor and then
: : to the antenna. These parts were missing from my radio
: : when I got it. I am not sure how to create a
: : replacement loop without more details. I also am not
: : sure what the original antenna would have looked like.
: : There is no back on my radio and I am not sure if there
: : ever was one.

: : The schematic given on this web page for the 1682
: : isn't complete and doesn't show the loop, but anyone
: : with an original copy can probably see the part I am
: : talking about.

: : Also....when I turn the tuning capacitor to the lower
: : half of the dial I get a lot of crackling and pops.
: : The quality seems to get worse as the plates of the
: : tuning capacitor are in closer alignment (with larger
: : capacitive area). Is there any way to cure this? Do
: : I need to replace the tuning capacitor?

: : Any help would be appreciated.

: : Thank you,
: : Joseph Mollen

3/2/2001 5:16:03 PMLarry Bartscher