Still working on this unit ( The 240/110 volt saga ). I have it working now ( 110v ) but not very well. The main problem was, apart from all the resistors and caps faulty, that the oscillator coil on the b/c band was open circuit. I very carefully removed it, saw where the corrosion was, and realized the only solution was to unwind it and then rewind it. I thought that I did a pretty good job, measuring the lenght and gauge but alas as always it's not quite spot on. All the staions are about 20-30 khz off even with the padder adjustment. I have 2 options , one is to rewind it to give it more inductance and two ask if anyone would have one for sale. So if anyone one has a number 3 coil for sale please let me know.
Regards Rudy
:Hello everyone,
:Still working on this unit ( The 240/110 volt saga ). I have it working now ( 110v ) but not very well. The main problem was, apart from all the resistors and caps faulty, that the oscillator coil on the b/c band was open circuit. I very carefully removed it, saw where the corrosion was, and realized the only solution was to unwind it and then rewind it. I thought that I did a pretty good job, measuring the lenght and gauge but alas as always it's not quite spot on. All the staions are about 20-30 khz off even with the padder adjustment. I have 2 options , one is to rewind it to give it more inductance and two ask if anyone would have one for sale. So if anyone one has a number 3 coil for sale please let me know.
:Regards Rudy
Rudy again, Sorry about the typos, no matter how many times I check I always make a boo boo. Please forgive.
:
It's not the length or gauge of wire that's most important but rather number of turns. When a coil is rewound a length of wire will give fewer turns. Hard to get turns back as neat.
You may find a similar replacement coil here:
http://www.oldradioparts.com/2a6fla.txt
AES, www.tubesandmore.com sells replacement universal oscillator coils. These coils have a center metal adjustment so they can match just about any broadcast band oscillator coil.
Norm
:
::Hello everyone,
::Still working on this unit ( The 240/110 volt saga ). I have it working now ( 110v ) but not very well. The main problem was, apart from all the resistors and caps faulty, that the oscillator coil on the b/c band was open circuit. I very carefully removed it, saw where the corrosion was, and realized the only solution was to unwind it and then rewind it. I thought that I did a pretty good job, measuring the lenght and gauge but alas as always it's not quite spot on. All the staions are about 20-30 khz off even with the padder adjustment. I have 2 options , one is to rewind it to give it more inductance and two ask if anyone would have one for sale. So if anyone one has a number 3 coil for sale please let me know.
::Regards Rudy
:
:
:
:
:Rudy again, Sorry about the typos, no matter how many times I check I always make a boo boo. Please forgive.
::
:
: It's not the length or gauge of wire that's most important but rather number of turns. When a coil is rewound a length of wire will give fewer turns. Hard to get turns back as neat.
:
: You may find a similar replacement coil here:
:
:http://www.oldradioparts.com/2a6fla.txt
:
: AES, www.tubesandmore.com sells replacement universal oscillator coils. These coils have a center metal adjustment so they can match just about any broadcast band oscillator coil.
:
:Norm
:
:Thanks for your reply Norm, I have bookmarked both sites and will study them later tonight.
When I measured and rewound the coil ( very carefully ) I thought that I would end with the same number of turns but apparently not. Might give it another go once the bread & butter work slows down.
Rudy
:
:
::
:::Hello everyone,
:::Still working on this unit ( The 240/110 volt saga ). I have it working now ( 110v ) but not very well. The main problem was, apart from all the resistors and caps faulty, that the oscillator coil on the b/c band was open circuit. I very carefully removed it, saw where the corrosion was, and realized the only solution was to unwind it and then rewind it. I thought that I did a pretty good job, measuring the lenght and gauge but alas as always it's not quite spot on. All the staions are about 20-30 khz off even with the padder adjustment. I have 2 options , one is to rewind it to give it more inductance and two ask if anyone would have one for sale. So if anyone one has a number 3 coil for sale please let me know.
:::Regards Rudy
::
::
::
::
::Rudy again, Sorry about the typos, no matter how many times I check I always make a boo boo. Please forgive.
:::
AHHHHHH...yessss...you are in luck .... ve 'chust done been gettink in und fresh shipment this mornink.....(using my best Katzenjammer
Kids-esque reponse)....... Und vould you be wantink vit der clocking-wise or counter-clocking-wise woundink coil ?
"I thought that I did a pretty good job, measuring the lenght(sp) and gauge but alas as always it's not quite spot on. All the staions are about 20-30 khz off even with the padder adjustment." "one is to rewind it to give it more inductance "
Thank goodness that you correctly analyzed and gave us enough supplemental info there !!!!!
"I have 2 options" ......au contraire ...... you have yet one another option, and precisely the one that I would definitely opt for and that would be the inclusion of a slug within the center core of that rewound coil. That will skew its inductive value up enough to easily come within your required range.
Better yet, lets now say that it can be set PRECISELY for the required value..not an option on that original air cored unit I'll bet !
Now I am not cognizant as to whether your original coil form that you are using is one of the old generation 1/2 to 3/4 in diameter kluges or one of the later generation 3/8 or 1/4 in diameter forms. In either case its just a matter of incorporating an adjustable slug centered within the old coil forms inner axis.
The uninitiated typically just adjusts the oscillator padder for the low band reception combining its adjunct trade off on dial scale calibration and the ant padder adjustment is then peaked for optimal high band reception. I like to further fine tune that into FOUR separate tracking adjustments. .
Being that discriminating on my alignment tracking of a receiver, I will be wanting to additionally have full adjustment on the inductive value of the
RF loop and oscillator sections . My procedure there is the inclusion of a small adj series inductor in the antenna loop circuit OR the side skewing of inner windings of a wound loop if that is mechanically possible. Or, if so new as to be incorporating a ferrite loop, the rewinding of that coil onto a movable form such that its final inductive value can then have it positioned ~1/4 from an end and then be fine tuned in on its final positioning with wax holding its final positioning.
VERY frequently osc coils are solely on air cores, so I merely skew off some of the resonating windings outer turns such as to DECREASE its inductance...such as you are ALREADY experiencing.....and then reach in the junque box and get a cardboard coil form with its molded / pressed internal formed threading that is nestling a 1'4 in threaded slug with its hex center hole.
An initial frequency test is made with the effective form diameter increased with tissue paper until it centers within the larger form, that then lets me roughly reposition it while testing the receiver to see if proper tuning is accomplished with the core positioned just outside of the center axis of the COILS WINDING WIDTH. That will than permit that final precise adjustment of inductance that I mentioned. Once I eyeball the physical
location requirements, the tissue paper is discarded and I build up the new cardboard forms outer diameter using thin cardboard until it just makes a sliding internal fit into the original coil form. Final anchoring being done with melted paraffin / candle wax or hot glue. As either will permit
future positional tweaking by heating if ever required...glues not forgiving in that manner.
I have used old generation IF transformer slugs with their encompassing forms, old tube vintage TV's with 4.5 Mhz IF and interstage slugs with their surrounding forms, or even the slugs from the hoz circuitry and their coil forms with the massive winding skewed off and discarded with those larger slugs still being within proper inductive value for BC Band use.
If you are up against the wall on coming up with that slug and its form inform me.
Thassit
73's de Edd
::Hi Rudy
::
:: It's not the length or gauge of wire that's most important but rather number of turns. When a coil is rewound a length of wire will give fewer turns. Hard to get turns back as neat.
::
:: You may find a similar replacement coil here:
::
::http://www.oldradioparts.com/2a6fla.txt
::
:: AES, www.tubesandmore.com sells replacement universal oscillator coils. These coils have a center metal adjustment so they can match just about any broadcast band oscillator coil.
::
::Norm
::
::Thanks for your reply Norm, I have bookmarked both sites and will study them later tonight.
:When I measured and rewound the coil ( very carefully ) I thought that I would end with the same number of turns but apparently not. Might give it another go once the bread & butter work slows down.
:Rudy
::
::
:::
::::Hello everyone,
::::Still working on this unit ( The 240/110 volt saga ). I have it working now ( 110v ) but not very well. The main problem was, apart from all the resistors and caps faulty, that the oscillator coil on the b/c band was open circuit. I very carefully removed it, saw where the corrosion was, and realized the only solution was to unwind it and then rewind it. I thought that I did a pretty good job, measuring the lenght and gauge but alas as always it's not quite spot on. All the staions are about 20-30 khz off even with the padder adjustment. I have 2 options , one is to rewind it to give it more inductance and two ask if anyone would have one for sale. So if anyone one has a number 3 coil for sale please let me know.
::::Regards Rudy
:::
:::
:::
:::
:::Rudy again, Sorry about the typos, no matter how many times I check I always make a boo boo. Please forgive.
::::
:
: It's not the length or gauge of wire that's most important but rather number of turns. When a coil is rewound a length of wire will give fewer turns. Hard to get turns back as neat.
:
: You may find a similar replacement coil here:
:
:http://www.oldradioparts.com/2a6fla.txt
:
: AES, www.tubesandmore.com sells replacement universal oscillator coils. These coils have a center metal adjustment so they can match just about any broadcast band oscillator coil.
:
:Norm
:
:
:
:
::
:::Hello everyone,
:::Still working on this unit ( The 240/110 volt saga ). I have it working now ( 110v ) but not very well. The main problem was, apart from all the resistors and caps faulty, that the oscillator coil on the b/c band was open circuit. I very carefully removed it, saw where the corrosion was, and realized the only solution was to unwind it and then rewind it. I thought that I did a pretty good job, measuring the lenght and gauge but alas as always it's not quite spot on. All the staions are about 20-30 khz off even with the padder adjustment. I have 2 options , one is to rewind it to give it more inductance and two ask if anyone would have one for sale. So if anyone one has a number 3 coil for sale please let me know.
:::Regards Rudy
::
::
::
::
::Rudy again, Sorry about the typos, no matter how many times I check I always make a boo boo. Please forgive.
:::
Norm, I just had a look at tubesandmore and unfortunately their universal osc. coil is for broadcast only, whereas the zenith, if you check the circuit has police/s.w and b/c. incorporated.
Rudy