01-24-2013, 10:35 PM
Hello
First off thanks to everyone who help me last year with my slew of radios. The gifts were delivered for Christmas and they were a big hit !
I have a 1948 model 48-200 that I am working on. I need some help fine tuning the set.
Some background. I purchased this set from a repair person in Delaware who did much of my recapping last year. I only purchased the chassis. I have since found a case, but alas there is no antenna. The set has been recapped and also has been aligned by Radiotiques.
In looking around the web, I stumbled across a link to make a homemade loop antenna for these type of radios.
http://antiqueradios.com/forums/viewtopi...&highlight=
I followed the instructions and my results are shown in the image below. I used 28 gage wire which I purchase from Radio Daze. (http://www.radiodaze.com/product/13594.aspx )
One other complicating factor. Although the radio was purchased in about 2 months ago, I only had the opportunity to open it up the other day. I discovered that the speaker cone had been ripped during shipping. I repaired the cone using a techique found on this forum using glue and tea bags and the result is also shown.
I also have not checked to see if any tubes are weak.
Now the problem. I can tune stations in, but they are not sharp. Now to me if this were a "speaker" problem (because of the repaired cone), I would expect buzzing but not a lack of sharpness.
I also know that getting the antenna right, is very important. I have created a circumerence the same as the inside of the radio and have 17 loops. I tried counting the number of loops for a 48-200 and 46-200. Can anyone tell me how sensitive this is . If I am over or under by a loop or two, would this cause some distortion ?
What other things can I check for (I will test the tubes). Do I need to try to re-align (I have a signal generator).
I am going to try very hard to trouble shoot (and hopefully solve) this with the phorums help.
As always suggestions are welcome.
First off thanks to everyone who help me last year with my slew of radios. The gifts were delivered for Christmas and they were a big hit !
I have a 1948 model 48-200 that I am working on. I need some help fine tuning the set.
Some background. I purchased this set from a repair person in Delaware who did much of my recapping last year. I only purchased the chassis. I have since found a case, but alas there is no antenna. The set has been recapped and also has been aligned by Radiotiques.
In looking around the web, I stumbled across a link to make a homemade loop antenna for these type of radios.
http://antiqueradios.com/forums/viewtopi...&highlight=
I followed the instructions and my results are shown in the image below. I used 28 gage wire which I purchase from Radio Daze. (http://www.radiodaze.com/product/13594.aspx )
One other complicating factor. Although the radio was purchased in about 2 months ago, I only had the opportunity to open it up the other day. I discovered that the speaker cone had been ripped during shipping. I repaired the cone using a techique found on this forum using glue and tea bags and the result is also shown.
I also have not checked to see if any tubes are weak.
Now the problem. I can tune stations in, but they are not sharp. Now to me if this were a "speaker" problem (because of the repaired cone), I would expect buzzing but not a lack of sharpness.
I also know that getting the antenna right, is very important. I have created a circumerence the same as the inside of the radio and have 17 loops. I tried counting the number of loops for a 48-200 and 46-200. Can anyone tell me how sensitive this is . If I am over or under by a loop or two, would this cause some distortion ?
What other things can I check for (I will test the tubes). Do I need to try to re-align (I have a signal generator).
I am going to try very hard to trouble shoot (and hopefully solve) this with the phorums help.
As always suggestions are welcome.
