Airline Rudolph 05gcb-1540
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Airline Rudolph 05gcb-1540
I have recapped the electrolytics in this radio. At first I had no audio, then I jumpered it to another radios speaker/transformer, then I got a low hum. It has a resistor looking part that I think is a cap. Should I change it out? The tubes are hard to get to to check voltages. The transformer did show like 1.875k on the input and almost zero on the output, tested still in radio. Thanks


Rickey- Member

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Age: 57
Registration date: 2011-09-06
Re: Airline Rudolph 05gcb-1540
Here is a better view of the big "resistor"!


Rickey- Member

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Age: 57
Registration date: 2011-09-06
Re: Airline Rudolph 05gcb-1540
Thats a resistor 47 ohm 2 watt
http://sparks-radio-shack.forumotion.com/t144-rudolph-airline-05gcb-1540
http://sparks-radio-shack.forumotion.com/t144-rudolph-airline-05gcb-1540
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Re: Airline Rudolph 05gcb-1540
Thanks RIF, it's a whopper!
Rickey- Member

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Registration date: 2011-09-06
Re: Airline Rudolph 05gcb-1540
I put another transformer on it and replaced all the other caps. I think the one that got the audio tranny was the mica mold! It's singing like a bird now! I mean a reindeer!
Thanks, I truly love the forum!
Thanks, I truly love the forum!
Rickey- Member

- Number of posts: 36
Age: 57
Registration date: 2011-09-06
Re: Airline Rudolph 05gcb-1540
Here it is recapped


Rickey- Member

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Age: 57
Registration date: 2011-09-06
Re: Airline Rudolph 05gcb-1540
Here are the bad guys!

Rickey- Member

- Number of posts: 36
Age: 57
Registration date: 2011-09-06
Re: Airline Rudolph 05gcb-1540
Congradulations on a job well done!
You need to replace all bad caps before you even attempt to fire up a radio. Alot of radios also used rubber wiring, which is also often bad. Another reason to restore before plugging in.
I doubt the mica mold cap took the transformer, though.
Alot of the cheaper transformers tended to go bad on their own.
Bill Cahill
You need to replace all bad caps before you even attempt to fire up a radio. Alot of radios also used rubber wiring, which is also often bad. Another reason to restore before plugging in.
I doubt the mica mold cap took the transformer, though.
Alot of the cheaper transformers tended to go bad on their own.
Bill Cahill
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Re: Airline Rudolph 05gcb-1540
Thanks Bill, more to follow!
Rickey- Member

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Registration date: 2011-09-06
Re: Airline Rudolph 05gcb-1540
After a couple of days I get distortion on this set.Now i have some voltages. The cathode on the 50c5 reads 5 volts dc. The cathode resistor reads 190, a little out of the 20 percent range, should be 150. I get low positive voltage on the grid pin ,1.2 volts. I should be on dc, correct? The radio improves vastly when i check the voltage on the cathode!
Rickey
Rickey
Rickey- Member

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Re: Airline Rudolph 05gcb-1540
the resistors are beyond 20 percent in a couple of cases(30) percent.
Resistor 3 should be a 10 meg and it reads 17 meg! its on the 12at6 on pins 1 and 2, grid and cathode. I ordered a few resistors from mouser, but i dont think i ordered the 10 meg.Would this resistor cause distortion?
Thanks,Rickey
Resistor 3 should be a 10 meg and it reads 17 meg! its on the 12at6 on pins 1 and 2, grid and cathode. I ordered a few resistors from mouser, but i dont think i ordered the 10 meg.Would this resistor cause distortion?
Thanks,Rickey
Rickey- Member

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Re: Airline Rudolph 05gcb-1540
I don't know what you mean by distortion, but, it would cause issues with sensitivity.
Bill Cahill
Bill Cahill
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Re: Airline Rudolph 05gcb-1540
The radio sounds like a bad filter capacitor, but they are ok!
Rickey
Rickey
Rickey- Member

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Re: Airline Rudolph 05gcb-1540
Also, on pin 2 of 50C5 you should get low negative, or 0 volts. That's usually a bad coupling cap from plate of pre amp to 50C5. Replacement is mandetory.
Don't leave any original paper caps in it.
Bill Cahill
Don't leave any original paper caps in it.
Bill Cahill
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Re: Airline Rudolph 05gcb-1540
All caps were changed to begin with. I get very low positive volts on pin 2. The audio tube gets hotter than a 2 dollar pistol! The dial light glows very dim also?
Thanks
Thanks
Rickey- Member

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