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 Post subject: Re: rogers majestic r-841
PostPosted: Dec Thu 07, 2017 11:51 pm 
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That looks like a quad cap, or two individual twin caps which, like the wiring on it is cactus. If you look at the schematic there are four in the RF & that's likely them. The decision is now to re-stuff, or use tag strip I normally shield modern caps in close proximity in a tin box, within the box: Compartmentalize

Tie the groups together before removing them and only replace the wires in those groups; group by individual group as you assign them to a new cap. Removing the can content will reveal what is in it.

Marc


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 Post subject: Re: rogers majestic r-841
PostPosted: Dec Thu 07, 2017 11:54 pm 
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Sorry it do not make sense to me .


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 Post subject: Re: rogers majestic r-841
PostPosted: Dec Fri 08, 2017 12:49 am 
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Here is a section of the schematic showing all the capacitors that might be in one of those two cans--or in another one somewhere.
Attachment:
caps.jpg
caps.jpg [ 129 KiB | Viewed 141 times ]

What you need to do is trace the wiring from each terminal on the cans, and see where it goes. Identify each on in terms of a functional description---eg the cathode of the IF tube, etc. You'll need to look up those tubes to get the pin numbering.

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 Post subject: Re: rogers majestic r-841
PostPosted: Dec Fri 08, 2017 1:22 am 
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Thanks Pixellany I will work on this over the next few days.


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 Post subject: Re: rogers majestic r-841
PostPosted: Dec Fri 08, 2017 7:17 pm 
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I looked at it and it seems to be to me that there are 13 connection points on 3 capacitor blocks which makes a total of 13 capacitors. So does everyone of these point go to chassis ground or does it have to be restuffed like it is now.


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 Post subject: Re: rogers majestic r-841
PostPosted: Dec Fri 08, 2017 7:57 pm 
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The schematic I posted has 14 capacitors circled. They all have the same symbol, and also are in a range of values that I would expect to find in one of those cans. I suggest that you find the one that is not on your list of 13.

On the schematic that I posted, do you see the ground symbol at the bottom of each capacitor circled?

The typical construction of those cans is to ground one end of all the caps to the case.

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 Post subject: Re: rogers majestic r-841
PostPosted: Dec Fri 08, 2017 10:17 pm 
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So is it best to eliminate the can or restuff it and how do you clean out the can. Also yes I see the chassis ground symbol .


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 Post subject: Re: rogers majestic r-841
PostPosted: Dec Sat 09, 2017 1:41 pm 
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I normally restuff those cans.....to preserve the wiring layout, shielding, etc. if you just use a bunch of discrete parts, you could have stability issues.

To remove the contents. I use my hot plate and hot air gun to melt the tar.

Be sure to ID cap #14, and label all wires before proceeding.

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 Post subject: Re: rogers majestic r-841
PostPosted: Dec Sat 09, 2017 6:26 pm 
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The first wire I tried to trace leaves a 2mfd marked can and goes to resistor bar and then goes to pin 1 of speaker plug, so is it a 2 mf d electrolytic.


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 Post subject: Re: rogers majestic r-841
PostPosted: Dec Sat 09, 2017 7:11 pm 
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Also can some one tell me what does red r.c.c. and red t.c. mean , I know red is wire color but not sure the other letters.


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 Post subject: Re: rogers majestic r-841
PostPosted: Dec Sat 09, 2017 7:37 pm 
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It just is amazing that there is so much knowledge on this site but so little help.


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 Post subject: Re: rogers majestic r-841
PostPosted: Dec Sat 09, 2017 7:47 pm 
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spsquires wrote:
The first wire I tried to trace leaves a 2mfd marked can and goes to resistor bar and then goes to pin 1 of speaker plug, so is it a 2 mf d electrolytic.

In very early radios, the filters were not electrolytic. As far as I know, the typical potted assemblies were not electrolytic. For the filters, you can use regular film or electrolytic. Many people suggest NOT putting electrolytics in potted assemblies

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 Post subject: Re: rogers majestic r-841
PostPosted: Dec Sat 09, 2017 7:48 pm 
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spsquires wrote:
Also can some one tell me what does red r.c.c. and red t.c. mean , I know red is wire color but not sure the other letters.

There is a note on the schematic explaining those codes.

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 Post subject: Re: rogers majestic r-841
PostPosted: Dec Sat 09, 2017 7:50 pm 
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ALL I have is electrolytics and the answer to my other question , what does r.c.c and t.c on wire colors.


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 Post subject: Re: rogers majestic r-841
PostPosted: Dec Sat 09, 2017 7:52 pm 
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spsquires wrote:
It just is amazing that there is so much knowledge on this site but so little help.

Wow!!
based on your experience with people, would you expect a comment like that to result in more help...or less?

How many current threads are there where no one has tried to help?

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 Post subject: Re: rogers majestic r-841
PostPosted: Dec Sat 09, 2017 7:54 pm 
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Found the note but do not see any thing for t.c.


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 Post subject: Re: rogers majestic r-841
PostPosted: Dec Sat 09, 2017 7:59 pm 
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spsquires wrote:
Found the note but do not see any thing for t.c.

T=tracer maybe? This may not be important to trace the wires.....

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 Post subject: Re: rogers majestic r-841
PostPosted: Dec Sat 09, 2017 8:01 pm 
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None where no one has helped but it is always the same few people but there are so many who just watch and do not help.Ihave followed many of my forums and people of great knowledge just watch.


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 Post subject: Re: rogers majestic r-841
PostPosted: Dec Sat 09, 2017 8:04 pm 
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pixellany wrote:
(repeat)
based on your experience with people, would you expect a comment like that to result in more help...or less?

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"It's always something". --Gilda Radner (1946 - 1989)


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 Post subject: Re: rogers majestic r-841
PostPosted: Dec Sat 09, 2017 8:08 pm 
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Well I guess it is not going to change for me either way because I have only got help from the same few and I can not get better in this field has people would like me to be if some one does not try to help.So I gues it is a catch 22 for me.


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