Author |
Message |
Radiosmoker
|
Post subject: Re: PAPER CAPACITOR VALUES Posted: Nov Fri 15, 2019 2:43 am |
|
Member |
 |
Joined: Oct Thu 18, 2007 11:34 am Posts: 4177 Location: Port Orchard, Wa 98366
|
devilsmist wrote: pixellany wrote: mfd is an obsolete from---as is mmfd (meaning micro-micro Farad. What do you mean obsolete  That is what I learned and what I still use. DM What they mean is, to be correct when it comes to electronic parts, if it has the obsolete markings on it, you are not supposed to use them even if they are still good. Old methods are no longer used because everyone has to be on the same page (so to speak) don't you know? I AM NOW IN CONTROL, I ADJUST THE Vertical and HORIZONTAL! MU-HAHA!!!
_________________ Visit our site: http://antique-radio-lab.forumotion.com/ I was smokinradios Long time ago (2004)
|
|
Top |
|
 |
HAMmer
|
Post subject: Re: PAPER CAPACITOR VALUES Posted: Nov Fri 15, 2019 3:07 am |
|
Joined: Sep Sat 28, 2019 2:05 pm Posts: 37
|
I may have to give the stripes a try,I have re stuffed a few capacitors on old hallicrafters once or twice , maybe i will try something different this time !
|
|
Top |
|
 |
egg
|
Post subject: Re: PAPER CAPACITOR VALUES Posted: Nov Fri 15, 2019 3:15 am |
|
Member |
 |
Joined: Jan Tue 31, 2012 1:55 am Posts: 10354 Location: Mountains of Mourne. Ireland.
|
|
Top |
|
 |
AJJ
|
Post subject: Re: PAPER CAPACITOR VALUES Posted: Nov Fri 15, 2019 3:18 am |
|
Member |
 |
Joined: Dec Wed 25, 2013 7:57 am Posts: 3912 Location: USA
|
HAMmer wrote: thankyou i may just have to snag that it is cheap enough ! , i did find the manual online and printed it off ! . The one i am worried about is the electrolytic that is on the top side of the chassis . It is a 20 20 40 mfd according to the manual , what would your suggestions be on that one . ? If they're easier to get, you can use 22mfd and 47mfd.
|
|
Top |
|
 |
HAMmer
|
Post subject: Re: PAPER CAPACITOR VALUES Posted: Nov Sat 16, 2019 2:39 am |
|
Joined: Sep Sat 28, 2019 2:05 pm Posts: 37
|
thanks for the link i have been browsing ebay for the stripes, i was able to find all the capacitors and am now waiting . I am not sure if can post this question in this forum ,but while i am waiting for my other parts to show up i am going work on the variable air capacitor. What are your suggestions for that, i think i am going to remove it from the chassis and soak it for a while its in need of good cleaning .
|
|
Top |
|
 |
AJJ
|
Post subject: Re: PAPER CAPACITOR VALUES Posted: Nov Sat 16, 2019 6:43 am |
|
Member |
 |
Joined: Dec Wed 25, 2013 7:57 am Posts: 3912 Location: USA
|
Digikey has several sizes. Search term: "terminal strips" (link below). https://www.digikey.com/products/en/con ... l%20stripsAs far as the tuning capacitor goes, I've never done more than just blowing dust off and vacuum. Then maybe a very light rinse with 1/2 oz. of alcohol with a very soft brush. Just to make it operational.
|
|
Top |
|
 |
HAMmer
|
Post subject: Re: PAPER CAPACITOR VALUES Posted: Nov Sat 16, 2019 3:13 pm |
|
Joined: Sep Sat 28, 2019 2:05 pm Posts: 37
|
|
Top |
|
 |
HAMmer
|
Post subject: Re: PAPER CAPACITOR VALUES Posted: Nov Sun 17, 2019 1:29 am |
|
Joined: Sep Sat 28, 2019 2:05 pm Posts: 37
|
I found a multi section can capacitor its a 20 20 20 450 would this work ? the original is a 20 20 40
|
|
Top |
|
 |
AJJ
|
Post subject: Re: PAPER CAPACITOR VALUES Posted: Nov Sun 17, 2019 4:00 am |
|
Member |
 |
Joined: Dec Wed 25, 2013 7:57 am Posts: 3912 Location: USA
|
Maybe...
Are you talking about the $40 ones made by "CE Manufacturing" on eBay?
You still would have to add a second capacitor in parallel (20 + 20) to make that 3rd section "40" as the design calls for. What you probably can do, is to buy the 4-section (20, 20, 20, 20), connect two sections together to make "40."
|
|
Top |
|
 |
egg
|
Post subject: Re: PAPER CAPACITOR VALUES Posted: Nov Sun 17, 2019 4:49 am |
|
Member |
 |
Joined: Jan Tue 31, 2012 1:55 am Posts: 10354 Location: Mountains of Mourne. Ireland.
|
|
Top |
|
 |
HAMmer
|
Post subject: Re: PAPER CAPACITOR VALUES Posted: Nov Sun 17, 2019 8:51 pm |
|
Joined: Sep Sat 28, 2019 2:05 pm Posts: 37
|
yes they are the ones on ebay , I think i will just save the money and make my own . I think i am going to try eggs suggestion , When i go to construct this capacitor do i take the 2 22uf and and connect those to one terminal and then the 47 uf to the other am i understanding that correctly . and then the one terminal is a ground .
|
|
Top |
|
 |
egg
|
Post subject: Re: PAPER CAPACITOR VALUES Posted: Nov Sun 17, 2019 10:13 pm |
|
Member |
 |
Joined: Jan Tue 31, 2012 1:55 am Posts: 10354 Location: Mountains of Mourne. Ireland.
|
Connect the three negative leads together and connect them to Deck aka Chassis "ground". Here is a four-section replacement using Axial capacitors instead of Radials. In this example, the arrow points to the negative lead of the capacitor. (note: the crimped end of an Axial electrolytic capacitor is positive). ▲ photo: AlanBienlein. viewtopic.php?p=2966174#p2966174Your positive leads + are connected to resistors R15 and R14 as shown here...  Greg.
|
|
Top |
|
 |
HAMmer
|
Post subject: Re: PAPER CAPACITOR VALUES Posted: Nov Mon 18, 2019 12:21 am |
|
Joined: Sep Sat 28, 2019 2:05 pm Posts: 37
|
Cool thankyou i will try a post a pic of the capacitor i build before install . I am going through and marking everything labeling and drawing pics ext looking at the bottom end where the three terminals . I notice there is two positives going to the resistors like you where explaining but why add a third red wire in there or am i seeing things  s and i am taking it the brown wire going to the resistor is the ground wire .
|
|
Top |
|
 |
HAMmer
|
Post subject: Re: PAPER CAPACITOR VALUES Posted: Nov Mon 18, 2019 1:09 am |
|
Joined: Sep Sat 28, 2019 2:05 pm Posts: 37
|
I just realized what the third red was for after going over the schematic 
|
|
Top |
|
 |
egg
|
Post subject: Re: PAPER CAPACITOR VALUES Posted: Nov Mon 18, 2019 2:22 am |
|
Member |
 |
Joined: Jan Tue 31, 2012 1:55 am Posts: 10354 Location: Mountains of Mourne. Ireland.
|
The original Multi-section capacitor can's metal body may have been the negative connection to the chassis... if there was no insulating washer/disc ?Citing "brown wire" is meaningless as there are no colors mentioned on the schematic ... Trace the "pathways" of your wires in the circuit, and identify the components that they connect to. Label all wires with masking tape flags. Print out the schematic, and mark-it-up with (colored) Magic Markers. The tube pinouts (pin numbers) are shown on the schematic  At times... non-used solder-tabs on the tube socket can be used as convenient anchor/tie points. A schematic is not the real world→ viewtopic.php?p=3024622#p3024622Greg. Edit: 7Y4 rectifier diagrams, (some drawings are European). https://www.radiomuseum.org/tubes/tube_7y4.html
|
|
Top |
|
 |
AJJ
|
Post subject: Re: PAPER CAPACITOR VALUES Posted: Nov Mon 18, 2019 6:12 pm |
|
Member |
 |
Joined: Dec Wed 25, 2013 7:57 am Posts: 3912 Location: USA
|
Agree with Greg...
More than once, someone here reported having automatically assumed all polarized capacitor negative connections go to the metal chassis, but turned out to be wrong. So always check how the radio is physically configured.
For this radio, the schematic suggests the metal chassis is "B-" and connects to the negative side of the 3-section capacitor through its metal body. You can verify if that's the case.
Also, I've learned to be "color blind" when looking at the wiring. Even if color of wires are marked on the schematic, wire's color may have faded or was replaced in the past. Always trace the actual connections.
Attachments: |

bendix.jpg [ 41.1 KiB | Viewed 178 times ]
|
|
|
Top |
|
 |
HAMmer
|
Post subject: Re: PAPER CAPACITOR VALUES Posted: Nov Wed 20, 2019 3:50 am |
|
Joined: Sep Sat 28, 2019 2:05 pm Posts: 37
|
So i was going to use terminal stripes , but i have decided to re stuff the capacitor . I have the can taken apart and am waiting for my capacitors to arrive in the mail . I got two 22uf at 450 and 1 47uf at 450 as egg suggested . I have been reading an artical from https://www.tdpri.com/threads/restuffin ... rs.404905/. I want to try and recreate this. When i go to make this i connect all negative leads together , now when i get to the positive leads do i connect the 2 22uf pos leads together and then the positive lead from the 47uf is separate am i understanding that or would that be incorrect thanks again the help is much appreciated
|
|
Top |
|
 |
egg
|
Post subject: Re: PAPER CAPACITOR VALUES Posted: Nov Wed 20, 2019 5:18 am |
|
Member |
 |
Joined: Jan Tue 31, 2012 1:55 am Posts: 10354 Location: Mountains of Mourne. Ireland.
|
Connect the three negative leads together to make one negative connection. Leave the positive leads separate and connect them as shown below.  Insulate the positive leads inside the can. You will now have four leads exiting the can - - one negative and three positive. Kevin's complete restuffing article can be found here... http://crawlsbackward.blogspot.com/2013 ... itors.htmlGreg.
|
|
Top |
|
 |
HAMmer
|
Post subject: Re: PAPER CAPACITOR VALUES Posted: Nov Wed 20, 2019 12:15 pm |
|
Joined: Sep Sat 28, 2019 2:05 pm Posts: 37
|
thanks for the picture ! that helps me alot when i get it built i will try and post a pic !
|
|
Top |
|
 |
HAMmer
|
Post subject: Re: PAPER CAPACITOR VALUES Posted: Nov Fri 22, 2019 3:10 pm |
|
Joined: Sep Sat 28, 2019 2:05 pm Posts: 37
|
quick question seeing how i am still waiting for parts to show up , when i go to ground the capacitors could i solder the grounds to one of the locking twist taps on the base of the old capacitor
|
|
Top |
|
 |
|
|