Forums :: Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives
Support This Site: Contributors :: Advertise


It is currently Dec Mon 09, 2019 2:51 am


All times are UTC [ DST ]





Post New Topic Post Reply  [ 53 posts ]  Go to page Previous  1, 2, 3  Next
Author Message
 Post subject: Re: PAPER CAPACITOR VALUES
PostPosted: Nov Fri 15, 2019 2:43 am 
Member
User avatar

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 :shock: 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. :roll: :mrgreen:

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
 Profile  
 
 Post subject: Re: PAPER CAPACITOR VALUES
PostPosted: Nov Fri 15, 2019 3:07 am 
Member

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
 Profile  
 
 Post subject: Re: PAPER CAPACITOR VALUES
PostPosted: Nov Fri 15, 2019 3:15 am 
Member
User avatar

Joined: Jan Tue 31, 2012 1:55 am
Posts: 10354
Location: Mountains of Mourne. Ireland.
Yup... insulated solder terminal strips mounted underneath the chassis is okay.

Image

Image

ebay: https://www.ebay.com/sch/i.html?_nkw=so ... ps&_sop=12


Greg.


Top
 Profile  
 
 Post subject: Re: PAPER CAPACITOR VALUES
PostPosted: Nov Fri 15, 2019 3:18 am 
Member
User avatar

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
 Profile  
 
 Post subject: Re: PAPER CAPACITOR VALUES
PostPosted: Nov Sat 16, 2019 2:39 am 
Member

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
 Profile  
 
 Post subject: Re: PAPER CAPACITOR VALUES
PostPosted: Nov Sat 16, 2019 6:43 am 
Member
User avatar

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%20strips

As 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
 Profile  
 
 Post subject: Re: PAPER CAPACITOR VALUES
PostPosted: Nov Sat 16, 2019 3:13 pm 
Member

Joined: Sep Sat 28, 2019 2:05 pm
Posts: 37
I will give that a try!


Top
 Profile  
 
 Post subject: Re: PAPER CAPACITOR VALUES
PostPosted: Nov Sun 17, 2019 1:29 am 
Member

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
 Profile  
 
 Post subject: Re: PAPER CAPACITOR VALUES
PostPosted: Nov Sun 17, 2019 4:00 am 
Member
User avatar

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
 Profile  
 
 Post subject: Re: PAPER CAPACITOR VALUES
PostPosted: Nov Sun 17, 2019 4:49 am 
Member
User avatar

Joined: Jan Tue 31, 2012 1:55 am
Posts: 10354
Location: Mountains of Mourne. Ireland.
Two of these...
22µF 450V Aluminum Electrolytic Capacitors Radial, Can 10000 Hrs @ 105°C $1.53 + $1.53
https://www.digikey.com/products/en?mpa ... W220S&v=10

and one of these...
47µF 450V Aluminum Electrolytic Capacitors Radial, Can 10000 Hrs @ 105°C $3.29
https://www.digikey.com/products/en?mpa ... 2W470&v=10

Total $6.35

:) Greg.

Panasonic ED series...
https://www.digikey.com/catalog/en/part ... &vendor=10

Or... try Sal who advertises on the right/hand column of this page→

Image
http://www.tuberadios.com/capacitors/


Top
 Profile  
 
 Post subject: Re: PAPER CAPACITOR VALUES
PostPosted: Nov Sun 17, 2019 8:51 pm 
Member

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
 Profile  
 
 Post subject: Re: PAPER CAPACITOR VALUES
PostPosted: Nov Sun 17, 2019 10:13 pm 
Member
User avatar

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).

Image
photo: AlanBienlein.
viewtopic.php?p=2966174#p2966174


Your positive leads + are connected to resistors R15 and R14 as shown here...
Image
Greg.


Top
 Profile  
 
 Post subject: Re: PAPER CAPACITOR VALUES
PostPosted: Nov Mon 18, 2019 12:21 am 
Member

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 :shock: s and i am taking it the brown wire going to the resistor is the ground wire .


Top
 Profile  
 
 Post subject: Re: PAPER CAPACITOR VALUES
PostPosted: Nov Mon 18, 2019 1:09 am 
Member

Joined: Sep Sat 28, 2019 2:05 pm
Posts: 37
I just realized what the third red was for after going over the schematic :oops:


Top
 Profile  
 
 Post subject: Re: PAPER CAPACITOR VALUES
PostPosted: Nov Mon 18, 2019 2:22 am 
Member
User avatar

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
Image
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#p3024622

Greg.


Edit: 7Y4 rectifier diagrams, (some drawings are European).
https://www.radiomuseum.org/tubes/tube_7y4.html


Top
 Profile  
 
 Post subject: Re: PAPER CAPACITOR VALUES
PostPosted: Nov Mon 18, 2019 6:12 pm 
Member
User avatar

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
bendix.jpg [ 41.1 KiB | Viewed 178 times ]
Top
 Profile  
 
 Post subject: Re: PAPER CAPACITOR VALUES
PostPosted: Nov Wed 20, 2019 3:50 am 
Member

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
 Profile  
 
 Post subject: Re: PAPER CAPACITOR VALUES
PostPosted: Nov Wed 20, 2019 5:18 am 
Member
User avatar

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.
Image
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.html

Greg.


Top
 Profile  
 
 Post subject: Re: PAPER CAPACITOR VALUES
PostPosted: Nov Wed 20, 2019 12:15 pm 
Member

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
 Profile  
 
 Post subject: Re: PAPER CAPACITOR VALUES
PostPosted: Nov Fri 22, 2019 3:10 pm 
Member

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
 Profile  
 
Post New Topic Post Reply  [ 53 posts ]  Moderators: Marcc, Norm Leal Go to page Previous  1, 2, 3  Next

All times are UTC [ DST ]


Who is online

Users browsing this forum: arzoo623, dacsman, Google [Bot], lorenz200w, Radioroslyn and 10 guests



Search for:
Jump to:  




























Privacy Policy :: Powered by phpBB