Videokarma.org

Go Back   Videokarma.org TV - Video - Vintage Television & Radio Forums > Transistor Radio

We appreciate your help

in keeping this site going.
Reply
 
Thread Tools Display Modes
  #1  
Old 11-26-2015, 01:01 PM
dieseljeep dieseljeep is offline
VideoKarma Member
 
Join Date: Jul 2010
Posts: 7,562
RCA Superadio.

Yesterday was seniors day at the GW.
They has an RCA Superadio, which is the same as the GE version. It's probably the last production, using the varactor, voltage controlled tuning method. It uses a pot instead of the three gang tuning condenser.
Reply With Quote
  #2  
Old 11-26-2015, 08:27 PM
dieseljeep dieseljeep is offline
VideoKarma Member
 
Join Date: Jul 2010
Posts: 7,562
Quote:
Originally Posted by dieseljeep View Post
Yesterday was seniors day at the GW.
They has an RCA Superadio, which is the same as the GE version. It's probably the last production, using the varactor, voltage controlled tuning method. It uses a pot instead of the three gang tuning condenser.
I was trying to remove this entry, as I didn't finish it.
My 17.5 year old kitten jumped on the keyboard and somehow submitted it.
Anyway, I tried the radio and all I could hear is the tweeter. I bought it for $1.63 with my discount.
Disassembled it and it turns out the voice coil is open in the bass speaker.
I'll dig up a speaker from a cheap stereo, so no problem. This is the second one with this circuit that sounds like it has a decoupling problem, whistling on the AM band when tuning in a station.
I'll have to see if I can get a schematic from the internet.
Reply With Quote
  #3  
Old 11-26-2015, 09:48 PM
Electronic M's Avatar
Electronic M Electronic M is offline
M is for Memory
 
Join Date: Jan 2011
Location: Pewaukee/Delafield Wi
Posts: 14,758
There should be an edit button next to the quote button that would allow you to edit your post....
__________________
Tom C.

Zenith: The quality stays in EVEN after the name falls off!
What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4
Reply With Quote
  #4  
Old 11-26-2015, 10:32 PM
Findm-Keepm's Avatar
Findm-Keepm Findm-Keepm is offline
Followin' the Rules...
 
Join Date: Jun 2007
Posts: 2,832
Quote:
Originally Posted by dieseljeep View Post
I'll have to see if I can get a schematic from the internet.
or, Post the model number of the unit and see if someone here has it.....

I have yet to see a Sams entry for RCA Superadio - funny how they (sams) only reference model numbers and chassis numbers.....
__________________
Brian
USN RET (Avionics / Cal)
CET- Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"

When fuses go to work, they quit!
Reply With Quote
  #5  
Old 11-26-2015, 10:52 PM
dieseljeep dieseljeep is offline
VideoKarma Member
 
Join Date: Jul 2010
Posts: 7,562
Quote:
Originally Posted by Findm-Keepm View Post
or, Post the model number of the unit and see if someone here has it.....

I have yet to see a Sams entry for RCA Superadio - funny how they (sams) only reference model numbers and chassis numbers.....
I found the schematic! I'll look into the problem a little later.
Reply With Quote
Audiokarma
  #6  
Old 11-26-2015, 10:54 PM
dieseljeep dieseljeep is offline
VideoKarma Member
 
Join Date: Jul 2010
Posts: 7,562
Quote:
Originally Posted by Electronic M View Post
There should be an edit button next to the quote button that would allow you to edit your post....
I hit the button and in didn't seem to do much. I know, I used it before and it worked.
Reply With Quote
  #7  
Old 11-26-2015, 11:05 PM
Findm-Keepm's Avatar
Findm-Keepm Findm-Keepm is offline
Followin' the Rules...
 
Join Date: Jun 2007
Posts: 2,832
Quote:
Originally Posted by dieseljeep View Post
I found the schematic! I'll look into the problem a little later.
My point is - there may be someone here that has the same radio, same problem, or a suggested solution, but with no model number, no photos, there is seemingly no reason for the thread. Hundreds of members with tons of literature, experience and patience, and nothing to go on for a possible assist.
__________________
Brian
USN RET (Avionics / Cal)
CET- Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"

When fuses go to work, they quit!
Reply With Quote
  #8  
Old 11-27-2015, 10:21 AM
dieseljeep dieseljeep is offline
VideoKarma Member
 
Join Date: Jul 2010
Posts: 7,562
Quote:
Originally Posted by Findm-Keepm View Post
My point is - there may be someone here that has the same radio, same problem, or a suggested solution, but with no model number, no photos, there is seemingly no reason for the thread. Hundreds of members with tons of literature, experience and patience, and nothing to go on for a possible assist.
There is a regular website for the three generations of GE/RCA superadios.
The only schematic shown is for the newest model, the one I'm working on.
The GE model is 7-2887A.
The website mentions alignment, but this problem came along a few years after purchase. This is the one, I bought new.
This other one in question, is one I just picked up. I was surprised to see it had the same problem, beside the speaker.
Reply With Quote
  #9  
Old 11-27-2015, 12:46 PM
wa2ise's Avatar
wa2ise wa2ise is offline
VideoKarma Member
 
Join Date: Dec 2002
Location: USA
Posts: 3,147
There may be a coupling cap between the audio amp and the speaker, which may have gone shorted. That would burn the voice coil, ruining the speaker.
__________________
Reply With Quote
  #10  
Old 11-27-2015, 09:31 PM
dieseljeep dieseljeep is offline
VideoKarma Member
 
Join Date: Jul 2010
Posts: 7,562
Quote:
Originally Posted by wa2ise View Post
There may be a coupling cap between the audio amp and the speaker, which may have gone shorted. That would burn the voice coil, ruining the speaker.
According to the schematic, there is a 470mfd@16v 'lytic coupling cap.
I have a lot of studying to do. The circuitry is a little wild.
Reply With Quote
Audiokarma
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 03:57 AM.



Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
©Copyright 2012 VideoKarma.org, All rights reserved.