Videokarma.org

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

We appreciate your help

in keeping this site going.
Reply
 
Thread Tools Display Modes
  #1  
Old 11-12-2016, 01:00 PM
TUD1's Avatar
TUD1 TUD1 is offline
TheUniversalDave1
 
Join Date: Jan 2014
Location: Birmingham, AL
Posts: 1,304
60's RCA radio muddy audio

Got this beauty at the radio club this morning for $10. I cleaned the controls real good, but it's still having an annoying problem. It sounds excellent most of the time, but every once in a while, out of the blue, the audio will get very muddy and distorted. Most times it will fix itself after a while. Tuning doesn't help, and it's on both AM and FM when it messes up. Any ideas? Somebody at the club said it's either the discriminator or the IF needs an alignment. I think it's just the big blue filter caps.
Attached Images
File Type: jpg image.jpg (73.7 KB, 66 views)
__________________
Want to find a Zenith Space Command 400 or 600 Color set, an RCA CTC-21/30, and Sylvania Tube Color set.

Last edited by TUD1; 11-12-2016 at 01:53 PM.
Reply With Quote
  #2  
Old 11-12-2016, 03:52 PM
Findm-Keepm's Avatar
Findm-Keepm Findm-Keepm is offline
Followin' the Rules...
 
Join Date: Jun 2007
Posts: 2,622
You want help. give us a model number. Many of us here have extensive libraries of Sams (and knowledge), but none are very forthcoming without a model number...

Probably R_C ## model number format...

http://www.videokarma.org/showthread.php?t=265964
__________________
Brian
"Capacitor Cosmetologist since 1979"

When fuses go to work, they quit.


Make Safety your first thought, not your last.
Reply With Quote
  #3  
Old 11-12-2016, 04:40 PM
TUD1's Avatar
TUD1 TUD1 is offline
TheUniversalDave1
 
Join Date: Jan 2014
Location: Birmingham, AL
Posts: 1,304
Rjc47w.
__________________
Want to find a Zenith Space Command 400 or 600 Color set, an RCA CTC-21/30, and Sylvania Tube Color set.
Reply With Quote
  #4  
Old 11-12-2016, 05:12 PM
tom.j.fla tom.j.fla is offline
VideoKarma Member
 
Join Date: Aug 2014
Location: Dover,Fl
Posts: 171
Your radio is listed as SAMS 832-7. Since the problem is on both bands, most likely in the audio stages,bad cap or transistor. All the best, Tom.J
Reply With Quote
  #5  
Old 11-12-2016, 08:16 PM
dieseljeep dieseljeep is offline
VideoKarma Member
 
Join Date: Jul 2010
Posts: 5,605
Quote:
Originally Posted by tom.j.fla View Post
Your radio is listed as SAMS 832-7. Since the problem is on both bands, most likely in the audio stages,bad cap or transistor. All the best, Tom.J
I have a couple of that model. RCA out did themselves with that model!
I found, years ago that the output transistors needed resoldering, as they ran rather hot. It's the ones with the heatsinks. Just hit the PC board connections with a little fresh solder an you should good to go.
Reply With Quote
Audiokarma
  #6  
Old 11-12-2016, 08:36 PM
TUD1's Avatar
TUD1 TUD1 is offline
TheUniversalDave1
 
Join Date: Jan 2014
Location: Birmingham, AL
Posts: 1,304
Quote:
Originally Posted by dieseljeep View Post
I have a couple of that model. RCA out did themselves with that model!
I found, years ago that the output transistors needed resoldering, as they ran rather hot. It's the ones with the heatsinks. Just hit the PC board connections with a little fresh solder an you should good to go.
Thanks, mate! That's two things I can do next Saturday, the other one is change out those two big blue filters. I found an old thread where those capacitors failed and caused problems. What do you mean RCA outdid themselves? When I saw this radio down in the storage basement where members can buy stuff, I fell in love, and did not set it down until I owned it. I even pulled the money out of my wallet with one hand.
__________________
Want to find a Zenith Space Command 400 or 600 Color set, an RCA CTC-21/30, and Sylvania Tube Color set.
Reply With Quote
  #7  
Old 11-12-2016, 08:48 PM
dieseljeep dieseljeep is offline
VideoKarma Member
 
Join Date: Jul 2010
Posts: 5,605
Quote:
Originally Posted by TUD1 View Post
Thanks, mate! That's two things I can do next Saturday, the other one is change out those two big blue filters. I found an old thread where those capacitors failed and caused problems. What do you mean RCA outdid themselves? When I saw this radio down in the storage basement where members can buy stuff, I fell in love, and did not set it down until I owned it. I even pulled the money out of my wallet with one hand.
When I said they outdid themselves, I meant that I was impressed by the performance.
Reply With Quote
  #8  
Old 11-16-2016, 12:43 PM
Captainclock Captainclock is offline
Banned
 
Join Date: Dec 2013
Location: Elkhart, Indiana
Posts: 1,190
I repaired that same exact model radio for a friend of mine who had gotten her radio from her grandfather, all it needed was a pilot bulb replaced (it was a screw-base type bulb) anyways I thought it was a really nice model I believe it dates to the mid 1960s right around the time RCA, Zenith, Magnavox and some of the others started going Solid State, Magnavox had a similar model to this radio from the same time period.
Reply With Quote
  #9  
Old 12-31-2016, 08:09 AM
davet753's Avatar
davet753 davet753 is offline
David Thomas
 
Join Date: Mar 2013
Location: Knoxville, TN
Posts: 327
Nice radio, but it will never sound as good as the Zenith H845 it's sitting on top of in your picture
Reply With Quote
  #10  
Old 12-31-2016, 08:40 AM
TUD1's Avatar
TUD1 TUD1 is offline
TheUniversalDave1
 
Join Date: Jan 2014
Location: Birmingham, AL
Posts: 1,304
The best sounding radio I own is in my avatar. That radio sounds absolutely crystal clear, with excellent tonal range. If it broke, I'd be devastated.
__________________
Want to find a Zenith Space Command 400 or 600 Color set, an RCA CTC-21/30, and Sylvania Tube Color set.
Reply With Quote
Audiokarma
  #11  
Old 12-31-2016, 09:58 AM
dieseljeep dieseljeep is offline
VideoKarma Member
 
Join Date: Jul 2010
Posts: 5,605
Quote:
Originally Posted by TUD1 View Post
The best sounding radio I own is in my avatar. That radio sounds absolutely crystal clear, with excellent tonal range. If it broke, I'd be devastated.
IIRC, that's the last model of the seven tube chassis series. A few tubes were different, a 14GT8 instead of the 19T8, a 12DT8 in the FM front end and a 12BE6 AM osc and mixer. The FM tuning assembly is a lot different and more self contained.
I have that chassis in a few plastic cabinet sets and a clock radio. Slightly different control location.
Reply With Quote
  #12  
Old 12-31-2016, 10:00 AM
dieseljeep dieseljeep is offline
VideoKarma Member
 
Join Date: Jul 2010
Posts: 5,605
Quote:
Originally Posted by davet753 View Post
Nice radio, but it will never sound as good as the Zenith H845 it's sitting on top of in your picture
It still pretty well holds it's own.
Reply With Quote
  #13  
Old 12-31-2016, 01:09 PM
davet753's Avatar
davet753 davet753 is offline
David Thomas
 
Join Date: Mar 2013
Location: Knoxville, TN
Posts: 327
Quote:
Originally Posted by dieseljeep View Post
It still pretty well holds it's own.
Absolutely. I've got that RCA in the garage, and it sounds fantastic. They're a surprisingly good performer on FM. Next to a Magnavox stereo table model I restored last year, it's the best sounding solid state radio I've came across.

The audio output circuit in the Zenith H845 is nothing special (except for the tone control circuit), and the FM tuner section is a bear to get aligned correctly, but when all is said and done they sound great. I think what helps is the combination of 2 quality speakers and the thick, wood cabinet.

I've got two of the H845's. One is a mint condition all original, and the other is one I restored to use at the office. It's been used all day, 5 days a week, since I restored it about 4 years ago. I started having some FM drift issues last month; a weak 19T8 was the culprit.
Reply With Quote
  #14  
Old 01-06-2017, 09:01 AM
DavGoodlin's Avatar
DavGoodlin DavGoodlin is offline
Motorola Minion
 
Join Date: Aug 2011
Location: near Strasburg PA
Posts: 2,604
Quote:
Originally Posted by TUD1 View Post
The best sounding radio I own is in my avatar. That radio sounds absolutely crystal clear, with excellent tonal range. If it broke, I'd be devastated.
My Aunt near York, Pa had one identical to yours, always tuned to the "beautiful music" easy-listening station. You did not notice the radio right away since it was so sweet it just added to the ambience of a farmhouse kitchen in the 1960's
__________________
Dave G
WTB: 15DP4
Cabinet for 1936 RCA 4T6, 5T6 or 5T8

Last edited by DavGoodlin; 01-06-2017 at 09:05 AM.
Reply With Quote
  #15  
Old 01-06-2017, 10:16 AM
dieseljeep dieseljeep is offline
VideoKarma Member
 
Join Date: Jul 2010
Posts: 5,605
Quote:
Originally Posted by DavGoodlin View Post
My Aunt near York, Pa had one identical to yours, always tuned to the "beautiful music" easy-listening station. You did not notice the radio right away since it was so sweet it just added to the ambience of a farmhouse kitchen in the 1960's
It's amazing how some of these threads drift off the original topic, which is great and adds to the interest and fine with me!
It's getting a little dry around here!
My question is: was the distortion corrected in the solid state RCA?
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 07:25 AM.



Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
ęCopyright 2012 VideoKarma.org, All rights reserved.