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


It is currently Jul Sat 22, 2017 3:46 am


All times are UTC [ DST ]





Post New Topic Post Reply  [ 62 posts ]  Go to page 1, 2, 3, 4  Next
Author Message
 Post subject: zenith 7j232 volume problem
PostPosted: Dec Mon 19, 2016 10:14 pm 
Member

Joined: Mar Fri 07, 2014 10:20 am
Posts: 1596
I have a zenith 7j232 that was not working when I got it but now I have it all recapped but has only a low to medium volume thanks a0e 1k0 newfoundland Canada


Top
 Profile  
 
 Post subject: Re: zenith 7j232 volume problem
PostPosted: Dec Mon 19, 2016 11:12 pm 
Member
User avatar

Joined: Sep Sun 11, 2016 5:39 pm
Posts: 248
Location: Ga
Could it be a biasing problem ? I would check voltages on the plates and control grids.

_________________
Rich


Top
 Profile  
 
 Post subject: Re: zenith 7j232 volume problem
PostPosted: Dec Mon 19, 2016 11:15 pm 
Member

Joined: Mar Fri 07, 2014 10:20 am
Posts: 1596
the voltage on pins 3 on both 6l5 and 1j6 is 83 dc v and it should be 122 on 6l5 and 133 on 1j6


Top
 Profile  
 
 Post subject: Re: zenith 7j232 volume problem
PostPosted: Dec Mon 19, 2016 11:22 pm 
Member
User avatar

Joined: Sep Sun 11, 2016 5:39 pm
Posts: 248
Location: Ga
Sorry I don't have the schematic but does it have a selenium rectifier??

_________________
Rich


Top
 Profile  
 
 Post subject: Re: zenith 7j232 volume problem
PostPosted: Dec Tue 20, 2016 1:53 am 
Member
User avatar

Joined: Sep Sun 11, 2016 5:39 pm
Posts: 248
Location: Ga
Is this the correct schematic?


Attachments:
download-2.pdf [204.95 KiB]
Downloaded 57 times

_________________
Rich
Top
 Profile  
 
 Post subject: Re: zenith 7j232 volume problem
PostPosted: Dec Tue 20, 2016 2:12 am 
Member

Joined: Mar Fri 07, 2014 10:20 am
Posts: 1596
Yes that is the schematic


Top
 Profile  
 
 Post subject: Re: zenith 7j232 volume problem
PostPosted: Dec Tue 20, 2016 2:29 am 
Member
User avatar

Joined: Sep Sun 11, 2016 5:39 pm
Posts: 248
Location: Ga
It hurts to look at it. Too many coils and such for me . Haven't had any dealings with that type of radio. But I'm sure someone will be along to help.

_________________
Rich


Top
 Profile  
 
 Post subject: Re: zenith 7j232 volume problem
PostPosted: Dec Tue 20, 2016 2:29 pm 
Member
User avatar

Joined: Sep Sun 11, 2016 5:39 pm
Posts: 248
Location: Ga
May have a resistor that went up,in value . If all the voltages from the transformer look right , I would check the resistors associated with those tubes .

_________________
Rich


Top
 Profile  
 
 Post subject: Re: zenith 7j232 volume problem
PostPosted: Dec Tue 20, 2016 4:48 pm 
Member
User avatar

Joined: Jun Wed 14, 2006 11:49 pm
Posts: 6540
Location: Leo, IN or Zellwood, FL
spsquires wrote:
Yes that is the schematic


Check and replace all out of spec resistors in the chassis. And have you replaced the resistors and capacitors that are under the subchassis inside the power supply box? Is your 6ZY5G rectifier tube in good condition?

John k9uwa

_________________
http://www.JohnJeanAntiqueRadio.com


Top
 Profile  
 
 Post subject: Re: zenith 7j232 volume problem
PostPosted: Dec Wed 21, 2016 1:15 am 
Member

Joined: Mar Fri 07, 2014 10:20 am
Posts: 1596
I have not done anything with the resistors yet because I find the resistors do not have the color rings on them like the newer ones so I do not know how to read them properly


Top
 Profile  
 
 Post subject: Re: zenith 7j232 volume problem
PostPosted: Dec Wed 21, 2016 2:35 am 
Moderator

Joined: Jul Tue 18, 2006 5:23 am
Posts: 10610
Location: Roseville,Ca
Are they B.E.D. resistors??
Dogbone shaped??
The Body is the 1st color[number],the End is the 2nd color[number] and the Dot on the Body is the 3rd color[number].
Phil

_________________
I've been doing so much for so long with so little I can now do anything with nothing!


Top
 Profile  
 
 Post subject: Re: zenith 7j232 volume problem
PostPosted: Dec Wed 21, 2016 6:25 am 
Member
User avatar

Joined: Oct Wed 14, 2009 6:36 am
Posts: 5824
Location: New York USA
Note the 1J6 has two pilot lamps 2.9 volt 170 mA and two 21 ohm 1/2 watt resistors in the filament circuit, bottom right of the schematic. The pilots must be correct and the resistors probably need to be replaced, for the 1J6 to get the 2 volts filament voltage for good output volume. There was another of these sets a few months ago, same problem.

_________________
Diode Don, all problems rectified.

Someone with less knowledge than I had been in there before ....


Top
 Profile  
 
 Post subject: Re: zenith 7j232 volume problem
PostPosted: Dec Wed 21, 2016 12:20 pm 
Member

Joined: Mar Fri 07, 2014 10:20 am
Posts: 1596
i checked one of the pilot lights that has no bulb and I get 5.9 ac v on the tube socket so good or bad


Top
 Profile  
 
 Post subject: Re: zenith 7j232 volume problem
PostPosted: Dec Wed 21, 2016 12:41 pm 
Member

Joined: Mar Fri 07, 2014 10:20 am
Posts: 1596
the resistors are mostly dog bone shape and some new ones


Top
 Profile  
 
 Post subject: Re: zenith 7j232 volume problem
PostPosted: Dec Wed 21, 2016 12:52 pm 
Member
User avatar

Joined: Sep Sun 11, 2016 5:39 pm
Posts: 248
Location: Ga
Devildog likes dog bones resistors. Lol. I have never been able to read a dog bone resistor, is there a chart somewhere that explains how to read them?
Thanks

_________________
Rich


Top
 Profile  
 
 Post subject: Re: zenith 7j232 volume problem
PostPosted: Dec Wed 21, 2016 12:58 pm 
Member
User avatar

Joined: Jul Mon 26, 2010 8:30 pm
Posts: 19310
Location: Annapolis, MD
Philco Fan wrote:
Are they B.E.D. resistors??
Dogbone shaped??
The Body is the 1st color[number],the End is the 2nd color[number] and the Dot on the Body is the 3rd color[number].
Phil

_________________
-Mark http://pixellany.com

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


Top
 Profile  
 
 Post subject: Re: zenith 7j232 volume problem
PostPosted: Dec Wed 21, 2016 1:24 pm 
Member
User avatar

Joined: Sep Sun 11, 2016 5:39 pm
Posts: 248
Location: Ga
So, there all 3 color value resistors? Are these wire wound ?

_________________
Rich


Top
 Profile  
 
 Post subject: Re: zenith 7j232 volume problem
PostPosted: Dec Wed 21, 2016 2:11 pm 
Member
User avatar

Joined: Jul Mon 26, 2010 8:30 pm
Posts: 19310
Location: Annapolis, MD
devildog63 wrote:
So, there all 3 color value resistors? Are these wire wound ?

Most (all ?) resistors have at least 3 colors in the coding for value.

I think dogbones are carbon film?.....( not wire wound )

_________________
-Mark http://pixellany.com

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


Top
 Profile  
 
 Post subject: Re: zenith 7j232 volume problem
PostPosted: Dec Wed 21, 2016 2:23 pm 
Member
User avatar

Joined: Sep Sun 11, 2016 5:39 pm
Posts: 248
Location: Ga
So there could not be a 220K ohm dog bone? Red, red, black ,orange? That's 4 colors. R would it be 2.2 K ohm, how would,you state That?

_________________
Rich


Top
 Profile  
 
 Post subject: Re: zenith 7j232 volume problem
PostPosted: Dec Wed 21, 2016 2:58 pm 
Member
User avatar

Joined: Jul Mon 26, 2010 8:30 pm
Posts: 19310
Location: Annapolis, MD
devildog63 wrote:
So there could not be a 220K ohm dog bone? Red, red, black ,orange? That's 4 colors. R would it be 2.2 K ohm, how would,you state That?

Back to the basics of the 3-color code---applies to resistors and some capacitors:

1st digit: band 1 or "body"
2nd digit: band 2 or "end"
multiplier: band 3 or "dot"

The multiplier is the number of zeros
Some examples
red red red = 22 + 2 zeros = 2,200

red red orange = 22,000

brown red green = 1,200,000 = 1.2Mohm

220K = 220,000 => red red yellow

footnote:
you can think of the multiplier as an exponent in scientific / engineering notation---eg 2,200 = 22E2. this is not however normal practice---i.e. 2200 would be 2.2E3

_________________
-Mark http://pixellany.com

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


Top
 Profile  
 
Post New Topic Post Reply  [ 62 posts ]  Moderators: Marcc, Norm Leal Go to page 1, 2, 3, 4  Next

All times are UTC [ DST ]


Who is online

Users browsing this forum: AMChief, Bill njb, Google [Bot], Joe Connor, k9uw, Majestic-12 [Bot], Terrence and 17 guests



Search for:
Jump to:  




















Privacy Policy :: Powered by phpBB