Identification assistence

View previous topic View next topic Go down

Identification assistence

Post by cyberkni on Fri Jul 06, 2012 10:48 pm

New member here. Thanks for this forum.

I just picked up this radio 2 months ago. It was pretty easy to get it going again since it was just one of the leads had disconnected from the output transformer. However, it still needs some more work since it hums quite a bit, and seems to be a bit flaky in the tuning. I had difficulty locating a location station a few times in a row.

However, I have no idea what I have here. The screws that held the backpanel on say SEICO and I found a electrolytic cap. inside with the same branding.

The backpanel says:
FM-AM RADIO
6 TUBE PLUS 2 DIODE

Here are some photos



What is it? I haven't taken pictures of the internals yet, but I can if that will help..

cyberkni
New Member
New Member

Number of posts : 8
Registration date : 2012-07-06

Back to top Go down

Re: Identification assistence

Post by Bill Cahill on Sat Jul 07, 2012 12:37 am

Pictures always help, but, I believe that is the brand of radio. I believe it was made in Japan.
Your electrolytics are bad, and, If I know my 60's Japanese radios correctly, you will also need to replace all the paper capacitors, as well.
Until these things are done, the radio will not be reliable.
By the way... Welcome to the forums.
Bill Cahill

_________________
Please also join us here;  http://videokarma.org/index.php
avatar
Bill Cahill
Admin
Admin

Number of posts : 4540
Age : 66
Registration date : 2008-03-12

Back to top Go down

Re: Identification assistence

Post by cyberkni on Sat Jul 07, 2012 12:04 pm

I've ordered an assortment of electrolytic and film caps yesterday to replace all the paper and electrolytic caps.

Any ideas on what model? You'll note I'm missing the band/model tag on the speaker grille. I'm hoping to either source a replacement or at least make something that looks close to the original.

cyberkni
New Member
New Member

Number of posts : 8
Registration date : 2012-07-06

Back to top Go down

Re: Identification assistence

Post by Motorola man on Sat Jul 07, 2012 2:15 pm

I'm not sure of the model, but it looks very similar to my Sansei Polaris. It may be the same chassis in a different cabinet. If it is a Sansei, I can tell you that there is almost no documentation available for this brand. When you start replacing the caps, would you mind sending me some pictures of the underside of the chassis? Mine has a burned resistor that I can't find a value for. Sorry the picture is cut off.
Dave
avatar
Motorola man
Member
Member

Number of posts : 375
Age : 42
Registration date : 2010-02-06

Back to top Go down

Re: Identification assistence

Post by Bill Cahill on Sat Jul 07, 2012 2:38 pm

Off hand, I'd say it IS the same chassis. I have found many variations of am Japanese table radios with the same basic chassis.
Bill Cahill

_________________
Please also join us here;  http://videokarma.org/index.php
avatar
Bill Cahill
Admin
Admin

Number of posts : 4540
Age : 66
Registration date : 2008-03-12

Back to top Go down

Re: Identification assistence

Post by Resistance is Futile on Sun Jul 08, 2012 2:19 pm

its a flash picture so no go, funny it showed up while posting at first?????
Here a link

http://www.worthpoint.com/worthopedia/vintage-sansei-world-wide-radio-am-fm-137987551


Last edited by Resistance is Futile on Sun Jul 08, 2012 9:14 pm; edited 1 time in total
avatar
Resistance is Futile
Member
Member

Number of posts : 976
Age : 73
Registration date : 2008-03-12

Back to top Go down

Re: Identification assistence

Post by Bill Cahill on Sun Jul 08, 2012 6:53 pm

Cliff, your picture isn't showing.
Bill Cahill

_________________
Please also join us here;  http://videokarma.org/index.php
avatar
Bill Cahill
Admin
Admin

Number of posts : 4540
Age : 66
Registration date : 2008-03-12

Back to top Go down

Re: Identification assistence

Post by GaryRabbitt on Tue Jul 10, 2012 4:33 pm

Hi,
These are probably like the little AM only Japanses sets. Many names were used but the chassis were the same. Nice looking set though, and replace the filter caps first, then the others, after you have tested the filters for operation. That keeps new restorers from making a mistake, and having a hard time finding it. Replacing one or two caps at a time, and the radio doesn't now work, you will know exactly what parts to check for a miswire.

As far the logo, it was usually a small cut piece of brass with the name printed in white or black ink. I'd cut a piece from sheet brass to fit into the space. Get some water slide decal material and print the brand name in an appropriate font. Coat the decal with clear to protect the ink. Slide the decal on the brass, allow to dry. Coat the entire piece with clear. Now, glue it in place.

From a quick search, I found a Sansei made Zephyr set like yours. The Zephyr and Polaris might be among other names for the same set.
Image from Radiomuseum

avatar
GaryRabbitt
Member
Member

Number of posts : 96
Registration date : 2008-07-04

Back to top Go down

Re: Identification assistence

Post by cyberkni on Sun Jul 15, 2012 9:34 pm

Here is a photo of the bottom of the chassis for Motorola Man.


Let me know if you want a close of of any specific sections of the circuit.

My replacement capacitors came in this week and I swapped out all the paper and electrolytic caps. Now my hum is gone but it exposed another issue. Distortion, I tuned in a music station and audio was extremely distorted in the mid and low end. The quality is fine for voice, but music is pretty much unbearable.

I'll be hunting down the root of this issue next.

cyberkni
New Member
New Member

Number of posts : 8
Registration date : 2012-07-06

Back to top Go down

Re: Identification assistence

Post by Bill Cahill on Sun Jul 15, 2012 9:44 pm

Bad Speaker???
Bill Cahill

_________________
Please also join us here;  http://videokarma.org/index.php
avatar
Bill Cahill
Admin
Admin

Number of posts : 4540
Age : 66
Registration date : 2008-03-12

Back to top Go down

Re: Identification assistence

Post by cyberkni on Sun Jul 15, 2012 9:52 pm

The speaker *looks* like its in fair shape. No obvious tears or ripples. I was keeping an eye on the cone while listening to see if I could see anything thing opening up.

What other tests can I perform on it?

I'm wondering if my output transformer might be the issue. It looks like the wax from it melted at some point and accumulated at the bottom of the case.

cyberkni
New Member
New Member

Number of posts : 8
Registration date : 2012-07-06

Back to top Go down

Re: Identification assistence

Post by Bill Cahill on Sun Jul 15, 2012 10:15 pm

Not likely the transformer.
One test of speaker.
With radio turned off, gently push on center os cone at voice coil. Be careful not to rip it.
If you feel a rubbing from voice coil, or, it doesn't move, that's likely the culprit.
Bill Cahill

_________________
Please also join us here;  http://videokarma.org/index.php
avatar
Bill Cahill
Admin
Admin

Number of posts : 4540
Age : 66
Registration date : 2008-03-12

Back to top Go down

Re: Identification assistence

Post by cyberkni on Sun Jul 15, 2012 11:26 pm

The speaker moved easily and smoothly.

Where should I look next?

cyberkni
New Member
New Member

Number of posts : 8
Registration date : 2012-07-06

Back to top Go down

Re: Identification assistence

Post by Bill Cahill on Sun Jul 15, 2012 11:52 pm

Have you tested the tubes?
Have you tried subbing the audio tubes?
Checked resistors in audio circuit?
Has this radio been totally re capped?
Bill Cahill

_________________
Please also join us here;  http://videokarma.org/index.php
avatar
Bill Cahill
Admin
Admin

Number of posts : 4540
Age : 66
Registration date : 2008-03-12

Back to top Go down

Re: Identification assistence

Post by cyberkni on Tue Jul 17, 2012 10:14 pm

I hooked the radio up to one of my bookshelf speakers that I know is good.

I noticed that the audio will be tuned in clearly with no distortion and then seemingly randomly it will get distorted. Often just touching the tuning knob will remove the distortion.

I guess this means there is something wrong in reception side and not in the amplification stage.

I've only replaced all the paper and electrolytic capacitors that I was able to see. I'm willing to admit I might have missed one hiding under neath some other component.

I visually inspected all the other components but I have not checked values of each component yet. Nor have I tested the tubes yet. I need to find a shop or person with a tube tester near by.

cyberkni
New Member
New Member

Number of posts : 8
Registration date : 2012-07-06

Back to top Go down

Re: Identification assistence

Post by Bill Cahill on Tue Jul 17, 2012 10:49 pm

If you touch the tuner shaft, knob, or try to turn it, do you get alot of static?
Bill Cahill

_________________
Please also join us here;  http://videokarma.org/index.php
avatar
Bill Cahill
Admin
Admin

Number of posts : 4540
Age : 66
Registration date : 2008-03-12

Back to top Go down

Re: Identification assistence

Post by cyberkni on Tue Jul 17, 2012 10:58 pm

Yes.

cyberkni
New Member
New Member

Number of posts : 8
Registration date : 2012-07-06

Back to top Go down

Re: Identification assistence

Post by Bill Cahill on Tue Jul 17, 2012 11:16 pm

Then the problem is the plates on your tuner are shorting out.
That is repairable, but, tricky.
You need good eyes, light, and, patience. Check carefully to see where it's making the noise.
Very gentle pushing on plates with an insulated tool should eventually fix it. Plates are likely bent enough to cause problems. With radio un plugged, you should be able to put an ohm meter from the terminal that has the lower sections to the frame of the tuner.
Make sure no coils are accross. They often are. If so, disconnect that wire to the tuner for this.
You should get infinity on the meter.
If at any points you see resistance readings, there is your problem area. Carefully probe, and, eye ball to find the bent plates on rotor.
Bill Cahill
CAUTION!
Manny radios, at least one of the sections has positive DC voltage on it, and, you can get badly shocked. I would really reccommend any probing around be done without power on the set.

_________________
Please also join us here;  http://videokarma.org/index.php
avatar
Bill Cahill
Admin
Admin

Number of posts : 4540
Age : 66
Registration date : 2008-03-12

Back to top Go down

Re: Identification assistence

Post by cyberkni on Tue Jul 17, 2012 11:43 pm

The variable capacitor was shorting out but not inside itself. There are two short coils, one nested inside the other stacked on the variable capacitor. Its visible on the left side of the photo I posted of the bottom on the chassis.

Upon inspection those coils were touching so I tweaked the outer coil. Now it seems to tune in just fine.

Now my radio is in full working order. Thank you so much for your help. I'll make sure to post a final picture once I finish cleaning and reassembly.

cyberkni
New Member
New Member

Number of posts : 8
Registration date : 2012-07-06

Back to top Go down

Re: Identification assistence

Post by Bill Cahill on Wed Jul 18, 2012 6:47 am

Always happy to help. Maybe the set was dropped at one time....
Glad it's fixed.
Bill Cahill

_________________
Please also join us here;  http://videokarma.org/index.php
avatar
Bill Cahill
Admin
Admin

Number of posts : 4540
Age : 66
Registration date : 2008-03-12

Back to top Go down

Re: Identification assistence

Post by Sponsored content


Sponsored content


Back to top Go down

View previous topic View next topic Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum