Welcome to Australia's only Vintage Radio and Television discussion forums. You are not logged in. Please log in below, apply for an account or retrieve your password.
Australian Vintage Radio Forums
  Home  ·  About Us  ·  Discussion Forums  ·  Glossary  ·  Outside Links  ·  Policies  ·  Services Directory  ·  Safety Warnings  ·  Tutorials

Tech Talk

Forum home - Go back to Tech talk

 Ducon Serviceseal capacitors
« Back · 1 · 2 · Next »
 Return to top of page · Post #: 1 · Written at 4:39:40 PM on 25 July 2020.
Jimb's Gravatar
 Location: Kanahooka, NSW
 Member since 18 November 2016
 Member #: 2012
 Postcount: 660

Hi all my next mission is a Kriesler 11-81. It has a couple of Ducon Serviceseal capacitors amongst the mix. We're these reliable or
should they go the way of any wax paper capacitors? Most of the caps are poly it might have had some work done on it before.
Regards Jimb


 
 Return to top of page · Post #: 2 · Written at 9:51:27 PM on 25 July 2020.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4346

If it has not got "polyester" on it its probably paper, if its old. If you cannot leakage test it, replace it. If it shows evidence of being worked on, go through it with a toothpick & comb.

Crack a 9v battery across the primary of the OP transformer, to see if it makes noise in the speaker. Krieslers love wiping out OP transformers.

Marc


 
 Return to top of page · Post #: 3 · Written at 1:55:00 AM on 26 July 2020.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6013

Krieslers love wiping out OP transformers.

I'm not convinced that the sets were to blame. Vintage Pete has done post mortems on some and, IIRC, he reported the cause of death was corrosion.

The question is: who manufactured the transformers that Kriesler used?


 
 Return to top of page · Post #: 4 · Written at 8:56:24 AM on 26 July 2020.
Jimb's Gravatar
 Location: Kanahooka, NSW
 Member since 18 November 2016
 Member #: 2012
 Postcount: 660

Thank you all for your replys.
I will replace the Ducon Serviceseal capacitors along with the few remaining wax paper caps.
As far as output transformers go I have replaced two recently one was on an STC Bantam.
Regards Jimb


 
 Return to top of page · Post #: 5 · Written at 10:05:10 AM on 26 July 2020.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4346

Really am looking at this from a statistical point of view having repaired several hundred radios, over close to 50 years. In this time span one gets to know who's radios have specific failures.

Astor crap wiring

Tuning indicators: 1M resistor rarely good.

Tasma overloaded heater wiring

Tarred & feathered audio transformers & coils, as that seal either hold moisture in, or is corrosive from sulphur.

Just about every 6V6 & family dud grid resistors.

Plate resistors on 1st Audio.

That aside from the wax paper and Electrolytic caps, that have an attrition rate.

Monkeys: They will try & fix it then flip it to save face. If it has been tampered with: Never power it. If you don't know its history, check first power later: Perhaps! Some are not safe to power.

Marc


 
 Return to top of page · Post #: 6 · Written at 4:53:04 PM on 26 July 2020.
Jimb's Gravatar
 Location: Kanahooka, NSW
 Member since 18 November 2016
 Member #: 2012
 Postcount: 660

Well this Kriesler 11-81 all singing and dancing again it was overall pretty clean most of the caps had been changed at some time for poly types with the exception of the two Ducon service seal capacitors which I have replaced with poly's . I replaced the electroylitics ,which again were not the originals but I chucked them anyway. Fitted a new 3 core power cord from Carl's supply. It is a great performer very pleased with how it turned out.
My next project from Tony H's endless supply will be a little general. His Dad more than likely built it . I have one my self I restored a while ago, that one was a complete rebuild . It will be interesting to see what this one is like when I extract it from its case.
It is very wet here at the moment and it is good to have something to do to pass the time.
Regards Jim.


 
 Return to top of page · Post #: 7 · Written at 7:18:26 PM on 26 July 2020.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6013

Well this Kriesler 11-81 all singing and dancing again

Great.

I've managed to get radios singing again, but never manged to get them to dance. Smile


 
 Return to top of page · Post #: 8 · Written at 7:40:14 PM on 26 July 2020.
Jimb's Gravatar
 Location: Kanahooka, NSW
 Member since 18 November 2016
 Member #: 2012
 Postcount: 660

Yea ! I don't want it to get too excited and end up on the floor.


 
 Return to top of page · Post #: 9 · Written at 9:52:46 PM on 26 July 2020.
Vintage Pete's avatar
 Location: Albury, NSW
 Member since 1 May 2016
 Member #: 1919
 Postcount: 1993

Well, STUART Wagstaff should of done Kriesler ads!
When only the best will do.

I like most Kriesler products...soon I will start looking for an 11 97 I picked up a 11 94 not so long ago.

Pete


 
 Return to top of page · Post #: 10 · Written at 9:53:26 PM on 26 July 2020.
Robbbert's avatar
 Location: Sydney, NSW
 Member since 18 September 2015
 Member #: 1801
 Postcount: 1380

11-81 is pretty easy to work on, and can be modified for greater sensitivity if you're into that kind of thing.


 
 Return to top of page · Post #: 11 · Written at 10:15:08 PM on 26 July 2020.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4346

Isn't it frustrating to be in the wrong state when I think there's one of those & a few others cluttering up my container. And even the MKII Zephyr has done Lavington to here, via Wangaratta inside an hour.

Most times when I took it to work in South Albury, I brought it home via Beechworth to stretch the con rods, so it did not form ridges in the bore. Driving them up the "Rising Sun" is a good trial also, its long & steep (Beechworth side from Wodonga).


 
 Return to top of page · Post #: 12 · Written at 10:26:22 PM on 26 July 2020.
Vintage Pete's avatar
 Location: Albury, NSW
 Member since 1 May 2016
 Member #: 1919
 Postcount: 1993

No, As much as I love Victoria. I wouldn't want to be there while this virus is jumping 400 per day....scary what's happening there !
..but yes would like to catch up when this is over....
Pete


 
 Return to top of page · Post #: 13 · Written at 11:56:03 PM on 26 July 2020.
Brad's avatar
 Administrator
 Location: Greenwich, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 6352

Well, STUART Wagstaff should of done Kriesler ads!

I vaguely remember Mike Walsh talking up Kriesler tellies in the late 1970s. I don't recall any Kriesler radio ads though.


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 14 · Written at 1:26:38 AM on 27 July 2020.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4346

Not Radio Technical but! You will note from several of my comments, that as far as I am concerned, the problem is Melbourne. That is why I suggested the "Rabbit Proof Fence" WA has one and does not have any where near the same issue.

It is becoming more obvious by the day, that these so called academic's & experts, in truth are totally clueless when it comes to biosecurity in any form: This in conjunction with people that are just as ignorant, or more so. At no stage is there any evidence that the rural people, who grow your food have had any input and we are the people who deal with pathogens 24/7.

Last Sunday 19th and Saturday & Sunday I see yet more fiasco type oversights. On two occasions I see deep cleaning, where the persons are wearing street footwear, another a hospital where we have all the decorative PPE and yet another with canvas lace up shoes. I would be interested to get Brads comment on the later, on the basis of these being hospital issue?

I have worked in Chemicals and Laboratories, where your footwear and PPE, never left the site. If those street shoes are being taken out of any infected building, then that would go along way toward spreading it everywhere: Why has that not been seen? Easy the wrong people are running the show. There should not be one vehicle leaving Melbourne without being disinfected inside & out. most polly's are not listening.

One wonders as the "Agenda" & brains of those banned from marching in Sydney. I agree with the Police, its madness. If they go ahead they should be rounded up like Sheep & put in a detention centre.

I am one of those, that due mainly from chemical damage to the respiratory system, have big issues with masks, as they can cause severe loading if the lungs go down, which they did in March & are still not back to where they should be: That places me in danger: Not happy about that.


 
 Return to top of page · Post #: 15 · Written at 7:03:10 AM on 27 July 2020.
Brad's avatar
 Administrator
 Location: Greenwich, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 6352

Marc, I did hear something about being able to get a Dr's certificate to get an exemption. I am not sure how well it'd go down at the shops though. They are more hardline about it than Chairman Dan at the moment.


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...

 
« Back · 1 · 2 · Next »
 You need to be a member to post comments on this forum.

Sign In

Username:
Password:
 Keep me logged in.
Do not tick box on a computer with public access.