- You must be logged in to reply to this topic.
I have a 2 part question which I think I know the answer to already.
Working on a Rogers 4621 radio that is getting a very hot transformer during use.
All voltages look good though and the transformer looks like the wax inside has come out at some time or another.
Would it still be good or on the way out even with voltage readings being ok.
Second question is could I replace that transformer with one out of a model 7r732. I belive rogers was using the same transformer then.
If any infomation please let me know.
How hot is ‘hot’. If it is too hot to hold your finger on (>60C) then it is probably running on the hot side of what it should. Some possible reasons for this:
– you are running a 110v primary tap on 120v on a transformer that was working close to its rating (can be a problem for many sets). Can be solved with a shunt transformer, dropper reisitor or back to back zener diodes in the primary circuit;
– there is a fault in the transformer (shorted windings) – check to see you have approximalely equal AC voltages on either side of the HT secondary winding (if not, likley some windings on the lower voltage side are shorting, causing the overheating). Heater windings rarely short;
– there is a fault in the set: most likley a very leaky smoothing capacitor(s) in the power supply or faulty recifier tube – check the HT current draw
Click on the different category headings to find out more. You can also change some of your preferences. Note that blocking some types of cookies may impact your experience on our websites and the services we are able to offer.
These cookies are strictly necessary to provide you with services available through our website and to use some of its features.
We provide you with a list of stored cookies on your computer in our domain so you can check what we stored. Due to security reasons we are not able to show or modify cookies from other domains. You can check these in your browser security settings.
We also use different external services like Google Webfonts, Google Maps, and external Video providers. Since these providers may collect personal data like your IP address we allow you to block them here. Please be aware that this might heavily reduce the functionality and appearance of our site. Changes will take effect once you reload the page.
Google Webfont Settings:
Google Map Settings:
Google reCaptcha Settings:
Vimeo and Youtube video embeds: