• Blog Stats

    • 82,755 hits
  • Archives

  • Enter your email address to subscribe to this blog and receive notifications of new posts by email.

    Join 158 other followers

  • Copyright notice

    This blog entry and all other text on this blog is copyrighted, you are free to read it, discuss it with friends, co-workers and anyone else who will pay attention.

    If you want to cite this blog article or quote from it in a not for profit website or blog then please feel free to do so as long as you provide a link back to this blog article.

    If as a school teacher or university teacher you wish to use content from my blog for the education of students then you may do so as long as the teaching materials produced from my blogged writings are not distributed for profit to others. Also at University level I ask that you provide a link to my blog to the students.

    If you want to quote from this blog in an academic paper published in an academic journal then please contact me before you submit your paper to enable us to discuss the matter.

    If you wish to reuse my text in a way where you will be making a profit (however small) please contact me before you do so, and we can discuss the licensing of the content.

    If you want to contact me then please do so by e-mailing me at Chalmers University of Technology, I am quite easy to find there as I am the only person with the surname “foreman” working at Chalmers. An alternative method of contacting me is to leave a comment on a blog article. If you do not know which one to comment on then just pick one at random, please include your email in the comment so I can contact you.

  • Advertisements

Prejudice and expectation

Dear Reader,

As some of you will know I am have been repairing an old 1950s valved radio set.

I had a bit of a shock today, and before you asked I did not touch “B+ (HT)”, I had bought the radio even while the sellers at the shop said that it was broken.

The prejudice relates to the on off switch, I had thought that the switch was broken as I had needed to bypass it to power the radio up. These days most on off switches on audio gear are part of the volume control. A person turns the volume control clockwise to operate a switch.

I tried in vain to turn on the radio this way, while I was taking the radio out of the wooden case to do some work to improve the electrical safety on it (replacing a very old power lead and some other pre PVC mains wiring) I found that the power switch is a push / pull button on the same shaft as the volume control.

I checked the switch with a ohm meter and found it still worked, so I wired the new mains lead via the switch to the mains transformer of the radio. I then found to be delight that the radio worked, I have already been able to tune into some broadcast stations.

It is important to avoid being blinded by our past experiences to something which is different, I am quite glad that the shop wrongly labeled the radio as broken. I have enjoyed working on the radio (wireless) set. I will post photographs of the radio soon.


Go on, Have your say !

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: