American Radio History

Today I came across a website project called American Radio History and it reminded me that the internet is an amazing resource for education and sharing/archiving information. American Radio History is an online depository for endangered antique electronics knowledge captured in the form of hobbyist magazines from the early 20th century (back when tubes were the dominant active device).

The site’s FAQ provides a glimpse into how it came about:

There is so much printed material about radio and television that is becoming harder and harder to find. Libraries are discarding (often to the recycle bin) many titles. Other collections are very limited in access so “the rest of us” can’t find information we want.

The site began over a decade ago when I found I was often being asked questions I could answer from my own library. So I went digital for all to see!

Just one person does most of the work. I have off-site backups at several locations under the custody of well-respected radio historians. I also have several hearing-impaired persons who help with the major flatbed and Atiz Bookscan digitizing projects.

Here’s a short list of some of the dozens of relevant magazines for DIY tube reading:

Elektor

Radio TV Experimenter

Audiocraft

It is not difficult to find schematics in our hobby, but it is somewhat more challenging to find schematics accompanied by articles that reveal their inner workings. That is one advantage still held by professional publications like the audio magazines cataloged by American Radio History.

On the bench: Zenith K731 (7M07)

This poor radio has seen better days and doesn’t quite live up to modern safety standards with regards to mains electricity.  But the look is great and there’s generous space inside for a small tube amp. Because the enclosure must be allowed to vent for the tube amp to dissipate heat, the speaker (which I also plan to modernize) will be a small challenge. This is a great candidate for a DIY tube radio restoration.

Probable features:

  • 3-5W single channel output
  • Bluetooth connectivity
  • Aux input (analog)
  • Volume control
  • EQ (either treble/bass knobs or loudness contour)
  • Safety!