My first Bluetooth tube radio has been completed. Because of its neat appearance and satisfiable sound quality, it seems good enough for daily use.
That is all metal tube pushpull amplifier. I love metal tube because of its unpretentiousness. But most people don't know there are such lightless vacuum tubes. Every time I boasedt to my friend about it, they always said "Is this really tube amplifier?". ...It somehow got on my nerves, So I decided to build with "shiny" tube next time.
And though I had been a single-minded plastic radio lover for a long time, I wanted to try something different.
Step 1: Finding out the treasure
One day last year I fond an old and shabby wooden radio on an auction site in Japan. That is pre-war era, tomb stone regenerative radio.
At that time, Japan had very few broadcast station because there were no commercial broadcast, so selectivity is not so important for radio sets. Moreover Japan of the time was very poor, superheterodyne was not populer for the ordinary Japanese. So most receivers of that generation are regenerative type.
This radio was not so good condition without knobs , windowglass and backpanel, and had many scratches.