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The tape recorder's manual is available with circuit diagrams [1] and more pictures [2]. I'm not seeing an hf bias oscillator in the circuit unless the manufacturers are being clever. It was half track mono with two speeds, 3.5 ips and 1.875 ips.

Someone did a lot of work to restore these recordings!

[1] https://manualmachine.com/concertone/tr100/8544644-schematic...

[2] https://www.radiomuseum.org/r/transicord_tr_100.html

Career musician here. My dirty secret is that Coltrane doesn’t resonate with me at all. Not one iota; despite me being a huge jazz fan.

For my taste, his harmonic language tips over the threshold where it goes from being viscerally enjoyable to a more heady, academic exercise. It all feels like a blur to me. Maximal in it’s vocabulary, and yet flat in it’s overall effect. It’s often so dense that it ends up feeling “same-y” and grey to me. Like Schoenberg’s serial music.

Maybe my impression here comes from the fact that by the time I began listening to him in the mid 2000’s an entire school of derivative jazz players had long since developed upon and retroactively made his innovations feel far more common (to no fault of his own). It’s that flavor of jazz where you get the impression that the players are enjoying this way more than the audience. It’s not for me.

I picked a hell of a day to stop impulse shopping.

Sometimes these "security" solutions make you wonder whether someone took the joke about a machine without a network connection being the most secure seriously. First visit ever to this domain and:

   Sorry, you have been blocked
   You are unable to access jazzwise.com

   Why have I been blocked?

   This website is using a security service to protect itself from online 
   attacks. The action you just performed triggered the security solution. There 
   are several actions that could trigger this block including submitting a
   certain word or phrase, a SQL command or malformed data.

John Coltrane has a special meaning in jazz for me.

I don't see any other musician creating harmonies as rich as him. Yes, not even Miles Davis, Bill Evans or Tom Jobim (other jazz musicians that I like a lot).

It is surprising how fresh and accessible his music remains today. He never became a top hit, but also never stopped being relevant.

https://youtu.be/YjRbmtrDJI4

For those of you who don’t know…John Coltrane is a legend in jazz music. Posted a YouTube link to an excellent work of his above.