John Curl's Blowtorch preamplifier part III

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And here is one big reason why it happened YouTube

Oh and BTW Markw4 my dad went to UC Riverside with Frank Zappa. They knew each other. I'm just dropping this so you have an understanding of the musical pedigree I hail from.

I went to high school with a few elite athletes, does this make me inherently faster, stronger and with better hand-eye coordination?

You see the massive logical fallacy going on here?
 
Maybe so, but your recording speaks for itself in some ways. This is probably not the place to talk about what is missing from conventional music education, so will spare the group too much more boredom.
If I did that recording today it would be quite a bit different. The drummer would be fired for starters. Then the vocalist 😀😉 would have to go too. Now I am MUCH more aware of what it takes to be a good musician and that isn't me. I play the soldering iron now 😛

When I cook up a circuit it's not unlike jazz improv.

BTW, my dad didn't have perfect pitch but he had a very good memory of any musical score he read. I didn't inherent much of his musical skills. But I went way beyond his understanding of sound and electronics.
 
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What is every soul here working on? Got audio projects? Am I the only brave one to tell what I am doing... or think I am doing.

?

Now I am going to measure the Crown DSP etc and see how good it is compared to miniDSP. Then decide which to use for xover.


THx-RNMarsh

What a lovely question, and it sparked so many interesting responses! After all, this is a DIY site, and the things we are all building are so much more interesting than endless arguments about capacitors and wire. I love hearing about and seeing the things that members here build, that is where the beauty and inspiration lie.

For myself, my current project is an SG4 electronic speed control for my old Thorens TD-160. In a moment of "purity" I removed the speed change mechanism from the turntable several years ago. It seemed to make sense, since I didn't own any 45 RPM discs, and it was yet another source of buzzing and vibrating parts. Plus, how hard is it to manually move a belt? (The answer is "A lot easier than keeping it there") Now I own a few 45 RPM discs I would like to play. Plus the Thorens has no speed adjustment.

So far I have gathered all the bits and bobs, an enclosure, transformers, etc, but 99% of the build is only in my head. The cooler autumn weather may inspire me to get back at it, do the case work, and fire up the soldering iron. I intend to mount the controls on the turntable. There is a "dead" knob that formerly operated the arm lift of the original tonearm, but I replaced that arm so the knob does nothing now. I will replace that with the rotary encoder for the SG4, so push to start/stop and rotate to vary speed. The other knob currently starts/stops the platter. It is a 3 position switch marked 33-off-45, which at this time means 33-off-33 since I removed the speed change mechanism. It will become the speed change switch, and will still be 3 positions, but of course won't turn off/on, so functionally will be 33-33-45. I can live with that.

Lots of wiring to make all this work, and I would like to actually measure speed stability and rumble before and after the change, we'll see how that goes. I have a HFNRR test record that has never been played.

PS: If I ever get motivated to huild a 3rd phono preamp, it will be that balanced thing of Scott's, it is such a nice design.
 
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Hi nezbleu,
Please keep me in the loop about your motor and controller. I have a customer that thinks his motor is going on his TD-126 MKII. I haven't seen it yet, but if it is the motor you may have a life-saver of a project there.

-Chris
 
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