Sunday, 30 March 2025

Aion Fx 424 Preamp

 Schematic is avaiable HERE.



19 comments:

  1. Thanks for posting! I wanted to ask is you use DIYLC to make the layouts. Also if you use it where can I download the library of skins you use because the symbols are diferent than I usually see. I want to help the blog by submiting some layouts
    Thanks :)

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  2. i don't think there are skins but i'm sure fuzzhead uses diylc for the layouts. maybe check which version you have ? ( newer version has maybe more options?)

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  3. as a midfi tape fz'ish.. gain stage somewhat similar.

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    1. There's actually a write up about that in the Aion build doc. The Midfi Demo Tape is a "soundalike" that mimics a gained-out Tascam channel strip. So some circuit similarities are unavoidable, of course. But this is almost a 1-to-1 copy of the actual channel strip from a Tascam 4 track. Since I've built a couple demo tape fuzzes, I'm now going to have to do this one, too! Also, I believe NJGTR just verified it!!!

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  6. DIYLC5.1.1 is the latest version? Which version are you using?

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  7. I have two of these in a box somewhere, this was the entry level model of the PortaStudio line?

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  8. i use v4.39, just see no need yet to update to v5.1.0/1

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    1. My Mac has DIYLC5.1, I have an old laptop that has DIYLC2, and they both still run :)

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    2. thats crazy cool! apple used to have really good hardware back in the day. used to be the standard for audio and video editing/recording

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  9. Please tag! If you get a hold of the original Tasman schematic, it really is the same preamp circuit. I’m not sure, though, why Aion went with a dual op amp for IC1. I’ve got a TL072 in IC1 and a JRC4558 in IC2. I will try some others. The break up is like an overdriven mixer input, but not very compressed as in tape distortion. I also just finished the Hudson Broadcast, which is very nice! Thank you Anders!

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    1. That’s kool, I’ll have to look through my manuals to see if I can find the schematic, I remember they still printed them in the manuals back then?

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    2. https://tetrakansupermonobloc.home.blog/2019/08/13/tascam-424-service-manual-and-schematics/

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    3. At the top of page 35 you can see the preamp schematic. It appears to be identical to the Aion schematic. I am not sure of the voltage in the original though.

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    4. All the Tascam recorders were 12V

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    5. Yea, it’s pretty much verbatim except that 10k trim which they subbed for a 10kc & made it the input control?

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  10. The 80’s Fostex 4 tracks would clip in the same fashion, more on the lower models.

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