# Jan6418 Tube modules?

**URL:** <https://lookmumnocomputer.discourse.group/t/jan6418-tube-modules/6971>\
**Category:** DIY STUFF\
**Created:** [February 8, 2024, 8:24am UTC](https://lookmumnocomputer.discourse.group/t/jan6418-tube-modules/6971 "2024-02-08T08:24:39Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![SynthesiS](https://avatars.discourse-cdn.com/v4/letter/s/ea5d25/32.png) [@SynthesiS](https://lookmumnocomputer.discourse.group/u/SynthesiS)\
**Post date:** [February 8, 2024, 8:24am UTC](https://lookmumnocomputer.discourse.group/t/jan6418-tube-modules/6971/1 "2024-02-08T08:24:39Z")

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Hi!

I recently bought a Karltron Tube module in Eurorack format with a broken Jan6418 mini tube, with the intent to convert it to Kosmo format. To fix it, I bought some replacement mini tubes. As I now have some additional mini tubes, are there any synth module schematics out there that use these Jan6418 mini tubes?

Stefan

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**Author:** ![Soundbrigade](https://avatars.discourse-cdn.com/v4/letter/s/4af34b/32.png) [@Soundbrigade](https://lookmumnocomputer.discourse.group/u/Soundbrigade)\
**Post date:** [February 13, 2024, 8:15am UTC](https://lookmumnocomputer.discourse.group/t/jan6418-tube-modules/6971/2 "2024-02-13T08:15:11Z")

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That’s a rather “crappy” tube with a certain amount of microphony, but when it comes to synths, the more noirse the merrier, I guess.  
Spontaneously, a tube VCA would be possible. Check Cat Girls tube VCA; I think the 6418 may be (almost) equivalent to the Soviet 1Ж24Б (1ZJ24B).  
[https://www.elby-designs.com/contents/en-us/p429.html](https://www.elby-designs.com/contents/en-us/p429.html)

There’s a headphone amp available for this tube (microphoney):[https://diyaudioprojects.com/Tubes/6418-Tube-Preamp-Headphone-Kit/](https://diyaudioprojects.com/Tubes/6418-Tube-Preamp-Headphone-Kit/)

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**Author:** ![SynthesiS](https://avatars.discourse-cdn.com/v4/letter/s/ea5d25/32.png) [@SynthesiS](https://lookmumnocomputer.discourse.group/u/SynthesiS)\
**Post date:** [February 15, 2024, 7:33am UTC](https://lookmumnocomputer.discourse.group/t/jan6418-tube-modules/6971/3 "2024-02-15T07:33:16Z")

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Thanks for the links, I will definately dive into the Soviet tuve and schematic you linked to, to see if I can use the JAN6418 mini tube!

Stefan

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<div class="post-metadata">

**Author:** ![Soundbrigade](https://avatars.discourse-cdn.com/v4/letter/s/4af34b/32.png) [@Soundbrigade](https://lookmumnocomputer.discourse.group/u/Soundbrigade)\
**Post date:** [February 15, 2024, 7:47am UTC](https://lookmumnocomputer.discourse.group/t/jan6418-tube-modules/6971/4 "2024-02-15T07:47:56Z")

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If you’re looking for that one - check [www.fragjanzuerst.de](http://www.fragjanzuerst.de), a great place to buy Soviet tubes.