# Any low voltage tube schematics? **URL:** \ **Category:** DIY STUFF\ **Created:** [November 28, 2020, 3:39pm UTC](https://lookmumnocomputer.discourse.group/t/any-low-voltage-tube-schematics/2399 "2020-11-28T15:39:30Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![SynthesiS](https://avatars.discourse-cdn.com/v4/letter/s/ea5d25/32.png) [@SynthesiS](https://lookmumnocomputer.discourse.group/u/SynthesiS)\ **Post date:** [November 28, 2020, 3:39pm UTC](https://lookmumnocomputer.discourse.group/t/any-low-voltage-tube-schematics/2399/1 "2020-11-28T15:39:30Z")
I really like modules with tubes, like the Safety Valve (VCA). I am trying to find other schematics for modules using a tube. However, all schematics I am able to find require a high voltage (more than 100V). Therefore, are there any other low voltage tube schematics out there? Perhaps a tube oscillator? Thanks! ---
**Author:** ![eric](https://avatars.discourse-cdn.com/v4/letter/e/898d66/32.png) [@eric](https://lookmumnocomputer.discourse.group/u/eric)\ **Post date:** [November 28, 2020, 4:13pm UTC](https://lookmumnocomputer.discourse.group/t/any-low-voltage-tube-schematics/2399/2 "2020-11-28T16:13:46Z")
The only other one I know of is this one : > **[Building the Tube Overdrive | SYINSI](https://syinsi.com/projects/building-the-tube-overdrive/)** > > Almost all component values have changed since the PCB was manufactured. See diagram below for changes. Circuit based on the Mitsumin Valvecaster, specifically the "6111 Sub Caster". This PCB also has… But I guess there must be more on the guitar FX sites… ---
**Author:** ![Bas](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/bas/32/6908_2.png) [@Bas](https://lookmumnocomputer.discourse.group/u/Bas)\ **Post date:** [November 28, 2020, 7:56pm UTC](https://lookmumnocomputer.discourse.group/t/any-low-voltage-tube-schematics/2399/3 "2020-11-28T19:56:27Z")
You might want to branch out to the guitar pedal forums. There are several dezigns that use tubes. ---
**Author:** ![Soundbrigade](https://avatars.discourse-cdn.com/v4/letter/s/4af34b/32.png) [@Soundbrigade](https://lookmumnocomputer.discourse.group/u/Soundbrigade)\ **Post date:** [December 28, 2020, 1:47pm UTC](https://lookmumnocomputer.discourse.group/t/any-low-voltage-tube-schematics/2399/4 "2020-12-28T13:47:15Z")
There are some pensize low voltage tube from Russia (and elsewhere) like the [1SH2B](https://rudatasheet.ru/tubes/1p24b/) or US type 6418. Many of the low volatge tubes are however noisy and suffers from microphonia. But check [Frag Jan Zuerst](http://fragjanzuerst.de/) for these gems! Also the journal Elektor Electronics ran a few articles on running “normal” tubes on low voltage, like EL84, EL509. Guess there was one or tweo articles that ran 2004, but I am not sure … I can have a peek. Hang on … Nope! Couldn’t find neither the journals nor copies of the articles. But the idea was to run HV tubes on LV, but special considerations had to be made. When or IF I find the papers I’ll be back. ---
**Author:** ![Dud](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/dud/32/610_2.png) [@Dud](https://lookmumnocomputer.discourse.group/u/Dud)\ **Post date:** [December 28, 2020, 6:47pm UTC](https://lookmumnocomputer.discourse.group/t/any-low-voltage-tube-schematics/2399/5 "2020-12-28T18:47:43Z")
also here > [@Tubes for Synthesizers](https://lookmumnocomputer.discourse.group/t/tubes-for-synthesizers/2243): > > Hi all! It’d only be appropriate to write a tutorial on tube theory as I understand it for synthesizer enthusiasts. I’ll add more circuits as I go. Also, I say “tube” because I prefer the sound of it to “valve”, even though I’m Australian slight_smile IMPORTANT! Tubes are usually always designed to operate at a high voltage, and it’s a lot easier to run them off mains electricity. I design my circuits around a 250V DC power supply, which gives quite a bite if you touch it! I initially had th… ---
**Author:** ![Soundbrigade](https://avatars.discourse-cdn.com/v4/letter/s/4af34b/32.png) [@Soundbrigade](https://lookmumnocomputer.discourse.group/u/Soundbrigade)\ **Post date:** [July 30, 2021, 7:18pm UTC](https://lookmumnocomputer.discourse.group/t/any-low-voltage-tube-schematics/2399/6 "2021-07-30T19:18:04Z")
Check Elektor as there are some articles on the subject: [https://worldradiohistory.com/UK/Elekto … 003-10.pdf](https://worldradiohistory.com/UK/Elektor/00s/Elektor-2003-10.pdf) Page 21 - headphone amp [https://worldradiohistory.com/UK/Elekto … 003-09.pdf](https://worldradiohistory.com/UK/Elektor/00s/Elektor-2003-09.pdf) Page 16 - various ideas how to rund tubes on low volatge.