TubeOhm Instruments is a German synthesizer company founded by Andre Laska, based in Oer-Erkenschwick, North Rhine-Westphalia. Operating as a one-person enterprise, TubeOhm produces both hardware DIY synthesizer kits and VST software instruments. The company began with the Fluid VST software synthesizer and expanded over the years into hardware kits and Eurorack modules.

TubeOhm's flagship hardware product is the Jeannie, an 8-voice polyphonic DIY synthesizer developed by Laska and Rolf Degen, featuring two oscillators, a multimode filter, ten waveshapers, ring modulator, FM synthesis, and a step sequencer. The Jeannie has been sold through retailers like Exploding Shed and housed in enclosures made by Erica Synths. On the Eurorack side, TubeOhm offers the SMR4P Multi VCF, a 10HP multimode filter module combining the SMR4MkII filter with 15 filter shapes from the 4-Pole Mission VCF.

The software catalog includes a range of VST synthesizers: Alpha-Ray, a free virtual analog synth with FM and sync capabilities; Gamma-Ray, a 10-voice polyphonic synth with a built-in sampler and wave scanning; the 106 Emulation, modeled after classic analog subtractive synthesis; T-FM, a dedicated FM synthesizer; and Vintage, which recreates textures from classic hardware synthesizers. TubeOhm kits are aimed at experienced electronics hobbyists, with the company emphasizing that builders should have soldering skills and the ability to read schematics.

Tube Ohm has 4 products cataloged on Equipboard, including Synth Plugins.