OhmNote: Electronics Tube Amp
Transformers & Valve Pinouts
About
This app provides a comprehensive suite of electronics calculators, specializing in vacuum tube amplifiers and transformer design. It offers tools for everyday electronics calculations, tube analysis, and magnetic component design, all working offline without ads.
What's New in OhmNote
1.0.5
September 23, 2026
• Tube analyzer now opens at each tube's datasheet operating point. • Load impedance range now comes from the tube instead of a fixed limit. • Fix Tube Database feature for showing pinout and tube subtitution. • Russian designations (6Л6, 6Н3П…) now find the right tube. • New tube: 26 (UX-226).
MoreSubscriptions & In-App Purchases
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FAQ
Does OhmNote have ads?
No, OhmNote is completely ad-free. The app emphasizes a privacy-first approach and does not display any advertisements to users.
What are the subscription plans for OhmNote?
OhmNote offers monthly subscriptions at $2.99 and annual subscriptions at $14.99, which includes a 14-day free trial.
Is OhmNote available offline?
Yes, OhmNote is fully functional offline. No internet connection is required to use any of its calculators or tools, making it convenient for use anywhere.
What kind of tube amp features does OhmNote offer?
OhmNote includes a Tube Analyzer for load line plotting and Q-point setting, a comprehensive tube database with specs, and tube pinout diagrams for thousands of tubes.
Can OhmNote help with transformer design?
Yes, OhmNote features designers for output transformers (OPT), power transformers, gapped-core chokes, and air-core inductors, covering essential parameters like turns ratio and inductance.
What everyday electronics calculations does OhmNote support?
OhmNote handles Ohm's law, power calculations, resistor color codes (4/5/6-band + SMD), capacitor codes, LED resistor calculations, voltage dividers, and series/parallel component combinations.
What devices is OhmNote compatible with?
OhmNote is available for iPhone, iPad, and iPod. It supports both light and dark themes for a customizable user experience.
How often is OhmNote updated?
The latest version of OhmNote is 1.0.5, last updated on September 23, 2026. Updates typically include new features, bug fixes, and performance improvements.
