Amp Tech Toolkit
Tube amp calculators & data
$14.99 · Designed for iPad. Not verified for macOS.
Bias, tube swaps, tone stacks, speaker loads and service records for guitar amp technicians. One price, no subscription.
Amp Tech Toolkit puts the calculations and data a guitar amp technician reaches for in one place, with records for every amp on your bench.
TUBES
• Datasheet ratings and bottom-view pinouts for 37 preamp, power and rectifier tubes
• Tube swap checker: direct swap, rebias, only if the amp is designed for it, or not compatible, with the reasons
BIAS & POWER
• Bias calculator: target idle current for any dissipation percentage, and checks of measured readings per tube
• Cathode bias: current, dissipation, resistor and bypass capacitor
• Power supply: B+ estimate, ripple, filter stages and filter-cap discharge time
CIRCUITS
• Tone stack frequency response with knob settings and editable part values
• RC filters: coupling, plate-to-grid, bright cap, cathode bypass, interstage dividers
• Ohm's law, resistor power, series and parallel, voltage dividers
• Resistor colour bands, capacitor codes and standard values
SPEAKERS & SIGNAL
• Speaker load: cabinet impedance, how power splits between speakers, and output tap matching
• Output transformer ratios and reflected loads
• Decibels, volts and watts, and output power across a dummy load
• Tone generator: sine, square, triangle, sawtooth, noise, sweeps and bursts
RECORDS
• Amps with tube complement, output taps, fuses, a bias log with per-tube readings, service log and photos, and a one-page service sheet
Every tool explains itself: a short guide the first time you open it, and ⓘ notes on the fields. Works offline. No account, no ads, no tracking.
Tube amplifiers contain lethal voltages. This app is a reference for trained technicians; check every value against the schematic and data sheets.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Nerd Alchemy LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Nerd Alchemy LLC
- Size
- 3.5 MB
- Category
- Music
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Nerd Alchemy
