This tool provides a structured reference database for comparing vacuum tubes and evaluating potential substitutions across equivalent types, families, and base configurations. It allows side-by-side comparison of electrical characteristics, heater requirements, and operating limits.
Vacuum tube substitution is often complicated by inconsistent naming conventions, regional equivalents, and variations in electrical behavior between nominally “compatible” types. This tool consolidates that information into a standardized format, helping users identify true equivalents and understand where substitutions may require caution.
The database is designed for practical use in restoration, repair, and system design, supporting both direct comparison and exploration of tube families, base types, and application groupings.
NOTE: This tool is provided for general informational purposes only. I make no guarantees regarding accuracy, completeness, or fitness for any specific use, and I am not responsible for any errors, omissions, or outcomes resulting from its use.
NOTE: If the suggested vacuum tube replacements don't automatically display, press F5 to refresh your browser. This is a known issue with Google Chrome.
Each side uses the same nested filter structure: browse mode → category → model → manufacturer / brand. The model search boxes are fully embedded on-page and narrow the model list by tube number, name, or alias.
Tube A
ReferenceClosest substitutions
SuggestionsTube B
CandidateGrouping guide
The “Base Type” grouping
Best when physical socket fit is the first question.
The “Application” grouping
Best when you want a tube to solve a specific circuit job.
The “Equivalent Group” grouping
Best when you want family-level equivalence, such as 12AX7 / ECC83 / 7025, before drilling into brand and variant.
In this revision, the equivalent group is exposed as a top-level browse mode and each record preserves its alias family string.
Dataset notes
Total dataset records
24,617 tube records are embedded in this revision.
Application buckets
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Base buckets
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Manufacturer-level dropdowns are preserved even though most embedded rows are generic family records rather than individual production runs. That keeps the UI aligned with your preferred hierarchy while remaining honest about the current data granularity.
This page is designed as a vacuum tube comparison and substitution reference for hobbyists, restorers, radio enthusiasts, and audio users who want a fast way to compare tube families before doing deeper circuit-level verification. It helps answer common first-pass questions such as whether two tubes live in the same equivalent family, whether they share a similar base type, and whether their heater and operating values appear close enough to justify further checking.
As with any tube substitution decision, this tool is best treated as a screening layer rather than a final safety determination. Socket wiring, bias conditions, dissipation limits, plate and screen ratings, and equipment-specific circuit behavior should always be reviewed before installing an alternate tube in a radio, amplifier, or other vintage electronic device.
Good use cases
Family-level comparison, early shortlist building, and fast browsing by base type, application, or equivalent group.
Check before swapping
Pinout compatibility, heater voltage and current, plate and screen limits, rebias needs, and any socket rewiring or adapter requirements.
Best search terms
Try common aliases such as 12AX7, ECC83, 7025, EL34, 6L6GC, 5Y3, 5AR4, GZ34, 6SN7, or 12AU7.
Frequently asked questions
Can I treat an equivalent group as a guaranteed direct substitute?
Not automatically. Equivalent groups are useful for family-level research, but real substitution still depends on circuit conditions, pinout compatibility, heater requirements, and operating limits.
Why does the tool still show a manufacturer or brand step?
The interface preserves your preferred hierarchy so the page stays consistent with your other tools and remains ready for more brand-specific rows in later revisions.
What is the fastest way to use the page?
Start with a browse mode, narrow to a category, filter the model list by tube number or alias, then compare Tube A and Tube B side by side before reviewing the summary verdict.