Bench Drawer

Boring but Useful

Not every tool needs a novel. These are the quick numbers and lookups you still reach for when the interesting work is already on the bench.

No bias gauges. No scope traces. No restoration war stories. Just the glovebox math — on purpose.

Shop Math

Fuse Rating

Recommended primary fuse rating from transformer VA or individual winding loads.

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Output Transformer Impedance

Match your primary impedance to your speaker load correctly.

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Ohm’s Law / Power

Enter any two of V, I, R, or P and get the other two — the classic four-way calculator.

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RC Filter & Ripple

Find your exact corner frequencies and power-supply ripple attenuation.

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dB / Voltage / Power Ratio

Type a value into any one field — dB, voltage ratio, and power ratio convert automatically.

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Lookups

Tube Database

Max dissipation, pins, filament, and plate/screen ranges from the site tube list.

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Everything else — bias, tone stacks, scope, DIY builds, restorations, tech manual — stays in the main drawers. This page is the glovebox.