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7581 — Candidate to replace following?

Beam Tetrode — Octal

Equivalents — Same Tube, Different Names

✓ 7581A

Your Tube

Base: Octal

Heater: 6.3V / 0.9A

Type: beam tetrode

gm:6mA/Vra:22,500ΩIa:72mAPa:30WVs:250VCgp:0.6pF

Pinout (Octal)

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Candidates to replace (22)

Heater:

Fit:

Status:16 shown (target 6.3V only)

6.3V Heater(16 candidates)

	Tube	Status ↑	Pa	Ah	Fit
	5881	✓ Close	23W-23%	0.9	drop-in
	6CD6G	✓ Close	15W-50%	2.5	drop-in
	6L6GC	✓ Close	30W	0.9	drop-in
	6N3C	✓ Close	20W-33%	0.9	drop-in
	KT66	✓ Close	25W-17%	1.3	drop-in
	350B	✓ Safe	27W-10%	1.6	drop-in
	6F6	✓ Safe	10.5W-65%	0.7	drop-in
	6F6S	✓ Safe	11W-63%	0.7	drop-in
	6K6	✓ Safe	8.5W-72%	0.4	drop-in
	6M6G	✓ Safe	9W-70%	0.9	drop-in
	6P6S	✓ Safe	13.2W-56%	0.45	drop-in
	6V6	✓ Safe	14W-53%	0.45	drop-in
	6W6	✓ Safe	12W-60%	1.2	drop-in
	6Y6	✓ Safe	12.5W-58%	1.25	drop-in
	EL34	✓ Safe	25W-17%	1.5	drop-in
	KT77	✓ Safe	25W-17%	1.4	drop-in

Generated 2026-04-09Status legend →User Guide →

target +0 selectedpick 1+ to compareselect 1+ candidate to compare