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KT77 — Candidate to replace following?

Beam Tetrode — Octal

Equivalents — Same Tube, Different Names

✓ 6CA7

Your Tube

Base: Octal

Heater: 6.3V / 1.4A

Type: beam tetrode

gm:10.5mA/Vra:23,000ΩIa:110mAPa:25WVs:250VCgp:1pF

Pinout (Octal)

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Candidates to replace (22)

Heater:

Fit:

Status:13 shown (target 6.3V only)

6.3V Heater(13 candidates)

	Tube	Status ↑	Pa	Ah	Fit
	6CD6G	✓ Close	15W-40%	2.5	drop-in
	EL34	✓ Close	25W	1.5	drop-in
	5881	✓ Safe	23W-8%	0.9	drop-in
	6F6	✓ Safe	10.5W-58%	0.7	drop-in
	6F6S	✓ Safe	11W-56%	0.7	drop-in
	6K6	✓ Safe	8.5W-66%	0.4	drop-in
	6M6G	✓ Safe	9W-64%	0.9	drop-in
	6N3C	✓ Safe	20W-20%	0.9	drop-in
	6P6S	✓ Safe	13.2W-47%	0.45	drop-in
	6V6	✓ Safe	14W-44%	0.45	drop-in
	6W6	✓ Safe	12W-52%	1.2	drop-in
	6Y6	✓ Safe	12.5W-50%	1.25	drop-in
	KT66	✓ Safe	25W	1.3	drop-in

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

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