6550 — Candidate to replace following?

Beam Tetrode — Octal

Equivalents — Same Tube, Different Names

✓ 6550A✓ 6550B✓ CK6550✓ CV5220✓ 7534✓ KT90

Top 10 Picks

KT88drop-in

6.3V✓ Close

6CD6Gdrop-in

6.3V✓ Close

5881drop-in

6.3V✓ Safe

7581drop-in

6.3V✓ Safe

Your Tube

Base: Octal

Heater: 6.3V / 1.6A

Type: beam tetrode

gm:11mA/Vra:15,000ΩIa:140mAPa:42WVs:250VCgp:0.8pF

Pinout (Octal)

nchag2g1nc

Candidates to replace (21)

Heater:

Fit:

Status:18 shown (target 6.3V only)

6.3V Heater(18 candidates)

Tube	Status ↑	Pa	Ah	Fit
6CD6G	✓ Close	15W-64%	2.5	drop-in
KT88	✓ Close	35W-17%	1.6	drop-in
5881	✓ Safe	23W-45%	0.9	drop-in
7581	✓ Safe	30W-29%	0.9	drop-in
350B	✓ Safe	27W-36%	1.6	drop-in
6F6	✓ Safe	10.5W-75%	0.7	drop-in
6F6S	✓ Safe	11W-74%	0.7	drop-in
6K6	✓ Safe	8.5W-80%	0.4	drop-in
6L6GC	✓ Safe	30W-29%	0.9	drop-in
6M6G	✓ Safe	9W-79%	0.9	drop-in
6N3C	✓ Safe	20W-52%	0.9	drop-in
6P6S	✓ Safe	13.2W-69%	0.45	drop-in
6V6	✓ Safe	14W-67%	0.45	drop-in
6W6	✓ Safe	12W-71%	1.2	drop-in
6Y6	✓ Safe	12.5W-70%	1.25	drop-in
EL34	✓ Safe	25W-40%	1.5	drop-in
KT66	✓ Safe	25W-40%	1.3	drop-in
KT77	✓ Safe	25W-40%	1.4	drop-in

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