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← ECC31
Rolling Candidates to replace ECC31
Small Signal Triode — Octal
⚠ Safety
Drop-In Replacements
✓
CV1285
✓
NR73
Top 10 Picks
6N7
drop-in
6.3V
✓ Safe
ECC32
adapter
6.3V
✓ Close
6S4A
adapter
6.3V
✓ Safe
6AH4
adapter
6.3V
✓ Safe
6SN7
adapter
6.3V
✓ Safe
ECC99
adapter
6.3V
✓ Safe
ML6
adapter
6.3V
✓ Safe
EC2
adapter
6.3V
⚠ Close, low Pa
EF806S
adapter
6.3V
⚠ Close, low Pa
EF86
adapter
6.3V
⚠ Close, low Pa
Rolling Candidates (108)
i
Heater:
2.5V
0
3.15V
0
3.6V
0
4.2V
0
4.5V
0
6.3V
7
●
7V
0
8.4V
0
9V
0
12.6V
2
13V
0
17.5V
0
19V
0
25V
1
show all (14)
Fit:
Drop-in
1
Adapter
6
Status:
✓ Close
1
✓ Safe
9
⚠ Close, low Pa
5
⚠ Low Pa
93
7 shown (target 6.3V only)
▣ Compact
⚙ Thresholds filter
6.3V Heater
(7 candidates)
Tube
Status ↑
Pa
Ah
Fit
ECC32
✓ Close
5
W
0.95
adapter
6N7
✓ Safe
5.5
W
0.8
drop-in
6S4A
✓ Safe
8.5
W
0.6
adapter
6AH4
✓ Safe
7.5
W
0.75
adapter
6SN7
✓ Safe
5
W
0.6
adapter
ECC99
✓ Safe
5
W
0.8
adapter
ML6
✓ Safe
5
W
0.7
adapter
Generated 2026-04-09
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