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← 12E1
Rolling Candidates to replace 12E1
Beam Tetrode — Octal
⚠ Safety
Drop-In Replacements
✓
CV345
✓
CV8025
✓
5B/351D
✓
VX6044
Top 10 Picks
EL38
drop-in
6.3V
⚠ Low Pa
KT150
adapter
6.3V
✓ Safe
KT120
adapter
6.3V
✓ Safe
EL156
adapter
6.3V
✓ Safe
KT90
adapter
6.3V
✓ Safe
EL51
adapter
6.3V
✓ Safe
6550
adapter
6.3V
✓ Safe
7027A
adapter
6.3V
✓ Safe
KT88
adapter
6.3V
✓ Safe
KT170
adapter
6.3V
✓ Safe
Rolling Candidates (145)
i
Heater:
2.1V
0
4V
0
6.3V
10
●
8.4V
0
10V
0
12.6V
0
13V
0
15V
0
16.5V
0
18.9V
0
19V
0
21V
0
22V
0
25V
0
26.5V
0
30V
0
33V
0
35V
0
45V
0
show all (19)
Fit:
Drop-in
0
Adapter
10
Status:
✓ Safe
10
⚠ Close, low Pa
1
⚠ Low Pa
134
10 shown (target 6.3V only)
▣ Compact
⚙ Thresholds filter
6.3V Heater
(10 candidates)
Tube
Status ↑
Pa
Ah
Fit
KT170
✓ Safe
85
W
1.85
adapter
KT150
✓ Safe
70
W
1.75
adapter
KT120
✓ Safe
60
W
1.8
adapter
EL156
✓ Safe
50
W
1.9
adapter
KT90
✓ Safe
50
W
1.6
adapter
EL51
✓ Safe
45
W
1.9
adapter
6550
✓ Safe
42
W
1.6
adapter
6HV5A
✓ Safe
35
W
1.8
adapter
7027A
✓ Safe
35
W
0.9
adapter
KT88
✓ Safe
35
W
1.6
adapter
Generated 2026-04-09
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