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← 5B/256M
Rolling Candidates to replace 5B/256M
Beam Tetrode — Loctal
⚠ Safety
Drop-In Replacements
✓
CV499
Top 10 Picks
5B/258M
drop-in
19V
✓ Close
Rolling Candidates (132)
i
Heater:
2.1V
0
4V
0
6.3V
26
8.4V
0
10V
0
12.6V
2
13V
0
15V
0
16.5V
0
18.9V
0
19V
1
●
21V
0
22V
0
25V
0
26.5V
0
30V
1
33V
0
35V
0
45V
0
show all (19)
Fit:
Drop-in
1
Adapter
0
Status:
✓ Close
12
✓ Safe
18
⚠ Close, low Pa
14
⚠ Low Pa
88
1 shown (target 19V only)
▣ Compact
⚙ Thresholds filter
19V Heater
(1 candidates)
Tube
Status ↑
Pa
Ah
Fit
5B/258M
✓ Close
25
W
0.3
drop-in
Generated 2026-04-09
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