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← 6F6S
6F6S — Candidate to replace following?
Power Pentode — Octal
⚠ Safety
Jump to:
Equivalents
Your Tube
Top 10
Targets
Equivalents — Same Tube, Different Names
✓
6F6
✓
6F6GT
✓
6F6G
✓
CV1542
✓
VT-66
✓
6F6M
Top 10 Picks
6K6
drop-in
6.3V
✓ Close
6M6G
drop-in
6.3V
✓ Safe
5881
drop-in
6.3V
⚠ Low Pa
6550
drop-in
6.3V
⚠ Low Pa
Your Tube
Base:
Octal
Heater:
6.3V / 0.7A
Type:
power pentode
gm:
2.5
mA/V
ra:
80,000
Ω
Ia:
34
mA
Pa:
11
W
Vs:
250
V
Pinout (Octal)
nc
h
a
g2
g1
nc
h
Candidates to replace (18)
Heater:
6.3V
2
●
12.6V
0
25V
0
show all (3)
Fit:
Drop-in
2
Adapter
0
Status:
✓ Close
1
✓ Safe
1
⚠ Low Pa
16
2 shown (target 6.3V only)
▣ Compact
⚙ Thresholds filter
6.3V Heater
(2 candidates)
Tube
Status ↑
Pa
Ah
Fit
6K6
✓ Close
8.5
W
-23%
0.4
drop-in
6M6G
✓ Safe
9
W
-18%
0.9
drop-in
Generated 2026-04-22
Status legend →
User Guide →
target +
0
selected
pick 1+ to compare
select 1+ candidate to compare
7581
drop-in
6.3V
⚠ Low Pa
350B
drop-in
6.3V
⚠ Low Pa
6L6GC
drop-in
6.3V
⚠ Low Pa
6N3C
drop-in
6.3V
⚠ Low Pa
6P6S
drop-in
6.3V
⚠ Low Pa
6V6
drop-in
6.3V
⚠ Low Pa
k