Tube cross-reference
6520 alternatives, equivalents, and replacements
Review exact electrical variations and directional substitutions recorded for the 6520 power - triode. Compare core specifications and verify every restriction before using a replacement.
Where 6520 can be used as the replacement
In these recorded relationships, 6520 is the replacement tube. The listed original tubes are not automatically suitable as replacements for 6520.
Power - Triode
The database records 6520 as a possible replacement for6AS7G.
No special restrictions are recorded for this substitution.
| Specification | 6520 replacement | Original tube |
|---|---|---|
| Tube type | Power - Triode | Power - Triode |
| Construction | Triode | Triode-Triode |
| Base | Not recorded | 8BD |
| Socket | IO | IO |
| Base pins | 8 | 8 |
| Sections | 2 | 2 |
| Heater voltage | 6.3 V | 6.3 V |
| Heater current | 2.5 A | 2.5 A |
Verify before substituting
Matching a base or heater voltage is not enough to prove that two tubes are interchangeable. Check pin connections, heater current, maximum ratings, bias requirements, warm-up behavior, and the equipment manufacturer’s service documentation before making a substitution.
View the complete 6520 specifications →