
Independent shopping perspective
The Korena take
Expansion Module E equips an Orange Valve Tester MKII to test 300B directly heated triode valves. It is a focused add-on for assessing the condition of 300B valves within an existing tester setup. If your work includes this valve type, the module gives the Valve Tester MKII the specific capability needed to check it rather than treating the module as a standalone device.

Strong match
Who this is for
- Assessing 300B directly heated triode valves with an Orange Valve Tester MKII.
Consider the trade-offs
When to look elsewhere
- Standalone testing without an Orange Valve Tester MKII.
- Testing valve types other than 300B with this specific module.
Final check
Know before you order
- 01Requires an Orange Valve Tester MKII.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01What valve does Expansion Module E support?
It adds testing capability for 300B directly heated triode valves.
02Is this a standalone valve tester?
No. It is an expansion module for the Orange Valve Tester MKII.
Reference
Full specifications
The complete catalog record, organized around the decisions musicians make when comparing gear.
1 detailsBody & build
- Color
- 300B

















