Great tool for easily measuring plate voltage on EL84 and other 9-pin output tube amps. But if you already know the plate voltage or can get it from specs you don’t need this to bias your amp, such as what is needed when changing power tubes. In that case just get SRS Bias Probe Tool for tube current which is measured in mAmps.
Verified purchase: Yes | Condition: New
A must to have and use tool for tube replacement
Verified purchase: Yes | Condition: New
Just what I wanted and received sooner than promised.
Verified purchase: Yes | Condition: New
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