BIASMASTER System BM4-EL84 Measures BIAS current of any EL84 etc. in your amp. Includes 4 noval probes (2x S-TBMA2-EL84) and english/german operation manual.
The BiasMaster™ allows to monitor the bias current safely and easily. While adjusting the Bias control pot of your amp the BiasMaster™ does show the actual result. This lets you set and evaluate all reasonable biasing range your amp and tubes offers to find and set your personal perfect choice.