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™ shows 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.

The Bias setting has a dramatic impact on the amp’s response, break-up and dynamic character.

See S-TBM4 for octal version

For spare probes, see S-TBMA2-EL84