Hughes & Kettner Switchblade 100 ECC803S V1 Option

The newer amps with the "TSC" circuit are auto bias which works pretty well so all tubes listed are plug and play.


Amps without the "TSC" circuit are adjustable bias and all you need to check and adjust the bias is a Multimeter and a bias probe, or our all-in-one octal "Pro One" bias probes (which reads plate voltage and plate current simultaneously). These are available under the "Related Products” tab as a pair.

You can use our Generic Bias Video for reference.

The video below explains the difference between bias probe types.