Want a very rich and smooth tone with less grit? This is the Gold Pin Option Retube Kit for the Krank Krankenstien Plus. The preamp section uses four Gold Pin ECC83S's with one balanced for the phase inverter in V4. The default power tubes are a matched quad of the JJ Electronic 6550's but you can configure this kit to use the JJ KT88 for added Thunder by clicking on the "Customize" button.
These amps are adjustable bias and all you need to bias the amp is a bias probe and a Multimeter, or our all-in-one Eurotubes "Pro One" bias probe that reads both the plate current and the plate voltage simultaneously. These are available under the "Related Products" tab. You can use our Generic bias video for reference which we did on a Marshall 800 and the procedure is the same. The video below explains the difference between bias probe types.