Electro Harmonix 12AX7EH

I initially bought these tubes trying to solve crackling and sudden sound drops on my Marshall DSL40C (which was eventually solved by replacing the powertubes but ok..). I put these in V1+V4 together with Sovteks on V2+V3 to replace all stock Marshall branded tubes (which apparently are rebranded JJs). While being sceptical on the sound difference that different tubes can make (and not solving my initial problem), I must say that this combination gave me a brighter, clearer, more articulated sound. The individual notes are more noticable now: they were more 'muddy' with the stock tubes. The sound is not too bright or harsh and still have enough bite and body (which I believe comes from the Sovteks), which in total gives me a real versatile and balanced tone.