Tube Amp Archive

I read some people have modified the Marshall C5 rectifier to switch between V1 Valve' (For Maximum SAG) or 'V2 Valve' Operation or the original solid state.

Does anyone know how we could do this to the JTM145 circuit?

BOOOOM!

C1 1uF 100v
C2 4700uF 25v (next to D5/D6)
C3 33uF 500v
C5 33uF 500v
C6 1uf 100v
C8 471k 500v
C9 222
C12 3.3uF 100v
C14 33uF 500v
C19 101 1kv
C20 471
C24 1uF (next to R30)
C25 220uF 500v (next to R33)

Here you go.

I will do the tone daughter board later.

Hi there,

I have a JTM145 head. What would you like to know?