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7) How to achieve the classic circuits?
Let us take the ‟67 50W Plexi amp, which has the following circuitry:
a) V1 Cathode: Shared
b) V1B Coupler: 0.022uF
c) V2A Cathode Bypass: None
d) Tonestack: 56K/250pF
e) Bright Cap: 100pF
f) NFB: 27K
g) Presence Cap: 0.1uF
h) Rectifier: Solid State
To get Plexi 50 Bass:
a) Bright: None
To get JTM50:
a) Rectifier: Tube
To get ‟68 Plexi 50:
a) V1 Cathode: Split
b) V1B Coupler: 0.022uF
c) V2A Cathode Bypass: 0.68uF
d) Tonestack: 33K/500pF
e) Bright Cap: 100pF
f) NFB: 47K
g) Presence Cap: 0.1uF (some 0.68uF)
h) Rectifier: Solid State
I invite you to study the circuits of other years, so you can try them! You can view the
layouts of the other circuits for the Plexi 50 on the Ceriatone website.
You can also mix and match these settings, to create your own sounds! Enjoy!
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