Help on normal channel 18W tone stack

Rodolphe

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Hello,
i have built a 1974X clone by TAD.
it has the classic normal/tremolo design (only difference is that the tremolo acts on both channel has it cuts the signal (when active) just before the power tubes.

I love it but I find the normal channel to be a bit too dark, especially with my les paul. the trem channel hasn't got the same tonestack design, and it is brighter.
here is the normal channel tonestack:
https://www.circuitlab.com/circuit/af7zaf/marshall-18w-tone-stack/

what could i do the enhance a bit the high frequencies? change the value of 5nf cap to something smaller (like 500pf)?

you can find the complete schematic here (page 5)
http://www.tubeampdoctor.com/images/File/18W Dokumentation_komplett_0613.pdf

if someone can help.

thanks in advance.
 

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