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Limiting the bass

I would suggest doing two things.

1. Put a 200uf bypass on your cathode resistor for the KT66. Putting a 2.7uf won't give you a knee like in a crossover, it will slope way up in the frequency range. You basically put in the Vox "Twang" switch on full twang.

2. If you want to limit the bass, use an input cap and input resistor to provide a first order highpass filter. A 0.02uf cap and a 100K resistor will give you an 80hz cuttoff
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