The Beveridge OTL amplifier: Playing with the built-in EQ curve

C107 and C108 (6800pF) on the driver board set a little bit of "voicing" - a dip centered on 2KHz. You can undo this by simply lifting one leg of both caps.

I've lived with this change for a while, here are my impressions. First it's big, you can certainly hear the difference. Second... it's left me wondering if splitting the difference might sound about ideal? It's a tad bright, but I've always thought stock Bevs were voiced ever so slightly dark, if that makes any sense.

There is a second EQ point at 80Hz, this is set by C103 & C104 (.033uF). This one can't be removed, it's way too big. C103 and 104 are the only reason these giant cabinets have any bass at all...

Hope this is helpful.
 

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