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RE: Limiting low frequency response of SE amp

I assume this is a cap-coupled design, but checking because I believe Dennis is a big fan of direct coupling.

If you modify the interstage coupling cap, the driver will still have to handle the full-range signal. It will overload long before the output tube overloads. Maybe you don't need much power, but the main (technical) point of multi-amping is to have more headroom. FWIW, at 60-80Hz the filtered signal is down 40dB, which is 0.01% of the fullrange power.

For that reason, placing the filter before the driver is much preferred.

In most cases, you can simply measure the resistance at the input RCA jack with a meter, and use that to determine the capacitance needed between the jack and whatever it connects to.

Mr. Had is often on this forum, hopefully he will weigh in on the question. Always best to get advice from the source :^)


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