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Do It Yourself (DIY) paradise for tube and SET project builders.

RE: Oh dear ... let me rephrase

That's very simple to do.

Just put a cap in series with the input of the tube amp.

A cap chosen against the input impedance of the tube amp (the grid resistor value of the first stage of the SET amp).

Here's the math. The cap value in uf = 159000 / (the frequency times the resistance)

If the input impedance of the amp is 100k ohms and you want to limit the amp's low end frequency response to 500Hz then a .0038uf cap placed between the input jack and the top of the grid resistor of the first stage will give you a 6db per octave high pass filter with a -3db point of 500Hz.


Tre'


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