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Old 16th January 2009, 04:35 PM   #1
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Default Input impedance for Simple SE?

I am about to start experimenting with PLLXO (passive line level crossover) and to select the right component values to start with, I need to know the input impedance of my Simple SE amp. I lack the tools to measure this properly myself.

Surely, someone here knows what the nominal input impedance of this amp is?

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Old 16th January 2009, 04:47 PM   #2
Jeb-D. is offline Jeb-D.  United States
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It's the value of the input tubes grid grid leak resistor (the pull-down resistor). Which is 220k, if you built it as shown on the Tubelab website.

If your using a volume control, place the cap between the potentiometers wiper and R11. Do the same for the other channel with R21.

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