Input impedance for Simple SE?

jrn77478 · 16th January 2009, 04:35 PM

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?

Thanks.

Jeb-D. · 16th January 2009, 04:47 PM

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.
http://www.tubelab.com/AssemblyManua...ematic_SSE.htm

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

16th January 2009, 04:35 PM	#1
jrn77478 diyAudio Member Join Date: Jun 2008	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? Thanks.

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16th January 2009, 04:47 PM	#2
Jeb-D. diyAudio Member Join Date: Nov 2005 Location: SoCal	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. http://www.tubelab.com/AssemblyManua...ematic_SSE.htm If your using a volume control, place the cap between the potentiometers wiper and R11. Do the same for the other channel with R21.