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Input impedance for Simple SE?

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jrn77478

Member
Joined 2008
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.

Jeb-D.

Member
Joined 2005
diyaudio.com/forums/swap-meet/157276-garage-sale.html#post2023179
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/AssemblyManualSimpleSE/schematic_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.
 
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