Soundcraftsmen PM840 input inpedance?

00p225

Does anyone have an owners manual or specs on the PM840? I need to lower the output level on my Foreplay preamp to get rid the hair trigger volume control and knowing the input impedance of the PM840 would help in matching the two. Thanks.

Zane

madmax

I don't know what the advertised input impedance is but on the schematic they show a 47K resistor going from + input to ground. I would say this determines a 47K input impedance.
madmax

00p225

Ok, rather than lowering the output of the Foreplay which may cause probs running long interconnects in the future, I just went to radioshack and bought a pair of male and female shielded rca jacks and soldered a 22K resistor in a series on the + side. They are only an inch long. Just plugged them into the inputs of the amp, then plug the interconnects in. Not as handy as variable gain on the amp, but 10 seconds to remove if running a different pre. The Foreplay's volume is now between 8 and 9 o'clock for normal listening. Good deal.

madmax

I need to do that or maybe a step down transformer to cut the output of my CD player to my preamp. It is way too loud and my TT is too low. Just makes for too much confusion while listening.
madmax