What is the purpose of preamp jumpers?

I have a Marantz receiver vintage 1974 and I was wondering if anyone can tell me the purpose of a set of preamp jumpers supplied with the unit?

walnut06-20-2006 7:05am

jetter Details Discussions Posts This discussion Message User 2,971 posts 06-20-2006 at 04:31pm Copy Comment URL Report Comment Edit Delete Is there any issue with using the receiver amp with another preamp. I have an old yamaha receiver with the same jumper set up and was wondering if I could try the amp section of the receiver with my tube preamp?
krell_man Details Discussions Posts This discussion Message User 827 posts 06-20-2006 at 05:07pm Copy Comment URL Report Comment Edit Delete Jetter, yes, you can do that.
walnut OP Details Discussions Posts This discussion Message User 7 posts 06-20-2006 at 11:22pm Copy Comment URL Report Comment Edit Delete Hi Guys, Thanks for the imput, you've answered my question. I had bought a Marantz 2270 receiver in 1973 and later gave it to my daughter when I went crazy with Krell gear and the never ending upgrade path. While looking on ebay I found a Marantz 2325 which I purchased to use in my shop and was astounded that it sounded better that many of todays $2000.00 to $3000.00 receivers, what a steal. Thanks for the imput.