I want to by pass my preamp and go into the power amp.how?

bmf5150 · Post by **bmf5150** » Fri Jun 11, 2004 9:58 pm

I want to use my reis plexi for just its power amp to try a different preamp i have.how do i bypass the plexi preamp and go into the power amp?
stan

flemingmras · Post by **flemingmras** » Sat Jun 12, 2004 3:13 pm

Hey Stan. Take the wire from the center leg of the treble pot, solder it to a 1/4" Jack to the "tip" terminal on it, then connect the sleeve terminal to ground. That's it, you're done! Then plug the output of your preamp into this jack and PRESTO! Instant Marshall 100 Watt power amp! Simple huh?

Jon

Guest · Post by **Guest** » Sat Jun 12, 2004 4:57 pm

jon,thank you!!!very easy!!
stan

flemingmras · Post by **flemingmras** » Sun Jun 13, 2004 6:57 pm

Not a problem, glad I could help!

Jon

Keelz · Post by **Keelz** » Tue Jun 15, 2004 8:06 am

Now excuse my amp/electronics/this forum newbie-ness, but got what might be a stupid question to ask..

but on this same kind of idea, can i just plug a preamp (e.g rack unit preamp) into the normal input of a head, and use both the preamp and power amp of the head? So as to still have the head un-modified?

Sorry, im new to this kind of stuff

flemingmras · Post by **flemingmras** » Tue Jun 15, 2004 2:11 pm

You can, but you gotta watch the output level of the preamp unit you're using so that the amp will stay clean and not get distorted by the preamp. Set the preamp output level so that it equals the signal coming into the preamp, which is called "unity gain". Check your levels by listening to the amp and check it with the preamp in the chain, and with the preamp bypassed. You shouldn't hear anyvolume change at all between the two.

Hope this helps.

Jon

Keelz · Post by **Keelz** » Wed Jun 16, 2004 5:12 am

Thanks for the help Jon!

flemingmras · Post by **flemingmras** » Wed Jun 16, 2004 10:13 am

Glad I could help!

Jon