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dclapp 7th December 2012 03:57 AM

Pioneer SX as preamp?

I would like to try my relatively unskilled hands at building one of Mr. Pass's wonderful amplifiers.

I have a fairly large collection of Pioneer and Marantz receivers from the 1970s. Many have pre-amp outs. Could I use one of these receivers as a preamp for, say, the F5? I am thinking in particular of the Pioneer SX 5580, Which is the European version of the SX 1010.

Good idea? Bad idea?

Thank you in advance for your opinions. I love these forums and have learned so so very much from you folks!


Zen Mod 7th December 2012 08:44 AM

go and make F5

if SX 5580 doesn't have enough oumphs for it , you'll make better preamp , too


6L6 7th December 2012 02:17 PM

Yes, your receiver will make a fine preamp for an F5. There should be no drive problems, and in the very unlikely case that there is, a quick modification to the F5 will clear it up.

The F5 is so clean that you will likely want to build a Pre for it once you are done, as Zen Mod hinted at. :) :D :) :D :)

Zen Mod 7th December 2012 03:11 PM

using most beaten old amp case and rest of hardware ;)

dclapp 9th December 2012 11:05 AM

Thank you guys!

east electronics 9th December 2012 12:13 PM

this is absolutely wrong most vintage amplifiers have inputs with a sensitivity of 150-200 mv try to connect a modern source on them like a CD player or a DAC and you will partially kill a very useful area of dynamics

Add to the above that some of them have gain ...or plenty of gain on the preamp ( expected you need to ""boost ""200 mv to something like 1 volt )

The result with a modern source is that everything on the preamp is going to be too much ...Volume knob is going to kick in someway too fast loudness function is going to be almost useless since added tone will be too much ...

Another complication will be that some of these amplifiers base the tone controls sitting on the feedback node of the main amplifier while the actual tone control has no active parts ...that will be also risky to ""brake"" from pre and main amp .

Finally and eventhough some of these circuits are very musical and provide very sweet but unreal sonics most of the designs especially with today's standards have horrible crosstalk and Chanel separation issues ...That it shelf is serious draw back even more serious than the gain issues

So its a NO big time !!!

Zen Mod 9th December 2012 12:19 PM


Originally Posted by Zen Mod (
go and make F5

if SX 5580 doesn't have enough oumphs for it , you'll make better preamp , too


east electronics 9th December 2012 01:02 PM

oumphs ????

Zen Mod 9th December 2012 01:14 PM

that meant :

make F5

later - if your existing preamp solution turn to be a drek , just make worthy one

whatever you do - it will be better than old drek

6L6 9th December 2012 04:31 PM


Originally Posted by sakis (
oumphs ????

Also spelled oomph, it is supposed to be the sound that one makes when getting punched, or perhaps the sound one makes when punching.

In English slang it means power, drive, potential, clout, strength.


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