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Old 7th December 2012, 03:57 AM   #1
dclapp is offline dclapp  United States
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Default Pioneer SX as preamp?

Brothers,

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!

Doug
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Old 7th December 2012, 08:44 AM   #2
Zen Mod is offline Zen Mod  Serbia
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go and make F5

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

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Old 7th December 2012, 02:17 PM   #3
6L6 is offline 6L6  United States
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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.
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Old 7th December 2012, 03:11 PM   #4
Zen Mod is offline Zen Mod  Serbia
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using most beaten old amp case and rest of hardware
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Old 9th December 2012, 11:05 AM   #5
dclapp is offline dclapp  United States
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Default thanks

Thank you guys!
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Old 9th December 2012, 12:13 PM   #6
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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 !!!
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Old 9th December 2012, 12:19 PM   #7
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by Zen Mod View Post
go and make F5

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

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Old 9th December 2012, 01:02 PM   #8
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oumphs ????
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Old 9th December 2012, 01:14 PM   #9
Zen Mod is offline Zen Mod  Serbia
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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
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Old 9th December 2012, 04:31 PM   #10
6L6 is offline 6L6  United States
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Quote:
Originally Posted by sakis View Post
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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