Silly question, but it don't hurt to be sure :-)

steve_v · 23rd September 2004, 02:17 PM

Hi.
I have a Sansui AU-9500, and would like to connect both it's internal power amps and a kitset power amp I am building to it's preamp outputs...
Preamp output is 1.5k ohm, poweramp input (both amps) is 50k ohm.
It should be okay to just split the preamp output (y cable) as the preamp out impedance is much lower than the combined poweramp in impedance (25k ohm) yes??

I just got the old girl running properly again and don't really want to blow up the preamp :-)

Cheers.

Steve.

sss · 23rd September 2004, 03:44 PM

nothing is gonna happen to the preamp

DigitalJunkie · 24th September 2004, 01:55 AM

Does the Sansui have a "connected/seperated" switch on the back? I'm assuming it has the "Preout" and "Amp In" rca's on the back (Every Sansui AUxxxx amp I have seen/owned had them)

I used to use my Sansui AU7900's preamp with my tube power amplifier for my main speakers,and the Sansui's power amp for my subs,with a LPF I built up with an opamp.. Worked great, just be sure to set the connected/seperated switch to the appropriate place..The switch connects the preamp to the amp internally,so you don't need the cables from the "preamp out" to "amp in" connectors...Just cables from the "preamp out" to the input on your other kit amp.

Good luck!

steve_v · 27th September 2004, 08:11 AM

No switch, just jumpers between the RCAs.
Very impressed with the Sansui - great sound from something that is older than I am :-)
You don't often see an owners manual with full schematics and pcb overlays nowadays either.
Don't want to move it around much though... at 23kg.

Thanks for the advice.

Steve.

23rd September 2004, 02:17 PM	#1
steve_v diyAudio Member Join Date: Sep 2004 Location: Dunedin	Silly question, but it don't hurt to be sure :-) Hi. I have a Sansui AU-9500, and would like to connect both it's internal power amps and a kitset power amp I am building to it's preamp outputs... Preamp output is 1.5k ohm, poweramp input (both amps) is 50k ohm. It should be okay to just split the preamp output (y cable) as the preamp out impedance is much lower than the combined poweramp in impedance (25k ohm) yes?? I just got the old girl running properly again and don't really want to blow up the preamp :-) Cheers. Steve.

27th September 2004, 08:11 AM	#4
steve_v diyAudio Member Join Date: Sep 2004 Location: Dunedin	Thanks people :-) No switch, just jumpers between the RCAs. Very impressed with the Sansui - great sound from something that is older than I am :-) You don't often see an owners manual with full schematics and pcb overlays nowadays either. Don't want to move it around much though... at 23kg. Thanks for the advice. Steve.

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23rd September 2004, 03:44 PM	#2
sss diyAudio Member Join Date: Jul 2003 Location: Israel , haifa	nothing is gonna happen to the preamp

24th September 2004, 01:55 AM	#3
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	Does the Sansui have a "connected/seperated" switch on the back? I'm assuming it has the "Preout" and "Amp In" rca's on the back (Every Sansui AUxxxx amp I have seen/owned had them) I used to use my Sansui AU7900's preamp with my tube power amplifier for my main speakers,and the Sansui's power amp for my subs,with a LPF I built up with an opamp.. Worked great, just be sure to set the connected/seperated switch to the appropriate place..The switch connects the preamp to the amp internally,so you don't need the cables from the "preamp out" to "amp in" connectors...Just cables from the "preamp out" to the input on your other kit amp. Good luck!