NAD 705 Stereo Receiver Service Manual?

Franz G · 5th September 2005, 05:27 PM

I am using my "old" NAD 705 Stereo Reciever mostly as Preamp and Tuner in conjunction with the PC and a "gainclone" as poweramp.

Some days ago, I changed two opamps (4558 and 2068) by OPA2134.

I wondered myself about not figuring out any bypass caps nearby these chips.

So I attached 470uF Panasonic direct at the voltage pins to ground.

Result: 100Hz buzz.

I tried different value of caps and tried to figure out another gnd plane.

But, still buzzing, with or without additional bypass caps. When I insert the original opamps:

Silence, as it has to be.

Now, I am looking for a service manual for this amp, but NAD manuals seems to be hard to find.

Any help?

Franz

squirrel69 · 6th April 2006, 08:15 PM

Hey Franz,

I got mine (manual) from ebay for around $13US shipped. I think there are always a couple listed. If you're still looking.

Leolabs · 7th April 2006, 01:40 AM

try to place a feedback compensation cap.

Hector Ruiz · 7th April 2006, 02:01 AM

TRy www.servicemanuals.net. They specialize in service manuals for virtually all brands of consumer hi-fi products. They also carry most replacement remote controls.

5th September 2005, 05:27 PM	#1
Franz G diyAudio Member Join Date: Jun 2004 Location: Bern / Switzerland	NAD 705 Stereo Receiver Service Manual? I am using my "old" NAD 705 Stereo Reciever mostly as Preamp and Tuner in conjunction with the PC and a "gainclone" as poweramp. Some days ago, I changed two opamps (4558 and 2068) by OPA2134. I wondered myself about not figuring out any bypass caps nearby these chips. So I attached 470uF Panasonic direct at the voltage pins to ground. Result: 100Hz buzz. I tried different value of caps and tried to figure out another gnd plane. But, still buzzing, with or without additional bypass caps. When I insert the original opamps: Silence, as it has to be. Now, I am looking for a service manual for this amp, but NAD manuals seems to be hard to find. Any help? Franz

7th April 2006, 02:01 AM	#4
Hector Ruiz diyAudio Member Join Date: Mar 2006 Location: Metairie, LA	TRy www.servicemanuals.net. They specialize in service manuals for virtually all brands of consumer hi-fi products. They also carry most replacement remote controls. __________________ Technicraft

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6th April 2006, 08:15 PM	#2
squirrel69 diyAudio Member Join Date: Apr 2006 Location: Canada	Hey Franz, I got mine (manual) from ebay for around $13US shipped. I think there are always a couple listed. If you're still looking.

7th April 2006, 01:40 AM	#3
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	try to place a feedback compensation cap.