bias for pioneer a400?

lt cdr data · 17th November 2006, 06:44 PM

any info., 5mv? 10mv?

service manual?, thanks

lineup · 17th November 2006, 06:47 PM

Quote:

Originally posted by lt cdr data
any info., 5mv? 10mv?

service manual?, thanks

What output transistors?
What resistance have emitter resistors to those?

lt cdr data · 17th November 2006, 09:07 PM

ok, I have a schematic, but no info. as to bias,

2sc3298 and 2sa1306

emitter resistors are 0.33 ohm.

cheers...

AKN · 17th November 2006, 09:53 PM

Hi lt cdr data,

Quote:

2sc3298 and 2sa1306

These transistors are drivers, not output transistors.

lt cdr data · 18th November 2006, 02:23 PM

oops, bit hard to read...

they are 2sc3281 and 2sa1302

jkeny · 18th November 2006, 04:06 PM

Here's the schematic http://www.hifiengine.com/library_mo...ted_model=A400

John

parsecaudio · 18th November 2006, 09:46 PM

Hi to all

In the schematic the indications for voltage drop across the emitter resistors is :
13.5 mV for the 2SC emitter resistor
12.5 mV for the 2SA emitter resistor

With .33 Ohms emitter resistor the idle current is about 40 mA.
Warmest regards

Vittorio

parsecaudio · 18th November 2006, 10:02 PM

Here is the partial schematic

17th November 2006, 06:44 PM	#1
lt cdr data diyAudio Member Join Date: Dec 2003 Location: earth	bias for pioneer a400? any info., 5mv? 10mv? service manual?, thanks

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
pioneer a400	reddish75	Solid State	24	21st September 2008 11:14 PM
pioneer a400 schematic	reddish75	Solid State	2	19th September 2008 11:31 PM
Pioneer A400 pot replacement	jkeny	Parts	0	19th September 2008 11:49 AM
Buzz on Pioneer A400	Smiffy	Solid State	4	16th January 2006 05:38 PM
Pioneer A400 Headphone jack	Keesw2	Headphone Systems	0	14th October 2005 06:31 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

17th November 2006, 09:07 PM	#3
lt cdr data diyAudio Member Join Date: Dec 2003 Location: earth	ok, I have a schematic, but no info. as to bias, 2sc3298 and 2sa1306 emitter resistors are 0.33 ohm. cheers...

18th November 2006, 02:23 PM	#5
lt cdr data diyAudio Member Join Date: Dec 2003 Location: earth	oops, bit hard to read... they are 2sc3281 and 2sa1302

18th November 2006, 04:06 PM	#6
jkeny Banned Join Date: Feb 2007 Location: Dublin	Here's the schematic http://www.hifiengine.com/library_mo...ted_model=A400 John

18th November 2006, 09:46 PM	#7
parsecaudio diyAudio Member Join Date: Apr 2004 Location: ventimiglia	Hi to all In the schematic the indications for voltage drop across the emitter resistors is : 13.5 mV for the 2SC emitter resistor 12.5 mV for the 2SA emitter resistor With .33 Ohms emitter resistor the idle current is about 40 mA. Warmest regards Vittorio