Help with understanding the Quad 606

405man · 28th January 2006, 11:16 AM

Can someone tell me the function of D7 in the Quad 606 schematic in the attached link http://quad405.com/606schematic.pdf

Thanks

Stuart

testlab · 28th January 2006, 03:18 PM

Quick guess is that it is there for biasing purposes.

jcx · 28th January 2006, 03:38 PM

quad is a challenge; weird circuit, poor signal flow in schematic

looks like d7 protects t9,10,11 from too much reverse base voltage - normally I would say it should only be a fault protection issue but the current dumping Qs do switch hard, t8? be junction should "catch" the drive signal

with d6?(below d5) it also limits t8? drive and can limit output current in the low side output with r18?, 22

28th January 2006, 11:16 AM	#1
405man diyAudio Member Join Date: Dec 2003 Location: Near Glasgow Scotland	Help with understanding the Quad 606 Can someone tell me the function of D7 in the Quad 606 schematic in the attached link http://quad405.com/606schematic.pdf Thanks Stuart

28th January 2006, 03:18 PM	#2
testlab diyAudio Member Join Date: Dec 2005 Location: Grand Rapids MI	Quick guess is that it is there for biasing purposes. __________________ It's not whether you win or lose, it's how you lay the blame.

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28th January 2006, 03:38 PM	#3
jcx diyAudio Member Join Date: Feb 2003 Location: ..	quad is a challenge; weird circuit, poor signal flow in schematic looks like d7 protects t9,10,11 from too much reverse base voltage - normally I would say it should only be a fault protection issue but the current dumping Qs do switch hard, t8? be junction should "catch" the drive signal with d6?(below d5) it also limits t8? drive and can limit output current in the low side output with r18?, 22

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