Help with 6AQ5 schematics

kacernator · 17th January 2008, 01:40 AM

Which of the following phase splitters would you choose for 2x6AQ5 push-pull amp?

How do I determine the resistors marked with "?".

Thank you.

kacernator · 17th January 2008, 02:06 AM

Nevermind, I will use this following schematics and change the first gain stage to ECC83 or ECC88.

http://www.bonavolta.ch/hobby/en/audio/6v6_2.htm

Svein_B · 17th January 2008, 05:37 AM

Re. first circuit alternatives: B+ is a little low to use the cathodyne / split-load. The LTP is therefore preferable.

With the LTP (as in second post) there will be enough gain for typical modern sources without the first input stage. You may consider a transistor CCS for the "tail" of the LTP.

SveinB.

kacernator · 17th January 2008, 05:43 AM

Are yousure about omiting the first gain stage? What devices can have problem driving the poweramp without the first gain stage?

What is advantage of CSS over the tail resistor?

soundbrigade · 17th January 2008, 07:27 AM

I went for the Paraphase splitter found at Fred Nachbaur's site. It was simple and has worked VERY WELL giving me many hours of pleasant musical experience (until I accidently shorted the outputs - but that's another story).

pedroskova · 17th January 2008, 11:46 AM

SY's redlight district

17th January 2008, 07:27 AM	#5
soundbrigade diyAudio Member Join Date: Feb 2006 Location: Vaenersborg, Sweden	I went for the Paraphase splitter found at Fred Nachbaur's site. It was simple and has worked VERY WELL giving me many hours of pleasant musical experience (until I accidently shorted the outputs - but that's another story). __________________ /Magnus

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17th January 2008, 02:06 AM	#2
kacernator diyAudio Member Join Date: Jan 2008	Nevermind, I will use this following schematics and change the first gain stage to ECC83 or ECC88. http://www.bonavolta.ch/hobby/en/audio/6v6_2.htm

17th January 2008, 05:37 AM	#3
Svein_B diyAudio Member Join Date: Oct 2005	Re. first circuit alternatives: B+ is a little low to use the cathodyne / split-load. The LTP is therefore preferable. With the LTP (as in second post) there will be enough gain for typical modern sources without the first input stage. You may consider a transistor CCS for the "tail" of the LTP. SveinB.

17th January 2008, 05:43 AM	#4
kacernator diyAudio Member Join Date: Jan 2008	Are yousure about omiting the first gain stage? What devices can have problem driving the poweramp without the first gain stage? What is advantage of CSS over the tail resistor?

17th January 2008, 11:46 AM	#6
pedroskova RIP Join Date: Dec 2002 Location: C'ville VA, USA	SY's redlight district

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