Help with 6AQ5 schematics

[kacernator]

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]

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]

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]

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]

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]

SY's redlight district