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Old 17th January 2008, 01:40 AM   #1
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Default Help with 6AQ5 schematics

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

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

Thank you.
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Old 17th January 2008, 02:06 AM   #2
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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
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Old 17th January 2008, 05:37 AM   #3
Svein_B is offline Svein_B  Norway
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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.

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Old 17th January 2008, 05:43 AM   #4
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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?
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Old 17th January 2008, 07:27 AM   #5
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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).
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Old 17th January 2008, 11:46 AM   #6
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