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Old 11th November 2009, 12:27 PM   #1
Empee is offline Empee  Netherlands
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Default looking for 12AT7 / ECC81 phase splitter

Hello all,


I'm looking for a input/phase splitting stage for a PP amplifier.

I've got both halves of an ECC81 / 12AT7 available per channel.

The complete stage does not have to have any gain,
just a phase-split of reasonable-to-good hifi standard.

The output(s) of the splitter will go through caps to both halves of an
ECC83 to drive EL34's in their turn.

I've got a B+ of 300V


Has anybody got a schematic which I could use ?


Gracias,

Empee
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Old 11th November 2009, 01:02 PM   #2
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>>The output(s) of the splitter will go through caps to both halves of an
ECC83 to drive EL34's in their turn.<<

Why would you put a low power, low current ECC83 after a much higher current higher power ECC81?

Let the ECC81 drive the EL34's, and put any ECC83 gain stages BEFORE the splitter, not after.

Regards, Allen
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Old 11th November 2009, 01:11 PM   #3
45 is offline 45  Italy
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Quote:
Originally Posted by Empee View Post
Hello all,


I'm looking for a input/phase splitting stage for a PP amplifier.

I've got both halves of an ECC81 / 12AT7 available per channel.

The complete stage does not have to have any gain,
just a phase-split of reasonable-to-good hifi standard.

The output(s) of the splitter will go through caps to both halves of an
ECC83 to drive EL34's in their turn.

I've got a B+ of 300V


Has anybody got a schematic which I could use ?


Gracias,

Empee
Use a cathodyne splitter. This has to be RC coupled at the input. The cathode load is made of 2 resistors: the self bias resistor + an additional load. The sum of the two resistances is equal to the anode load resistance.
Here is an example: 6F6 Amps
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Old 11th November 2009, 01:12 PM   #4
Arnulf is offline Arnulf  Europe
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What Allan said.

Check out this page (section of phase splitters, more specifically on Long-Tailed Pair splitters).
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Old 11th November 2009, 01:20 PM   #5
Empee is offline Empee  Netherlands
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Quote:
Originally Posted by Allen Wright View Post
Why would you put a low power, low current ECC83 after a much higher current higher power ECC81?

Let the ECC81 drive the EL34's, and put any ECC83 gain stages BEFORE the splitter, not after.

Regards, Allen
Hi !

that would be because I'd like to try two SE amps which I already build
as one mono PP. So the ECC83 is already taken

I got one PP output transformer so I thought I'd give it a try....


Thanks !

Empee
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