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Old 30th January 2006, 06:23 PM   #1
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Default balanced grounded grid preamp

Hi! I have built a GG preamp and quite like the character. I am planing to build a balanced version.

I wonder if I add a long tail phase splitter stage

http://wiki.diyzone.net/Image:OTL0630-1.jpg

before the grounded grid would help to increase the common mode rejection ratio of the system?
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Old 31st January 2006, 12:49 PM   #2
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Default GG

A balanced version would more look like two SRPPīs working on a tail resistor or current source.

your schematic looks more like a Balanced Audio Technology.

Reinhard
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Old 31st January 2006, 01:16 PM   #3
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My plan is to use Long tail phase splitter for balanced input. (See the top schematic). The output is then connected to the input of the lower schematic.
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Old 31st January 2006, 01:30 PM   #4
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Default Balanced JJ

Have understand your plan. Why so complicated?

To have a balanced GG you only need one more triode per channel, if you like add your penthode CCS.

Reinhard
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Old 31st January 2006, 01:36 PM   #5
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Becasue I want to introduce common mod rejection into the system to get the benefit of balanced input
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Old 31st January 2006, 03:22 PM   #6
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Default GG Balanced

You will use the gg amp as a buffer, no common mode rejektion there.

As I told you before, use two Srpp stages on a CCS, ready.

Reinhard
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