balanced grounded grid preamp

[ackcheng]

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?

[reinhard]

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

your schematic looks more like a Balanced Audio Technology.

Reinhard

[ackcheng]

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.

[reinhard]

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

[ackcheng]

Becasue I want to introduce common mod rejection into the system to get the benefit of balanced input

[reinhard]

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