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-   -   Make a preamp with an already buil amplifier (http://www.diyaudio.com/forums/tubes-valves/106199-make-preamp-already-buil-amplifier.html)

fabinto 1st August 2007 01:58 PM

Make a preamp with an already buil amplifier
 
hello everybody

Can you help me to take the audio signal in my amplifier to an output RCA for just
préamp (no power signal).

My amp is

For préamp 2 X 6n3 tube
For amp 4 X EL84 tube

Where can i take the signal (on the two 6N3 ?), must a put some resistor to have the good impedance ?

I would like to make

CD player---->preamp (amp modified)------>another power amplifier or mixer...

Sorry for my english

Best regards
Fabien

d2134 2nd August 2007 09:34 AM

Can you post the existent schematic?

kevinkr 2nd August 2007 04:32 PM

Re: Make a preamp with an already buil amplifier
 
Quote:

Originally posted by fabinto
hello everybody

Can you help me to take the audio signal in my amplifier to an output RCA for just
préamp (no power signal).

My amp is

For préamp 2 X 6n3 tube
For amp 4 X EL84 tube

Where can i take the signal (on the two 6N3 ?), must a put some resistor to have the good impedance ?

I would like to make

CD player---->preamp (amp modified)------>another power amplifier or mixer...

Sorry for my english

Best regards
Fabien


It doesn't sound like this design has a dedicated pre-amp stage from your limited description. I assume the signal goes straight from the volume control right into the first stage of the power amplifier. The 2 6N3 are part of the driver circuitry of your amplifier - EL84 is a single power pentode unlike say the ECL86 which is a triode/pentode. You'd be better off building a little line stage for this application - a good diy first project IMHO.. :D


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