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Samuel Jayaraj 4th October 2004 11:48 AM

MAT02, 03 Elektor preamp schematic
Elektor has in time past published two hi-end preamps using MAT02 and MAT03 dual transistors for the differential pair using +-15volts supply; one was with a DC offset nulling preset somewhere in the negative supply line and the other was with a servo using OP77.

I have somehow lost both the Elektor issues but would like to have the schematics. I have three assembled boards of the one with the servo. I would also like to try out the easier offset nulling arrangement.

Could someone please send me a scan of the entire articles OR if someone wants to sell their copies of Elektor containing the above, I will gladly buy them.


wopo 6th October 2004 05:28 AM

Dear Samuel Jayaraj,

do you know the number and/or the year of the Elektor issues? May be I can help you.

Greetings from Vienna



Samuel Jayaraj 9th October 2004 09:17 AM

Thanks Wopo; in India the servo version appeared in the August 1994 issue and the one with a simple pot to adjust offset a few month earlier.

But my guess is that the Indian publication lags the outside world publications by a few months.

Hence, it should be 1993 to 1994 positively.

Thanks again,

wopo 10th October 2004 06:34 AM

2 Attachment(s)
Dear Samuel!

I found a schematic in the Elektor's summer issue 1994. I think this is the drawing you mentioned.

Greetings from Vienna.



Samuel Jayaraj 11th October 2004 09:41 AM

Wopo, thanks so much for the effort to locate this schematic and post it. The one that you posted is the one with the servo control to null output DC. If you don't mind, could you please look for the one without the servo but a simple PRESET in the negative half of the circuit for DC offset adjustment. Thanks again.

moamps 11th October 2004 11:03 AM

2 Attachment(s)
R30=39K, P2=50K

Samuel Jayaraj 13th October 2004 09:38 AM

Wopo and Moamps,

Thanks so much; the search is over!!! If I remember right, Iq is set to 40mA. I've tested the sound of the servo version some years ago with MAT02 and BC560C; its probably the best I've heard till date. Thanks again.

jacco vermeulen 28th November 2004 01:28 PM

If you need any more questions answered, i built the preamp.

I did the discrete versions with Mat02, Mat03.
And the full scale preamp with MC/MD version,
with MAT02/MAT03/OP27/OPA627 with relay switches.
Later i tossed out the voltage regulation and stepped up to batteryfed.

Samuel Jayaraj 30th November 2004 12:56 PM


Which are the full scale versions that you mention? I have never seen them in Indian publications of Elektor.

I have not been able to source MAT03 so far. The ones that I bought were actually MAT02s reprinted as 03s; makes no sense. Hence, I used BC560 in the place of MAT03. This time around I'll use MPS8599/8099 (I forget which is the PNP type).

What do you think of the overall sound quality of the discrete preamp as compared to top of the line commercial offerings?

Could you please send me schematics and notes on the full versions and high quality supply schematics as well? Thanks in advance.

peranders 30th November 2004 01:03 PM

I have MAT02/03 for sale.....

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