D.C.M.B.
Direct Coupling Modulated Bias
This circuitry has been developed as an alternative to the resistance/capacitance coupling


General guidelines for the DCMB

Why DCMB

Here some schematics using the DCMB system

1)   Schematic of the famous Williamson amplifier
2)   Remarks on the input and phase splitting sections of the Williamson amplifier
3)   Input and driver sections of the Direct Coupling Modulated Bias circuit
4)   Connection of the driver section of the DCMB to the output stage.
5)   Comparison between a DCMB amplifier and a classical one :  a -  The DCMB .
5b) Comparison between a DCMB amplifier and a classical one : b - The Williamson
6)   Frequency discrimination : the traditional resistance/capacity coupling versus the DCMB
7)   A universal DCMB driver unit - schematic.
8)   A universal DCMB driver unit - topology
9)   A universal DCMB driver unit - ptp breadboard
10) DCMB needs good partners : "The special Low flux,self-compensating output transformers"
11) How different brands of 6SN7 behave with the universal DCMB driver unit.

Follows some photos of projects using DCMB system

PARALLEL 2A3s  S.E.

 300B Push-pull monobloc 


300B Push-pull monobloc

Parallel 2A3s Push-pull


6C33C-B  S.E. – 18 W

Parallel  EL34s – Single ended


D.C.M.B.  ( not connected )

Hi-Swing D.C.M.B. for 845s
 

Ari Polisois
Ari.polisois@wanadoo.fr