RIAA Tube Preamplifiers based ECC83


The following schematics are the circuit diagram of  RIAA tube preamplifiers based ECC83 valve. These three circuits equalization RIAA, for enhancing low signals turntable cartridges, following a different solution, each as far as the balance.

Circuit 1

RIAA Tube Preamplifiers based ECC83   circuit 1

Components List:

R1 = 47K ohm
R2,R3 = 220K ohm
R4,R5 = 2.2K ohm
R6 = 1M ohm
R7 = 820K ohm
R8 = 27K ohm
C1 = 33-470pF mylar
C2 = 100nF/400V
C3 = 22nF/400V
C4 = 10nF/100V
C5 = 3.3nF/100V
V1 = ECC83

 
Circuit 2

RIAA Tube Preamplifiers based ECC83   circuit 2

Components List:

R1 = 47K ohm
R2,R3 = 330K ohm
R4,R5 = 2.2K ohm
R6 = 470K ohm
R7 = 100K ohm
R8 = 2.2M ohm
C1 = 33-470pF mylar
C2 = 100nF/400V
C3 = 220nF/400V
C4 = 3.3nF/100V
C5 = 750pF mylar
V1 = ECC83

 

Circuit 3

RIAA Tube Preamplifiers based ECC83   circuit 3

Components List:

R1 = 47Kohm
R2,R3 = 220Kohm
R4,R5 = 2.2Kohm
R6 = 1M ohm
R7 = 10K ohm
R8 = 8.2K ohm
R9 = 91K ohm
R10 = 910K ohm
R11 = 82K ohm
C1 = 33pF-470pF mylar
C2,C3 = 470nF/400V
C4 = 4.7nF/100V
C5 = 2.7nF/100V
C6 = 1nF/100V
C7 = 2.2nF/100V
C8 = 4.7uF/100V
C9 = 10uF/100V
V1 = ECC83

 

In the circuit of PHONO 1, we de-emphasis on passive filter placed between the two departments of tube V1. In PHONO 2, followed the classical solution of active de-emphasis. In PHONO 3, finally there is a combination of the two above solutions, the passive for the high frequencies and active at low frequencies.

The capacitance of the capacitor C1, can be modified to match the technical characteristics of the head, which the mark will have to reinforce each preamplifier.

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