TDA7294 Hybrid 12AU7 Tube Advice.

[Heretik HiFi]

Hey everyone, I'm just getting ready to start a new build with a hybrid amp with 2 x TDA7294 & a 12AU7 valve, before I start I was wandering if therers any improvements that can be made to the components selected in the bom, any advice is greatly appreciated!

The pcb in question:


Current bom:



Circuit diagrams:




Cheers!

 

[Heretik HiFi]

On a closer look the bom does not match the schematic rather confused at the mo!

 

[nigelwright7557]

You have been given the mono channel parts list.

Here is the stereo one:

C:\pcbcad360\0_tda7294_valve_stereo_3.pls

Reference Value Symbol name
--------- ----- -----------

IC 1 ? TDA7294
IC 2 OUTPUT CONN1
IC 3 B- CONN1
IC 4 OUTPUT2 CONN1
IC 5 B+ CONN1
IC 6 GND CONN1
IC 7 ? TDA7294
C 1 22uf 63v C_P2_ELECT
C 2 100pf optional C_P2
C 3 1000pF C_P2
C 4 100NF 100V C_P3
C 5 10UF 63V C_P1_ELECT
C 6 10UF 63V C_P1_ELECT
C 7 470NF 63V C_P2
C 8 22uf 63v C_P2_ELECT
C 9 100NF 100V C_P3
C 10 100NF 100V C_P3
C 11 470uF 63v VO C_P5
C 12 470uF 63V VO C_P5
C 13 470NF 200V VO C_P2
C 14 1000UF 63V C_P12_345_ELECT
C 15 100pf C_P2
C 16 1000UF 63V C_P12_345_ELECT
C 17 470NF 63V C_P2
C 18 100pf optional C_P2
C 19 47UF 63V OPTIONAL C_P2_ELECT
C 20 1000pF C_P2
C 21 100pf C_P2
C 22 470NF 200V VO C_P2
C 23 47UF 63V OPTIONAL C_P2_ELECT
C 24 10UF 63V C_P1_ELECT
C 25 100NF 100V C_P3
C 26 10UF 63V C_P1_ELECT
C 27 22uf 63v C_P2_ELECT
C 28 100NF 100V C_P3
C 29 100NF 100V C_P3
C 30 22uf 63v C_P2_ELECT
D 1 12V7 5W VO ZENER_5W
PIN 1 * HOLE4MM
PIN 2 * HOLE4MM
PIN 3 * HOLE4MM
PIN 4 * HOLE4MM
Q 1 12AU7
R 1 75R 7W R_6W_P6
R 2 10K R
R 3 680R R
R 4 75R 7W R_6W_P6
R 5 22K R
R 6 4K7 R
R 7 22K R
R 8 2K2 1W VO R_1W
R 9 2R7 3W R_4W
R 10 47K R
R 11 2K2 1W VO R_1W
R 12 47K R
R 13 1M VO R
R 14 47K R
R 15 1K2 VO R C:\pcbcad360\0_tda7294_valve_stereo_3.pls

Reference Value Symbol name
--------- ----- -----------

R 16 47K R
R 17 1M VO R
R 18 22K R
R 19 1K2 VO R
R 20 680R R
R 21 22K R
R 22 10K R
R 23 4K7 R
R 24 2R7 3W R_4W
CONN 1 INPUT2 CONN2_P3
CONN 2 INPUT1 CONN2_P3

 

[Heretik HiFi]

Thank you so much! I was thinking it may have been one channels worth, looking foward to getting it built now. Thanks again.

You have been given the mono channel parts list.

Here is the stereo one:

C:\pcbcad360\0_tda7294_valve_stereo_3.pls

Reference Value Symbol name
--------- ----- -----------

IC 1 ? TDA7294
IC 2 OUTPUT CONN1
IC 3 B- CONN1
IC 4 OUTPUT2 CONN1
IC 5 B+ CONN1
IC 6 GND CONN1
IC 7 ? TDA7294
C 1 22uf 63v C_P2_ELECT
C 2 100pf optional C_P2
C 3 1000pF C_P2
C 4 100NF 100V C_P3
C 5 10UF 63V C_P1_ELECT
C 6 10UF 63V C_P1_ELECT
C 7 470NF 63V C_P2
C 8 22uf 63v C_P2_ELECT
C 9 100NF 100V C_P3
C 10 100NF 100V C_P3
C 11 470uF 63v VO C_P5
C 12 470uF 63V VO C_P5
C 13 470NF 200V VO C_P2
C 14 1000UF 63V C_P12_345_ELECT
C 15 100pf C_P2
C 16 1000UF 63V C_P12_345_ELECT
C 17 470NF 63V C_P2
C 18 100pf optional C_P2
C 19 47UF 63V OPTIONAL C_P2_ELECT
C 20 1000pF C_P2
C 21 100pf C_P2
C 22 470NF 200V VO C_P2
C 23 47UF 63V OPTIONAL C_P2_ELECT
C 24 10UF 63V C_P1_ELECT
C 25 100NF 100V C_P3
C 26 10UF 63V C_P1_ELECT
C 27 22uf 63v C_P2_ELECT
C 28 100NF 100V C_P3
C 29 100NF 100V C_P3
C 30 22uf 63v C_P2_ELECT
D 1 12V7 5W VO ZENER_5W
PIN 1 * HOLE4MM
PIN 2 * HOLE4MM
PIN 3 * HOLE4MM
PIN 4 * HOLE4MM
Q 1 12AU7
R 1 75R 7W R_6W_P6
R 2 10K R
R 3 680R R
R 4 75R 7W R_6W_P6
R 5 22K R
R 6 4K7 R
R 7 22K R
R 8 2K2 1W VO R_1W
R 9 2R7 3W R_4W
R 10 47K R
R 11 2K2 1W VO R_1W
R 12 47K R
R 13 1M VO R
R 14 47K R
R 15 1K2 VO R C:\pcbcad360\0_tda7294_valve_stereo_3.pls

Reference Value Symbol name
--------- ----- -----------

R 16 47K R
R 17 1M VO R
R 18 22K R
R 19 1K2 VO R
R 20 680R R
R 21 22K R
R 22 10K R
R 23 4K7 R
R 24 2R7 3W R_4W
CONN 1 INPUT2 CONN2_P3
CONN 2 INPUT1 CONN2_P3