Project Tube and ic amplifier PCB or kits

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Project Tube and ic amplifier PCB or kits

I have a project using tube 6922EH(OR ECC88)as input buffer,
LM1875 as power output IC..I had finished the engineering working sample. You can get more information in AMP Chip ......
Now i am going to make a update version of the PCB, who is interesting in this project? I think the price of all the materials in the PCB will be controlled under 40$ including the tube,ic,and heating.......
Hope more froends will join in this project....

 

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some reference schematics

here are some reference sch...

 

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another SCH...

ANOTHER ONE...

 

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My engineering working sample

My engineering working sample.....

 

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Here are some pictures of the PCB with components

Here are some pictures of the PCB with components. The PCB size is 20*15cm, 1.6mm FR4 material.
The tube we can use 6922EH or 6DJ8 or ECC88 or E88CC or 6N11......

 

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picture of the tube

picture of the tube .....below the tube is LM7806 for heating the "lamp" inside the tube.

 

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The relay part using LM7812

The relay part using LM7812 , when power on, the relays will be conected after around 10 seconds......during this 10 seconds, LM7806 is working and heating the "lamp" inside the tube...

 

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LM1875 IC

using two LM1875 IC for power ouput.....20W+20W power can be output when connected with 8_ohm impendence speakers...

 

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The rare side of the PCB........

The rare side of the PCB after soldering all the components.

 

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about the power supply

About the power supply:

20V~-----0V------20V~ 3A is suggested for LM1875.....(120W)

18V~-----0V------18V~ 3A can also be used in this case.

12V~ 0.5A is for the relay part. (6W)

8V~-----9V~ 1.0A is for the "lamp" inside the tube.(8W---9W)

So, the power of the transformer shall be around 150W in this case.