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Old 28th July 2006, 07:57 AM   #1
Luck is offline Luck  China
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Smile My amplifier Using Tube buffer and LM1875

Hi,All
I made my new amplifier with tube 6922EH as the input buffer,

2*LM1875 for the power ouput.It sounds nice, i think output power is not the first place but the quality of the sound is.

Here are some pictures.....Cheers........
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Old 28th July 2006, 08:45 AM   #2
Luck is offline Luck  China
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Smile front view

front view, it's made of wood.....
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Old 28th July 2006, 09:23 AM   #3
juma is offline juma  Serbia
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Great job Luck !
Try to replace that bridge with MUR860 / MUR820 / MUR840. It will give you nice improvement in upper mids and highs (the difference is most obvious there).

Keep up the good work!

Cheers !
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Old 28th July 2006, 09:29 AM   #4
Luck is offline Luck  China
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Default THANKS JUMA

Many thanks for your suggestion. i will try ....
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Old 28th July 2006, 01:13 PM   #5
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great job..impressive

i've too recenlty made some boards for the little fella

Click the image to open in full size.
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Old 29th July 2006, 02:36 AM   #6
Luck is offline Luck  China
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Smile Hi,zatramusic

Hi,zatramusic, your PCB is so small. How about the voltage of your PCB?? Here are some pictures of my ECC88+LM1875 PCB,
being soldering now. I use 20V----0----20V AC , 150W transformer for power supply. The PCB is draw by protel.Including
the time delay part when power on.
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Old 29th July 2006, 02:41 AM   #7
Luck is offline Luck  China
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Smile another picture

another picture of the PCB, the ic and relay will be soldered soon.
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Old 29th July 2006, 09:29 AM   #8
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hi Luck, i will use 2x18V 60VA per channel...
...the board is about 50x50mm and it's doublesided
..and they are made with eagle

your pcb's are far more complexed than mine..i wanted to stay minimal:
chip
8 diodes
3 resistors
2 capacitors

here's a picture
Click the image to open in full size.

and another one
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Old 30th July 2006, 03:38 AM   #9
Luck is offline Luck  China
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Default Hi,zatramusic

Hi,zatramusic, i can only see two resistors in your PCB,where is the left one? can you show me a picture including your transformer? it is suggest to put two caps with value 100nF close to LM1875.
Concerning my pcb ,it seems a little complexed. The IC that i use are : LM1875 for power output, LM7812 for the relay part, LM7806 for heating the lamp inside the tube.
Tomorrow i will finish all the soldering, then i will show you a picture....

Cheers...........
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Old 30th July 2006, 08:28 AM   #10
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Hi Luck..
I've borowed my camera yesterday :/
The third resistror is on the other side of the pcb and the caps are 1000/50v...they are less then 20mm from the chip so it's ok

i used a toroidal transformer from http://www.toroidy.pl (a polish company)

bests

zatramusic

ps..as soon as i get my camera i will post some pics
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