[Kryte]

I've been reading various threads on this site about diy amps and want to eventually build myself a nice desktop tube amp.
 
So I figured since I know nothing about reading schematics and my only soldering experience is from repairing usb cables that a good way to start out would be to buy a breadboard and build it on that.
 
After I finished building the power supply I tested it per tangents website suggestion and got 4.5v from both test spots so I proceeded with the rest of the build. I used all his recommended components with the exception that I forgot to buy the 9v battery clip, one of the stereo jacks disappeared on me, and changed the gain with I think it was a 2k resistor so from 11 to 6.
 
So with the amp "finished" I plugged in my Ipod to input and my old HD202's to the out. I can hear music but it is very low out of both channels with some crackling and after turning up the volume the crackling gets louder and worse.
 
I have looked over the way I put it together and can't seem to find out what I did wrong although its probably something really obvious as this is the first time I've undertaken a project like this.
 
I just now checked the v+ its 1.968v v- is 7.04 not sure if that sounds right after the build is finished. As for the right output I get .65v and for the left out I get .631v
 
Photos:
 

 

 

 

 

 

 

 
Any help or suggestions are really appreciated, this noob is trying to learn.

 

 

[tomb]

You need to edit your post.
 
The only way you can imbed image tags is by using the full HTML tag format with the editor window in the "source" mode.  Like this - <img src="image-link.jpg">  Or, you can use the "Insert Image" icon in the WYSWYG editor window, but note that you will be uploading your images to Head-Fi in that case and some of us would rather have a bit more control than that.

 
I'm afraid your direct links don't work, either.

 

[Kryte]

Quote:

You need to edit your post.
 
The only way you can imbed image tags is by using the full HTML tag format with the editor window in the "source" mode.  Like this - <img src="image-link.jpg">  Or, you can use the "Insert Image" icon in the WYSWYG editor window, but note that you will be uploading your images to Head-Fi in that case and some of us would rather have a bit more control than that.

 
I'm afraid your direct links don't work, either.

Thanks, should be up now.

 

 

[Avro_Arrow]

Breadboards like that are nasty things to build a high frequency audio circuit on.
It is probably oscillating.
All those long leads on the components act like antennas.
 
You should get rid of the Breadboard in favor of a strip board.
Something like what Tangent used in his tutorial or like Fred_Freds
linked here:
http://www.head-fi.org/t/460669/strip-board-cmoy-revisited

 

[w62820616]

Use the power rail of your breadboard for power for V+ and V-, leave the ground along on one row.

 

[Kryte]

Quote:

Breadboards like that are nasty things to build a high frequency audio circuit on.
It is probably oscillating.
All those long leads on the components act like antennas.
 
You should get rid of the Breadboard in favor of a strip board.
Something like what Tangent used in his tutorial or like Fred_Freds
linked here:
http://www.head-fi.org/t/460669/strip-board-cmoy-revisited

Ah, Ok. The purpose of the breadboard was just so I could get a better understanding of the circuit and after that I was going to go ahead and use the Radioshack protoboard recommended on Tangent's guide. So I should take it as a good sign that I'm getting sound out of both channels and go ahead and solder the components to the protoboard?
 

 

[Avro_Arrow]

It is definitely more likely to work on a better
board.

 

[Kryte]

Quote:

It is definitely more likely to work on a better
board.

Thanks again. I won't get a chance to solder the components until tomorrow morning.
 
I'll be sure to post a couple of photos of the finished board tomorrow.

 
 
Edit:
 
Only had enough time today to put it together to where I can check to see if it works properly, didn't have enough alligator clips, and it did.
 
Next weekend I'll add the potentiometer, switch, stick into some sort of case then decide on what my next project should be.