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12AU7 PCB Starving Student Hybrid Amp - zammykoo Build Log - Page 4

post #46 of 58
9/26/11 at 8:31pm
Thread Starter 
Quote:
Originally Posted by the_equalizer View Post




Ah! much better. I had something similar happen to me once, a low quality, low input impedance multimeter gave readings around 20% off in a tube circuit.   Well, good to hear everything's fine and that you have voltage within parameters. 

 

So measure DC at the output and if there's none, tell us if your build plays music !!!

 

 


Yes much thanks, equalizer! I'll have to continue my mission tomorrow. If my amp isn't fried tonight, I sure am tongue.gif

 

I'll keep you guys posted. Good night!

 

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post #47 of 58
9/26/11 at 8:33pm

Yeah, I should to to bed too. Sorry, I get carried away :)   Good night !

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post #48 of 58
9/26/11 at 9:02pm

you should post a build step by step if you ever get a chance. Or you can just PM me. I still don't understand where each part goes on your board. O.o haha sorry for sucking.

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post #49 of 58
9/27/11 at 8:04am
Thread Starter 
Quote:
Originally Posted by Pingupenguins View Post

you should post a build step by step if you ever get a chance. Or you can just PM me. I still don't understand where each part goes on your board. O.o haha sorry for sucking.



Hm, since my amp is already assembled, it's not possible to do a step-by-step guide. I'll include a diagram where the components are supposed to be and the order of assembly. (Although I've basically followed Tom's guide seen HERE).

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post #50 of 58
9/27/11 at 5:27pm
Quote:
Originally Posted by zammykoo View Post





Hm, since my amp is already assembled, it's not possible to do a step-by-step guide. I'll include a diagram where the components are supposed to be and the order of assembly. (Although I've basically followed Tom's guide seen HERE).


 

Thank you very much. did  you get my wood test cuts? I messed up on the top cut today so i have to retry it.

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post #51 of 58
9/27/11 at 6:11pm
Thread Starter 
Quote:
Originally Posted by Pingupenguins View Post




 

Thank you very much. did  you get my wood test cuts? I messed up on the top cut today so i have to retry it.


Brian, here's the reference for component placement. It is on my other thread. The only other thing not mentioned is what goes on the top and bottom side. And refer to Tom's/Doug's BOM listed on their website for resistor/cap id's. (The only major difference from their BOM are my heatsinks, which are vertical 63mm)

 

Top side: FETs/heatsinks and Tubes/sockets

Bottom/Ground plane side: Everything else

 

9b5e718d_v4-all.jpeg

 

And yeah I just saw your photos, looking a bit rough around the edges but still cool. Feel free to post them here so everyone else can see.

 

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post #52 of 58
9/27/11 at 7:12pm

Did you guys finish this amp yet?How's it sound?

Did you try to change the 12au7 tube with Siemens 12au7?

 

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post #53 of 58
9/27/11 at 7:39pm

_MG_1771.jpg

 

yeh its actually a good cut. I just need to bust out some sandpaper.

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post #54 of 58
9/27/11 at 8:48pm
Thread Starter 
Quote:
Originally Posted by Tommy Thong View Post

Did you guys finish this amp yet?How's it sound?

Did you try to change the 12au7 tube with Siemens 12au7?

 



I didn't get a chance to work on my amp today cause my fiio e9 came in the mail, so got a bit sidetracked dt880smile.png

 

I don't have other tubes beside my Sylvania set.

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post #55 of 58
9/28/11 at 7:35am
Quote:
Originally Posted by zammykoo View Post




Brian, here's the reference for component placement. It is on my other thread. The only other thing not mentioned is what goes on the top and bottom side. And refer to Tom's/Doug's BOM listed on their website for resistor/cap id's. (The only major difference from their BOM are my heatsinks, which are vertical 63mm)

 

 


Okay, So you said I needed 2 extra resistors for R2 and R8? or am I mistaken? Thats where I was confused.

Thanks

 

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post #56 of 58
9/28/11 at 10:41am
Quote:
Originally Posted by Pingupenguins View Post




Okay, So you said I needed 2 extra resistors for R2 and R8? or am I mistaken? Thats where I was confused.

Thanks

 




To build a 12AU7 SSMH you need R2 and R8 = 390 K   instead of the original 19J6 SSMH BOM value of 220K.

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post #57 of 58
9/28/11 at 6:33pm

Woot thanks. made life a breeze. :)

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post #58 of 58
10/1/11 at 8:40pm

Any updates?

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