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Millett "Starving Student" hybrid amp - Page 446

post #6676 of 6802

You are going about this the wrong way, you have made a wiring mistake somewhere

 

get a copy of the schematic and a highlighter and trace everywire and connection, marking them off as you go - it's painful but it works :-)

 

cheers

FRED

post #6677 of 6802
Quote:
Originally Posted by Fred_fred2004 View Post
 

You are going about this the wrong way, you have made a wiring mistake somewhere

 

get a copy of the schematic and a highlighter and trace everywire and connection, marking them off as you go - it's painful but it works :-)

 

cheers

FRED

 

Can anyone verify that the 12au7 schematic: http://diyforums.org/SSMH/variants/SSMH-12AU7.gif is the same as this layout? http://cdn.head-fi.org/9/96/96ce0a3a_4f98a810_StripBoard_Layout_Revised.png

 

I just want to make sure as I'm rechecking everything that the issue wasn't with a misinterpretation of the wiring diagram. 

post #6678 of 6802

Use the schematic rather than a layout, they both work but the schematic is easier to trace and understand

 

cheers

FRED

post #6679 of 6802
Quote:
Originally Posted by Fred_fred2004 View Post
 

Use the schematic rather than a layout, they both work but the schematic is easier to trace and understand

 

cheers

FRED

Okay, I've been through everything twice using the highlighter and trace method stated above. I cannot find an error between what is there and what I have. Could fried out mosfets or some other messed up part account for the issues my amp is having?

Edited by jshaffe - 11/21/13 at 6:54pm
post #6680 of 6802

Its working beautifully now! My wiring was correct all the way, but I read the tip+ picture wrong so my v+ was switched with my ground in the DC jack.

post #6681 of 6802

Hi everyone!

 

I have decided to build one of these nice amps after viewing the Instructables-page of eh1080.

 

I'm wondering if anyone know or can guess how he fitted the tube sockets to the box without screws.

 

Cheers,
Jonas

post #6682 of 6802

He may have attached the sockets directly to a pcb like this http://www.head-fi.org/t/664191/starving-student-pcbs, the pcb could then be attached to the housing.....

post #6683 of 6802
Quote:
 He may have attached the sockets directly to a pcb like this http://www.head-fi.org/t/664191/starving-student-pcbs, the pcb could then be attached to the housing.....

 

Judging from this picture: http://www.instructables.com/id/Headphone-Hybrid-Tube-Amp-SSMH/step3/Time-to-wire/

 

Looks like he has soldered the tube sockets to the aluminium housing in some way. How to do it?

Maybe use epoxy glue instead?

post #6684 of 6802

 

My guess would be the combination of a very close fit and cyanoacrylate glue.

post #6685 of 6802

I am now trying to mount some screws to the inside of a case with epoxy, I will try to post pics later.....

post #6686 of 6802

so here is what I am trying to do.... mount 4 screws on the inside of the housing, this way I can remove it any time I want to....

 

however whilst taking these photos one of the screws broke off, I have glued it back on, an tomorrow I will give them all a good 'wiggle', if they break off again, I will drill holes, counter sink them and then fill over the top  of the heads of the screws...

 

I will let you know how it goes..

post #6687 of 6802
Quote:
Originally Posted by awesomebob View Post
 

so here is what I am trying to do.... mount 4 screws on the inside of the housing, this way I can remove it any time I want to....

 

 

 

however whilst taking these photos one of the screws broke off, I have glued it back on, an tomorrow I will give them all a good 'wiggle', if they break off again, I will drill holes, counter sink them and then fill over the top  of the heads of the screws...

 

I will let you know how it goes..

 

Can you not use PCB spacers? http://www.hifizine.com/files/2011/06/Stack-3.-Installing-the-PCB-spacers-on-the-miniDSP.jpg

 

they're pretty cheap.

post #6688 of 6802
Quote:
Originally Posted by jshaffe View Post
 

 

Can you not use PCB spacers? http://www.hifizine.com/files/2011/06/Stack-3.-Installing-the-PCB-spacers-on-the-miniDSP.jpg

 

they're pretty cheap.


they would be good, I'll see if I can find some this weekend... cheers!

post #6689 of 6802

radioshack sells them

post #6690 of 6802

Thats a bit far for me, I live in Italy! But the glue seems to have held, and I can set the distance of the pcb from case by adjusting the nuts, so it seems ok.... But I wish we had radioshack here.....

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