the last thing you did was the amp board?
was there any magic smoke/and or strange noises or do you think the fuse just went?
Check your work on the amp board, all transistors ECB are they correct.
Also it may be the trimmers you put in or the settings:
I think you did DC offset @midpoint
And the bias you turned all the way in one direction?
Yes, The Amp Board was the last one..
Ok, I found some issues. I can't believe how I did this either..
Somehow I got transistors mixed up from Q5 to Q10.
Here's what I found:
I put KSC3503DSTU in Q7 & Q8. Should have been KSC2690AYS.
I put KSC2690AYS in Q5 & Q6. Should have been KSC3503DSTU.
I put KSC2690AYS in Q9 & Q10. Should have been KSA1220AYS.
All these have now been corrected.
By the way, there was no magic smoke or strange noises when I powered it up prior to this. The fuse blew immediately after the protection relay clicked.
I also checked the output transistors for any shorts. All checked ok. I followed a reliable test procedure i found on you tube.
http://www.youtube.com/watch?v=REW2lF0sb74
All transistors are correct in terms of pin placement. The TO-126 are all ECB.
Pin 1 being the 1st on left on the printed side.
As for the trimmers, I do recall setting these after pulling them from the board to the correct spec, then re soldering them in. The pin placement on these I am sure are correct, but feel free to scrutinize these from the pics provided previously, and data sheets from the links below for each.
VR 1, VR 2 (4.7K): 652-3296P-1-502LF
http://au.mouser.com/ProductDetail/...=sGAEpiMZZMvygUB3GLcD7n4W/LGLppVQAt4Gicko0hk=
VR 3, VR 4 (100ohm): 652-3386H-1-101LF
http://au.mouser.com/ProductDetail/...=sGAEpiMZZMvygUB3GLcD7rufck0TIBKy/8deGTAIvjY=
I'll await further instructions.
Thanks for your patience.