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irvynejay 5th November 2011 09:47 AM

Vertex Amp By apexaudio
3 Attachment(s)
After some several test and adjustment for how many months to make this Diy amp i will share to all diyers with the permission and support of apexaudio
Who ever want to make the amp or edit/modify the layout is free to do what ever he/she want...
I will only share what i learn on this diy amp,,(I'm not a PRO)
There is no Schematic i only use or base on original schematic of cr@@t and vertex shared by apex

Some changes was made during test
test voltage only at 60/120 -/+
i only use 2sc5200/2sa1943 for test
Amp i made only 2 stepper
final power transistor should be mjl4281/4302 or mjl21195/21196 Or 2sc4029/2sa1553
2 mje15034 replace mje13007
2 mje15035 replace mje5851 or 5852
mje transistor should be mounted on main heat sink,, i don't have the time to reedit the pcb,,(Looking forward to the new Project)
zobel network from 103/250v/4.7r replace 473/250v/ 4.7r 5w
BC550/560 replace 2n3906/3904
Dc servo ic Is LF411

added balance -/+ input with sensitivity switch

link of schematic used:
Download crest.rar from - send big files the easy way

apexaudio 5th November 2011 10:19 AM

Nice work, would you share some measurements?

irvynejay 5th November 2011 10:22 AM

yes mile when i get home ill post all te measurement i made also the files of this amp

engel dela pena 5th November 2011 10:31 AM


irvynejay 5th November 2011 11:06 AM

offset .3mv .,, voltage across .22 5w resistors 10mv idle
1.2vac 50hz sine wave on input and output 85vac reading ,,clip at 85vac 4r 1000w speaker load

engel dela pena 5th November 2011 11:07 AM

what would be the power supply requirement for this beast amp?

irvynejay 5th November 2011 11:28 AM

Vertex files
3 Attachment(s)
2 step 75/140 -/+ with MJL 4281/4302 or MJL21196/95 but mile can clarify it for sure

buttercup1108 5th November 2011 12:49 PM

what is the size of this pcb sir irvynejay

engel dela pena 5th November 2011 01:16 PM

325mm x 83mm

irvynejay 5th November 2011 01:19 PM

files link large one and clear

Download final.rar from - send big files the easy way

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