Marantz 2245/2270 P750 Amp Board Replica
- Thread starter ton4eff
- Start date
You are just rocking along with this.
Took only 8 hours... Vectorizing with a mouse is difficult. Have to buy a graphic tablet, should be faster and easier...
ton4eff
Active Member
Let it be soldered. Let it be hard-core! 
The spacing between the pins is 7.3mm. I'm doing it as closer to the original as possible (to the pdf at least). I'll consider some eventual changes, due to the unobtainable parts etc. when I get the job done and all layers are finished.
The spacing between the pins is 7.3mm. I'm doing it as closer to the original as possible (to the pdf at least). I'll consider some eventual changes, due to the unobtainable parts etc. when I get the job done and all layers are finished.
ton4eff
Active Member
Silkscreen, holes and bottom copper layers almost finished. Solder mask will be the last step. Here is the picture of the latest version. Added an extra hole for a smaller C751 cap, I'll think if it will stay in the final version. By the way for a future reference the "Pathway Gothic One" font works best for the part number of the PCB - looks closer to the original... 
Let me know if you notice any discrepancies against the Mike's earlier published scanned board . I'll also double check with the schematic if everything matches...
Let me know if you notice any discrepancies against the Mike's earlier published scanned board . I'll also double check with the schematic if everything matches...
Steven Tate
CEO Flat Forehead Soc.
Awesome work! My dad was an EE who was always building electronic stuff in the 50’s and 60’s. I remember him making printed circuit boards with a photosensitive process. He would draw it out in black and white, make a high contrast negative, paint the copper surface with a photosensitive material, place the negative over it, expose it to an arc welder light, and place in an acid bath that would only eat up the exposed metal. That made a pretty good looking PCB. Very archaic by today’s standards, but interesting to have seen where all of this came from.
You are rocking this effort!!!
ton4eff
Active Member
@Steven Tate, of course the board will work just fine with modern 45/90deg "sterile" traces. I just like the vintage look of the curved tracks. They were drawn by hand at the time and I draw them by hand too, just using a computer instead of a real paper. And it's very difficult, because modern PCB editors doesn't support this feature at all... Guess who's expecting a graphical tablet for easier drawing to arrive today...
p.s. And they use photoresist method in the PCB factories even today AFAIK... This is an interesting video about the current day technology:
p.s. And they use photoresist method in the PCB factories even today AFAIK... This is an interesting video about the current day technology:
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Hi Ton4eff, I checked the silk screens and as far as I can see, everything is good.
The "Pathway Gothic One" font is certainly a pretty close match to the original -
BUT the original number on the scan shows YD2819009-0 - but you have an 8 instead of 9.
And the AP16 in the middle - you changed to 2018...
The "Pathway Gothic One" font is certainly a pretty close match to the original -
BUT the original number on the scan shows YD2819009-0 - but you have an 8 instead of 9.
And the AP16 in the middle - you changed to 2018...
ton4eff
Active Member
That number was from the pdf... I'll correct the writings later. These scans did a pretty nice job actually, thanks to Mike. As it goes, the gerber files will be ready until the real board arrives. I didn't find any picture online for the revised version however. No problem for the copper layer, but I don't have the silkscreen and I have to improvise with those... We'll see...
Steven Tate
CEO Flat Forehead Soc.
@ton4eff, very interesting video. Looks like they use an ultra-modernized version of the same process my dad used 50 years ago. I’m really impressed with your duplication of the shapes on the original board. I’m sure that tablet will make it much easier. I’m really enjoying seeing your progress.
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