The Christiansen "DG" 300B Amplifier Build Thread
May 21, 2013 at 7:28 PM Thread Starter Post #1 of 655

sceleratus

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This post has been deleted because it contained the intellectual property of Neurochrome.
 
May 21, 2013 at 8:53 PM Post #2 of 655

PinkLed

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Excellent! Thanks for all the help by the way. 
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 Adding this thread to my favorites, really looking forward to seeing it finished. 
 
May 21, 2013 at 9:24 PM Post #5 of 655

nelamvr6

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Looking forward to a very interesting build.  Good luck! 
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May 22, 2013 at 10:02 PM Post #8 of 655

sceleratus

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[size=16.0pt]Today I finished ordering all the components for the Damn Fine 300B with the exception of the 300B and 6N6P valves.  There are close to 150 components.  The enclosure will be custom made and it is in the design stage.[/size]
 
[size=16.0pt]I have created a Dropbox folder to put all the schematics, BOMs, Photos, and Specs.  I will update the post as I add material.  Presently there are:[/size]
 
[size=16.0pt]·      [/size][size=16.0pt]300B Schematic parts BOMs and Photos[/size]
[size=16.0pt]·      [/size][size=16.0pt]21st Century Maida Regulator Schematic, parts BOM, and photo[/size]
[size=16.0pt]·      [/size][size=16.0pt]6.3V and 5V Filament regulator Schematic, parts BOM and photo[/size]
[size=16.0pt]·      [/size][size=16.0pt]1950 Western Electric 300B valve specification[/size]
[size=16.0pt]·      [/size][size=16.0pt]Christensen Damn Good 300B Amplifier internal and external photos [/size]
[size=16.0pt]·      [/size][size=16.0pt]List of expenses.[/size]
 
[size=16.0pt]I will close with a photo of the interior.[/size]
 
 

 
 

 
May 23, 2013 at 11:05 PM Post #9 of 655

sceleratus

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[size=16.0pt]I finished the 21st Century Maida High Voltage Regulator while waiting for the 300B boards and components to arrive. I thought I’d show some of my soldering, I rate it ok, and provide some great soldering resources for those how don’t think they can solder.[/size]
 
[size=16.0pt]First off, if I can solder, you can solder.  Despite persistent hand tremors I got it done.  First watch the Dave Jones, EEVBLOG, 3-part video on Youtube.  They are a bit long but well worthwhile esp. if you want to solder surface mount components.  Dave has even more advanced videos as well.  Who knows, you might want to hot-rod your Lyr some day.[/size]
 
[size=16.0pt]Part 1 is about The Right Gear and Solder.  This is where I learned about 0.38mm 5 core solder. That alone made it worth watching.  I also picked up a Hakko FX-888 Solder station.  This is a can’t miss tool.  Heats up quick and amazing control and tip cleaning.  An articulated desk, arm magnifier and a small Panavise is also essential.  There is also great information on solder wick and solder suckers to correct your mistakes or remove components.  I was familiar with solder suckers but did not know about solder wick....Yes this is basic.[/size]
 
[size=16.0pt]Part 2 is basic thru-hole component soldering.  I picked up more things I didn’t know.   Prior to this, when I had to solder something, it was very hit and miss.  Cold joints.[/size]
 
[size=16.0pt]Part 3 is soldering SMD components.  I never believed I could solder a component that is 1.18mm wide.  [/size]
 
 

 

 
 
Same for LM22673 Ti switching regulators.
 

 
  They have 8 feet very close together.  Simply watch Dave’s video and you can do it.  [size=16pt]Some of my work isn’t the prettiest but I had no solder bridges.  Dave shows you how to fix them anyway.  [/size]
 
[size=16.0pt]Here’s the finished product (less heat sink):[/size]
 
 
 
 

 
Filament board.  Don't laugh,  it works..  The black spots are shadows off the shiny solder...
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Here's what's on the way:
 
 

 

 
May 24, 2013 at 12:59 PM Post #10 of 655

PinkLed

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Looks great! I remember when I tried to custom make a PCB with ferric chloride, copper clad, and a sharpie. It was fun but looked very sloppy. Btw I have the same caliper. That thing is a great tool. 
 
May 24, 2013 at 1:18 PM Post #11 of 655

sceleratus

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Quote:
Looks great! I remember when I tried to custom make a PCB with ferric chloride, copper clad, and a sharpie. It was fun but looked very sloppy. Btw I have the same caliper. That thing is a great tool. 

Thanks,
I'll be making a PCB for the valve tester.  It's a parallel project, but most of my attention is on the 300B.   There are some new etching techniques that appear to be better than ferric chloride.  The name of the process escapes me now.
 
I'm using DipTrace to create the schematic (for the tester).  It produces the board trace from the schematic automatically.  I don't know that much about the circuits so I'm re-creating a few in LTspice to simulate and try to understand their function.  Again, this is more like a kit project.
 
I could not live without a set of calipers.  I have an inexpensive set that has a 1/64th fraction table.  I use those a lot.
 
May 24, 2013 at 1:48 PM Post #12 of 655

sceleratus

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I'm looking for wisdom and recommendations for 300B and 6N6P valves.
If you have any experience with these I love to read about it.
 
May 24, 2013 at 3:10 PM Post #13 of 655

sceleratus

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[size=16.0pt]I was not going to write about my plans for the enclosure but I can’t keep a secret.  I’m really stoked and I think it will look interesting.[/size]
 
[size=16.0pt]The enclosure will be wood, have an antique style, and be made from walnut, mahogany, or rosewood.  Think “Old Cigar Humidor”.  I have a good friend that has been making custom kitchen cabinets for 30 years.  [/size]
 
[size=16.0pt]I will plate the top panel, either nickel or copper.  For the controls I did some shopping on eBay …[/size]
 
 

 

 
May 25, 2013 at 1:10 AM Post #14 of 655

sceleratus

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Boards and components arrived today.  I inventoried all the components and started to work on the driver board.
8 components mounted, 65 to go.
 
 

 

 

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